Tue·Oct 12, 2021Tuesday·October 12, 2021

1. 01*

   Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions

   Saurabh Bansal🇺🇸 · Jeong Han Kim🇰🇷 · Christopher Kolda🇺🇸 · Matthew Low🇺🇸 · Yuhsin Tsai🇺🇸

   The mirror twin Higgs model (MTH) is a solution to the Higgs hierarchy problem that provides well-predicted cosmological signatures with only three extra parameters: the temperature of the twin sector, the abundance of twin baryons, and the vacuum expectation value (VEV) of twin electroweak symmetry breaking. These parameters specify the behavior of twin radiation and the acoustic oscillations of twin baryons, which lead to testable effects on the cosmic microwave background (CMB) and large-scale structure (LSS). While collider searches can only probe the twin VEV, through a fit to cosmological data we show that the existing CMB (Planck18 TTTEEE+lowE+lowT+lensing) and LSS (KV450) data already provide useful constraints on the remaining MTH parameters. Additionally, we show that the presence of twin radiation in this model can raise the Hubble constant $H_0$ while the scattering twin baryons can reduce the matter fluctuations $S_8$, which helps to relax the observed $H_0$ and $S_8$ tensions simultaneously. This scenario is different from the typical $\Lambda$CDM + $\Delta N_{\mathrm{eff}}$ model, in which extra radiation helps with the Hubble tension but worsens the $S_8$ tension. For instance, when including the SH0ES and Planck SZ data in the fit, we find that a universe with $\gtrsim 20\%$ of the dark matter comprised of twin baryons is preferred over $\Lambda$CDM by $\sim 4\sigma$. If the twin sector is indeed responsible for resolving the $H_0$ and $S_8$ tensions, future measurements from the Euclid satellite and CMB Stage 4 experiment will further measure the twin parameters to $O(1-10\%)$-level precision. Our study demonstrates how models with hidden naturalness can potentially be probed using precision cosmological data.

   hep-phastro-ph.COJHEP(2022)·67 citations
2. 02*

   Comparison with experimental data of different theoretical approaches to high-energy electron bremsstrahlung including quantum coherence effects

   A. Mangiarotti🇵🇹 · P. Sona🇮🇹 · U. I. Uggerhøj🇩🇰

   The basic expressions for the differential nuclear bremsstrahlung cross section at high electron energy, as derived under different theoretical approaches and approximations to quantum coherence effects, are compared. The Baier-Katkov treatment is reformulated to allow introduction of the same value of the radiation length in all calculations. A dedicated Monte Carlo code is employed for obtaining photon energy spectra in the framework of the Baier-Katkov approach taking into account multiphoton emission, attenuation by pair production, and pile-up with photons from the background. The results of Monte Carlo simulations for both the Migdal and Baier-Katkov descriptions are compared to all available data that show the Landau-Pomeranchuk-Migdal suppression. The issue of the sensitivity of the experiments to the difference of the two approaches is investigated.

   hep-phPRD(2021)·1 citation
3. 03*

   A pedagogical review on muon $g-2$

   Song Li🇨🇳 · Yang Xiao🇨🇳 · Jin Min Yang🇨🇳

   This note is a pedagogical mini review on the muon anomalous magnetic moment ($g-2$), translated and adapted from our article published in Modern Physics 4 (2021) 40-47. The contents include: (i) The magnetic moment of an electric-current coil; (ii) The magnetic moment of a charged lepton estimated as a classical charged ball with spin; (iii) The magnetic moment of a charged lepton from Dirac equation with electromagnetic interaction; (iv) The $g-2$ of a charged lepton from QED beyond tree level with effective couplings; (v) The measurement of muon $g-2$; (vi) The muon $g-2$ in low energy supersymmetric models. Finally, we give an outlook.

   hep-phhep-exMod.Phys.(2021)·6 citations
4. 04*

   The dark matter: DAMA/LIBRA and its perspectives

   R. Bernabei (1)🇮🇹 · P. Belli (1)🇮🇹 · V. Caracciolo (1)🇮🇹 · R. Cerulli (1)🇮🇹 · V. Merlo (1)🇮🇹 · F. Cappella (2)🇮🇹 · A. d'Angelo (2)🇮🇹 · A. Incicchitti (2)🇮🇹 · C.J. Dai (3)🇨🇳 · X.H. Ma (3)🇨🇳 · X.D. Sheng (3)🇨🇳 · F. Montecchia (1,4)🇮🇹 · Z.P. Ye (3,5) ((1) Univ. Roma Tor Vergata and INFN Roma Tor Vergata, (2) Univ. Roma and INFN Roma, (3) IHEP CAS Beijing, (4) Univ. Tor Vergata, (5) Univ. Jinggangshan)🇨🇳

   Experimental observations and theoretical arguments point out that Dark Matter (DM) particles are one of the most prominent component of the Universe. This motivated the pioneer DAMA experiment to investigate the presence of these particles in the galactic halo, by exploiting the model independent signature of the DM annual modulation of the rate and very highly radio-pure apparatus in underground site. In this paper the results obtained by other two annual cycles of DAMA/LIBRA-phase2 are presented and the long-standing model-independent annual modulation effect measured by DAMA deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. with different experimental configurations is summarized. The improved experimental configuration of DAMA/LIBRA-phase2, $\simeq$ 250 kg highly radio-pure NaI(Tl), allowed to lower the software energy threshold. The total exposure of DAMA/LIBRA-phase2 over 8 annual cycles is 1.53 ton $\times$ yr. DAMA/LIBRA-phase2 confirms the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at 11.8 $\sigma$ C.L. in the energy region (1-6) keV. In the energy region between 2 and 6 keV, where data are also available from DAMA/NaI and DAMA/LIBRA-phase1 (2.86 ton $\times$ yr), the achieved C.L. is 13.7 $\sigma$; the modulation amplitude of the single-hit scintillation events is: $(0.01014\pm 0.00074)$ cpd/kg/keV, the measured phase is $(142.4\pm 4.2)$ days and the measured period is $(0.99834\pm 0.00067)$ yr, all these values are well in agreement with those expected for DM particles. No systematics or side reaction able to mimic the exploited DM signature (i.e. to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature), has been found or suggested by anyone throughout some decades thus far.

   hep-phastro-ph.COhep-exphysics.ins-det34 citations
5. 05*

   Searching for strange hidden-charm pentaquark state $P_{cs}(4459)$ in $\gamma p\to K^{+}{P}_{cs}(4459)$ reaction

   Cai Cheng🇨🇳 · Feng Yang🇨🇳 · Yin Huang🇨🇳

   We investigate the possibility of studying the strange hidden-charm pentaquark state $P_{cs}(4459)$ by photon-induced reactions on a proton target in an effective Lagrangian approach. The production process is described by the $t$-channel $K^{-}$ exchange, the $u$-channel $\Lambda$ exchange, the contract term, and the $s$- channel nucleon pole. Our theoretical approach is based on the assumption that $P_{cs}(4459)$ with $J^P=1/2^{-}$ or $J^P=3/2^{-}$ can be interpreted as a molecule composed of ${\bar{D}}^{\ast }{\Xi }_c$. Using the coupling constants of the $P_{cs}^{J^P}$ to $\gamma \Lambda$ and $K^{-}p$ channels obtained from molecule picture of the $P_{cs}^{J^P}(4459)$, the total cross-sections of the process $\gamma p\to P_{cs}^{J^P}{K}^{+}$ is evaluated. Our calculation indicates that the cross-section for $\gamma p\to P_{cs}^{1/2^{-}}{K}^{+}$ and $\gamma p\to P_{cs}^{3/2^{-}}{K}^{+}$ are of the order of 10.0 pb and 5.0 pb, respectively. In addition, we compute the cross-section by assuming $P_{cs}(4459)$ as a compact pentaquark and find it is quite different from the results of ${\bar{D}}^{\ast }{\Xi }_c$ molecule. Those results can be measured in future experiments, such as the Electron-Ion Collider in China and the United States. And can be used to test the nature of the $P_{cs}$.

   hep-phnucl-thPRD(2021)·21 citations
6. 06*

   System evolution of forward-backward multiplicity correlations in a multi-phase transport model

   Yi-An Li🇨🇳 · Dong-Fang Wang🇨🇳 · Song Zhang🇨🇳 · Yu-Gang Ma🇨🇳

   The initial geometry effect on forward-backward multiplicity correlations $C(N_f,N_b)$ is studied in relativistic collisions between light nuclei by using a multiphase transport model (AMPT). It is found that tetrahedron ${}^{16}$O + ${}^{16}$O gives a more uniform and symmetrical fireball which produces a more isotropic distribution of final particles after the expansion and evolution, and leads to a small $C(N_f,N_b)$. Forward-backward multiplicity correlation could be taken as a useful probe to distinguish the pattern of $\alpha$-clustered ${}^{16}$O in experiments by comparing the neighboring colliding nuclear systems like ${}^{14}$N + ${}^{14}$N and ${}^{19}$F + ${}^{19}$F.

   hep-phnucl-exnucl-thPRC(2021)·17 citations
7. 07*

   Automation of Beam and Jet functions at NNLO

   Guido Bell🇩🇪 · Kevin Brune🇩🇪 · Goutam Das🇩🇪 · Marcel Wald🇩🇪

   We present a novel framework to streamline the calculation of jet and beam functions to next-to-next-to-leading order (NNLO) in perturbation theory. By exploiting the infrared behaviour of the collinear splitting functions, we factorise the singularities with suitable phase-space parametrisations and perform the observable-dependent integrations numerically. We have implemented our approach in the publicly available code {\tt pySecDec} and present first results for sample jet and beam functions.

   hep-phSciPost Phys.Proc.(2022)·19 citations
8. 08*

   New Light $H^{\pm }$ Discovery Channels at the LHC

   Abdesslam Arhrib🇲🇦 · Rachid Benbrik🇲🇦 · Mohamed Krab🇲🇦 · Bouzid Manaut🇲🇦 · Stefano Moretti🇬🇧 · Yan Wang🇨🇳 · Qi-Shu Yan🇨🇳

   A light charged Higgs boson has been searched for at the Large Hadron Collider (LHC) via top (anti)quark decay, i.e., $t\to b{H}^{+}$, if kinematically allowed. In this contribution, we propose new channels for light charged Higgs boson searches via the pair productions $pp\to H^{\pm }h/A$ and $pp\to H^{+}{H}^{-}$ at the LHC in the context of the Two-Higgs Doublet Model (2HDM) Type-I. By focusing on a case where the heavy H state is the Standard Model (SM)-like one already observed, we investigate the production of the aforementioned charged Higgs bosons and their bosonic decay channels, namely, $H^{\pm }\to W^{\pm }h$ and/or $H^{\pm }\to W^{\pm }A$. We demonstrate that such production and decay channels can yield substantial alternative discovery channels for $H^{\pm }$ bosons at the LHC. Finally, we propose eight benchmark points (BPs) to motivate the search for such signatures.

   hep-phSymmetry(2021)·13 citations
9. 09*

   Nuclear matter effects on jet production at electron-ion colliders

   Hai Tao Li🇺🇸 · Ze Long Liu🇺🇸 · Ivan Vitev🇺🇸

   In these proceedings we report recent progress on understanding hadron and jet production in electron-nucleus collisions at the future Electron-Ion Collider [1,2]. These processes will play an essential role in the exploration of the partonic structure of nuclei and the study of parton shower evolution in strongly-interacting matter. We employ the framework of soft-collinear effective theory, generalized to include in-medium interactions, to present the first theoretical results for inclusive hadron and jet cross sections, as well as the jet charge modification in deep inelastic scattering on nuclei. We further demonstrate how to separate initial-state and final-state effects.

   hep-phnucl-thSciPost Phys.Proc.(2022)·2 citations
10. 10*

    Mass spectra and strong decays of charmed and charmed-strange mesons

    Ru-Hui Ni🇨🇳 · Qi Li🇨🇳 · Xian-Hui Zhong🇨🇳

    A semi-relativistic potential model is adopted to calculate the mass spectra of charmed and charmed-strange meson states up to the $2D$ excitations.The strong decay properties are further analyzed with a chiral quark model by using the numerical wave functions obtained from the potential model. By using the strong decay amplitudes extracted from the chiral quark model, we also systematically study the coupled-channel effects on the bare masses of the $1P$-wave states, since the masses of $D_{s0}^{\ast }(2317)$ and $D_{s1}(2460)$ cannot be explained with bare $1P$-wave states within the potential model. Based on our good descriptions of the mass and decay properties for the low-lying well-established states, we give a quark model classification for the high mass resonances observed in recent years. In the $D$-meson family, $D_0(2550)$ can be classified as the radially excited state $D(2^1{S}_0)$; $D_3^{\ast }(2750)$ and $D_2(2740)$ can be classified as the second orbital excitations $D(1^3{D}_3)$ and $D(1D_2^{\prime })$, respectively; $D_J^{\ast }(3000)$ may be a candidate of $D(1^3{F}_4)$ or $D(2^3{P}_2)$; while $D_J(3000)$ may favor the high mass mixed state $D(2P_1^{\prime })$; however, there still exist puzzles for understanding the natures of $D_1^{\ast }(2600)$ and $D_1^{\ast }(2760)$, whose decay properties cannot be well explained with either pure $D(2^3{S}_1)$ and $D(1^3{D}_1)$ states or their mixing. In the $D_s$-meson family, $D_{s3}^{\ast }(2860)$ favors the $D_s(1^3{D}_3)$ assignment; $D_{s1}^{\ast }(2700)$ and $D_{s1}^{\ast }(2860)$ may favor the mixed states $|(SD{)}_1{⟩}_L$ and $|(SD{)}_1{⟩}_H$ via the $2^3{S}_1$-$1^3{D}_1$ mixing, respectively; $D_{sJ}(3040)$ may favor $D_s(2P_1)$ or $D_s(2P_1^{\prime })$, or corresponds to a structure contributed by both $D_s(2P_1)$ and $D_s(2P_1^{\prime })$.

    hep-phhep-exPRD(2022)·52 citations
11. 11*

    Annual modulations of the angular recoil-flux/energy distributions of WIMP-scattered target nuclei observed at an underground laboratory

    Chung-Lin Shan🇹🇼

    In this article, we compare the target and WIMP-mass dependent "annual modulations" of the angular distributions of the recoil flux and energy of WIMP-scattered target nuclei observed at different underground laboratories. For readers' reference, simulation plots with different WIMP masses and frequently used target nuclei for all functionable underground laboratories can be found and downloaded on our online (interactive) demonstration webpage (http://www.tir.tw/phys/hep/dm/amidas-2d/).

    hep-phastro-ph.HEJ.Phys.Conf.Ser.(2021)·2 citations
12. 12*

    Generalized parton distributions and spin structures of light mesons from a light-front Hamiltonian approach

    Lekha Adhikari🇺🇸 · Chandan Mondal🇨🇳 · Sreeraj Nair🇨🇳 · Siqi Xu🇨🇳 · Shaoyang Jia🇺🇸 · Xingbo Zhao🇨🇳 · James P. Vary🇺🇸

    We present the generalized parton distributions (GPDs) for the valence quarks of the pion and the kaon in both momentum space and position space within the basis light-front quantization framework. These GPDs are obtained from the eigenvectors of a light-front effective Hamiltonian consisting of the holographic quantum chromodynamics (QCD) confinement potential, a complementary longitudinal confinement potential, and the color-singlet Nambu-Jona--Lasinio interactions for the valence quarks of mesons. We then calculate the generalized form factors of the pion and the kaon from the moments of these GPDs. Combining the tensor form factors with the electromagnetic form factors, we subsequently evaluate the impact parameter dependent probability density of transversely polarized quarks inside the pion and the kaon. The numerical results for the generalized form factors, tensor charges, as well as those for the probability densities and the transverse shift of the polarized densities are consistent with lattice QCD simulations and with chiral quark models.

    hep-phnucl-thPRD(2021)·41 citations
13. 13*

    Probing texture 4 zero quark mass matrices in the era of precision measurements

    Aakriti Bagai🇮🇳 · Aseem Vashisht🇮🇳 · Nikhila Awasthi🇮🇳 · Gulsheen Ahuja🇮🇳 · Manmohan Gupta🇮🇳

    In pursuance of finding a viable set of mass matrices, keeping in mind recent precision measurement of quark masses and CKM parameters, we have carried out a detailed and comprehensive analysis of hermitian texture 4 zero quark mass matrices. Our analysis reveals that only Fritzsch like texture 4 zero combination provides a viable set of mass matrices for the present quark mixing data and all other texture 4 zero combinations are ruled out. A good number of these possibilities can be ruled out analytically, the other possibilities are excluded by the present quark mixing data. Interestingly, our conclusions remain valid, even if in future there are perturbations in the ranges of the light quark masses or CKM parameters.

    hep-ph5 citations
14. 14*

    Dark photon bursts from compact binary systems and constraints

    Shaoqi Hou🇨🇳 · Shuxun Tian🇨🇳 · Shuo Cao🇨🇳 · Zong-Hong Zhu🇨🇳

    In this work, we consider the burst signal of the dark photon, the hypothetical vector boson of the $U(1{)}_B$ or $U(1{)}_{B-L}$ gauge group, generated by a compact binary star system. The absence of the signal in the laser interferometer puts bounds on the coupling constant $ϵ$ to the ordinary matter. It turns out that if the dark photon is massless, ${ϵ}^2$ is on the order of $10^{-37}-10^{-33}$ at most; in the massive case, the upper bound of ${ϵ}^2$ is about $10^{-38}-10^{-31}$ in the mass range from $10^{-19}$ eV to $10^{-11}$ eV. These are the first bounds derived from the interferometer observations independent of the assumption of dark photons being dark matter.

    hep-phgr-qchep-thPRD(2022)·11 citations
15. 15*

    W+c-jet production at the LHC with NNLO QCD accuracy

    Michal Czakon🇩🇪 · Alexander Mitov🇬🇧 · Mathieu Pellen🇩🇪 · Rene Poncelet🇬🇧

    In these proceedings, we highlight some aspects of the recent computation of NNLO QCD corrections for W production in association with a charm jet at the LHC. The results are presented in the form of cross sections and differential distributions and are compared to ATLAS data.

    hep-phhep-exSciPost Phys.Proc.(2022)·2 citations
16. 16*

    Probing the Gluon Plasma with Charm Balance Functions

    Sumit Basu🇸🇪 · Peter Christiansen🇸🇪 · Alice Ohlson🇸🇪 · David Silvermyr🇸🇪

    Recent theoretical explanations for how hydrodynamic-like flow can build up quickly in small collision systems (hydrodynamization) has led to a microscopic picture of flow building up in a gluon-dominated phase before chemical equilibrium between quarks and gluons has been attained. The goal of this contribution to Offshell-2021 is to explore consequence of assuming a long-lived gluon-dominated phase, which we shall denote a gluon plasma (GP). As these consequences are naturally enhanced in a large systems, we assume and explore the extreme scenario in which a GP would be created in AA collisions and exist for significant time before the formation of a chemically-equilibrated quark-gluon plasma (QGP). The GP and its formation would be impossible to probe with light-quark hadrons, which are first produced later in this scenario. As charm quarks are produced early in the collision, they can circumvent the limitations of light quarks and we propose charm balance functions as an effective tool to test this idea and constrain the dynamics of the GP.

    hep-phhep-exnucl-exEPJC(2021)·4 citations
17. 17*

    PMC${}_{\infty }$: Infinite-Order Scale-Setting method using the Principle of Maximum Conformality and preserving the Intrinsic Conformality

    Leonardo Di Giustino🇮🇹 · Stanley J. Brodsky🇺🇸 · Xing-Gang Wu🇨🇳 · Sheng-Quan Wang🇨🇳

    We show results for Thrust and C-parameter in $e^{+}{e}^{-}$ annihilation to 3 jets obtained using the recently developed new method for eliminating the scale ambiguity and the scheme dependence in pQCD namely the Infinite-Order Scale-Setting method using the Principle of Maximum Conformality (PMC${}_{\infty }$). This method preserves an important underlying property of gauge theories: intrinsic Conformality (iCF). It leads to a remarkably efficient method to eliminate the conventional renormalization scale ambiguity at any order in pQCD. A comparison with Conventional Scale Setting method (CSS) is also shown.

    hep-phhep-thSciPost Phys.Proc.(2022)·0 citations
18. 18*

    Next-to-leading power SCET in Higgs amplitudes induced by light quarks

    Xing Wang🇩🇪

    In this article, we report how to use the "plus-type" subtraction scheme to deal with endpoint divergences in $h\to \gamma \gamma$ or $gg\to h$ amplitudes induced by light quark loop, which can be formulated by next-to-leading power (NLP) SCET. This subtraction is ensured by two re-factorization conditions, which have been proven to all orders in ${\alpha }_s$. Based on these conditions, cutoffs emerge naturally after some re-arrangements to handle endpoint divergences and renormalization is compatible with that. Our formalism can analytically reproduce three-loop amplitudes up to ${\ln }^3(-M_h^2/m_b^2-i0)$ and resum to next-to-leading logarithm and beyond.

    hep-phSciPost Phys.Proc.(2022)·3 citations
19. 19*

    $\eta (1295)\to 3\pi$ decays

    N.N. Achasov🇷🇺 · G.N. Shestakov🇷🇺

    The radially excited pseudoscalar state $\eta (1295)$ is still poorly understood [as well as its $SU(3)$ partners $\pi (1300)$ and $K(1460)$] and we want to attract attention experimenters to its comprehensive study. As for the main three-body decay $\eta (1295)\to \eta \pi \pi$, here the main interest is the measurements of the shapes of the $\eta \pi$ and $\pi \pi$ mass spectra in which the contributions from the $a_0(980)$ resonance and the large $\pi \pi$ $S$ wave ($\sigma$) should manifest themselves. To describe these mass spectra, we propose to use a simple isobar model with a single fitting parameter characterizing the relative intensity of the $a_0(980)$ and $\sigma$ state production. Our main goal is to discuss the dynamics of the isospin-breaking decays $\eta (1295)\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta (1295)\to 3{\pi }^0$, whose experimental studies could continue the impressive story of isospin violations in the decays of light isoscalar mesons $\omega \to 2\pi$, $\eta \to 3\pi$, ${\eta }^{\prime }\to 3\pi$, $\eta (1405)\to 3\pi$, and $f_1(1285)\to 3\pi$. We estimate the widths of the isospin-breaking decays $\eta (1295)\to 3\pi$ produced via the mixing of the ${\pi }^0-\eta$ and $a_0^0(980)-f_0(980)$ states and also due to the ${\pi }^0(1300)-\eta (1295)$ mixing. Processes that have the potential for detecting $\eta (1295)\to 3\pi$ decays are discussed.

    hep-phhep-exnucl-thPRD(2021)·2 citations
20. 20*

    The Two-Loop Radiative Gluon Jet Function for $gg\to h$ via a Light Quark Loop

    Marvin Schnubel🇩🇪

    The Higgs-boson production channel $gg\to h$ mediated by light-quark loops receives large logarithmic corrections in QCD, which can be resummed using factorization formulae derived in soft-collinear effective theory. In these factorization formulae the radiative gluon jet function appears, which is a central object in the study of factorization beyond the leading order in scale ratios. We calculate this function at two-loop order for the first time and present the subtleties that come along with this.

    hep-phSciPost Phys.Proc.(2022)·1 citation
21. 21*

    Effects of order ${\alpha }^3$ on the determination of the Pauli form factor $F_2$ of the $\tau$-lepton

    Norbert Kaiser🇩🇪 · Fabian Krinner🇩🇪

    We introduce optimal observables to measure the Pauli form factor $F_2$ of the $\tau$-lepton in the pair-production process $e^{-}{e}^{+}\to {\tau }^{-}{\tau }^{+}$ from the intensity distribution of the decay products. The spin-density matrix for the production process is calculated in QED up to order ${\alpha }^3$ including virtual photon-loops and soft bremsstrahlung, as well the $\gamma Z^0$ interference. We find that the decay channel $({\rho }^{-}{\nu }_{\tau })\times ({\rho }^{+}{\bar{\nu }}_{\tau })$ yields the best resolution for Re$F_2(s)$ and Im$F_2(s)$ due to its high branching fraction. We also study the bias that is introduced in the determination of $F_2$ , if the production spin-density matrix is taken in tree-level (one-photon exchange) approximation.

    hep-phEPJC(2022)·5 citations
22. 22*

    Scalar resonances in the final state interactions of the decays $D^0\to {\pi }^0{\pi }^0{\pi }^0,{\pi }^0{\pi }^0\eta ,{\pi }^0\eta \eta$

    Zhong-Yu Wang🇨🇳 · Hiwa A. Ahmed🇨🇳 · C. W. Xiao🇨🇳

    We investigate the scalar resonances in the processes of $D^0\to {\pi }^0{\pi }^0{\pi }^0,{\pi }^0{\pi }^0\eta ,{\pi }^0\eta \eta$ decays based on the chiral unitary approach for the final state interaction. We start from singly Cabibbo-suppressed production diagrams which provide a primary quark pair to hadronize two pseudoscalar mesons in $D^0$ decays. The resonances $f_0(500)$, $f_0(980)$ and $a_0(980)$ are dynamically produced from the final state interactions of the meson pairs. In our results, the experimental data for the ${\pi }^0\eta$ invariant mass spectrum of the $D^0\to {\pi }^0\eta \eta$ decay can be described well. We also make the predictions for the ${\pi }^0{\pi }^0$ invariant mass spectrum of the $D^0\to {\pi }^0{\pi }^0{\pi }^0$, where the $f_0(980)$ can be found, and for the ${\pi }^0{\pi }^0$, ${\pi }^0\eta$ invariant mass spectrum of the $D^0\to {\pi }^0{\pi }^0\eta$, where the $f_0(500)$, $f_0(980)$ and $a_0(980)$ appear. Furthermore, the branching ratios of each decay channel are predicted. We expect more accurate measurements of these decays to better understand the nature of the states $f_0(500)$, $f_0(980)$ and $a_0(980)$.

    hep-phPRD(2022)·12 citations
23. 23*

    Asymmetry in flavour changing electromagnetic transitions of vector-like quarks

    Shyam Balaji🇫🇷

    Vector-like quarks have been of interest for a plethora of experimentally motivated reasons and have come under increased investigation recently due to their inclusion to the Standard Model (SM) appreciably improving global fits to several flavour physics and precision electroweak measurements. The addition of vector-like quark singlets breaks the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix and enables tree-level flavour changing neutral (FCN) vertices. The resulting radiative flavour changing decays of these particles through the electromagnetic transition dipole moment are a key means to study their properties and search for them at experiments like the Large Hadron Collider (LHC). Despite these radiative decays providing such a clean experimental signature, an explicit analytical study of the branching ratios and $CP$ violation resulting from these loop level processes has thus far evaded attention. We provide the formulation for the decay rates and $CP$ asymmetry resulting from a combination of the imaginary components of the loop integrals and complex phases in the quark mixing matrix. We then apply our analytical results to study phenomenology of these states for several global fits pertaining to vector-like isosinglets $t^{\prime }$ and $b^{\prime }$. We find that clean collider signatures and polarisation observables can be generated for both $t^{\prime }$ and $b^{\prime }$.

    hep-phJHEP(2022)·28 citations
24. 24*

    R-Parity Violation Axiogenesis

    Raymond T. Co🇺🇸 · Keisuke Harigaya🇺🇸 · Zachary Johnson🇺🇸 · Aaron Pierce🇺🇸

    We show that the rotation of the QCD axion field, aided by $B-L$ violation from supersymmetric $R$-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field into a quark chiral asymmetry, which $R$-parity violating couplings convert to the baryon asymmetry of the Universe. We focus on the case of dimensionless $R$-parity violating couplings with textures motivated by grand unified theories and comment on more general scenarios. The axion decay constant and mass spectrum of supersymmetric particles are constrained by Big Bang nucleosynthesis, proton decay from the $R$-parity violation, and successful thermalization of the Peccei-Quinn symmetry breaking field. Axion dark matter may be produced by the axion rotation via the kinetic misalignment mechanism for axion decay constants below $10^{10}$ GeV, or by the conventional misalignment mechanism for $10^{11-12}$ GeV. The viable parameter region can be probed by proton decay and axion searches. This scenario may also have connections with collider experiments, including searches for long-lived particles, and observations of gravitational waves.

    hep-phJHEP(2021)·41 citations
25. 25*

    Inflaton freeze-out

    Oleg Lebedev🇫🇮 · Thomas Nerdi🇫🇮 · Timofey Solomko🇷🇺 · Jong-Hyun Yoon🇫🇮

    We study the possibility that, after inflation, the inflaton reaches thermal equilibrium with the Standard Model thermal bath and eventually freezes-out in the non-relativistic regime. When the inflaton decay is the sole source of (non-thermal) dark matter, its relic density is automatically suppressed. We delineate parameter space leading to the correct dark matter abundance. The model allows for a significant Higgs-inflaton coupling which may lead to invisible Higgs decay into inflaton pairs at the LHC.

    hep-phastro-ph.COPRD(2022)·6 citations
26. 26*

    The mysterious diffuse UV radiation and Axion Quark Nugget dark matter model

    Ariel Zhitnitsky🇨🇦

    It has been recently argued [1-3] that there is a strong component of the diffuse far-ultraviolet (FUV) background which is hard to explain by conventional physics in terms of the dust-scattered starlight. We propose that this excess in FUV radiation might be result of the dark matter annihilation events within the so-called axion quark nugget (AQN) dark matter model, which was originally invented for completely different purpose to explain the observed similarity between the dark and the visible components in the Universe, i.e. ${\Omega }_{\mathrm{DM}}\sim {\Omega }_{\mathrm{visible}}$. We support this proposal by demonstrating that intensity and the spectral features of the AQN induced emissions are consistent with the corresponding characteristics of the observed excess of the FUV radiation. If the future studies confirm the puzzling characteristics observed in [1-3] it might unlock a much more deeper and fundamental problem of modern cosmology-- it may reveal the nature of the dark matter.

    hep-phastro-ph.GAPLB(2022)·14 citations
27. 27*

    Chiral extrapolation of hadronic vacuum polarization

    Gilberto Colangelo🇨🇭 · Martin Hoferichter🇨🇭 · Bastian Kubis🇩🇪 · Malwin Niehus🇩🇪 · Jacobo Ruiz de Elvira🇨🇭

    We study the pion-mass dependence of the two-pion channel in the hadronic-vacuum-polarization (HVP) contribution to the anomalous magnetic moment of the muon $a_{\mu }^{\text{HVP}}$, by using an Omnès representation for the pion vector form factor with the phase shift derived from the inverse-amplitude method (IAM). Our results constrain the dominant isospin-$1$ part of the isospin-symmetric light-quark contribution, and should thus allow one to better control the chiral extrapolation of $a_{\mu }^{\text{HVP}}$, required for lattice-QCD calculations performed at larger-than-physical pion masses. In particular, the comparison of the one- and two-loop IAM allows us to estimate the associated systematic uncertainties and show that these are under good control.

    hep-phhep-latnucl-thPLB(2022)·41 citations
28. 28*

    General Gauge-Yukawa-Quartic $\beta$-Functions at 4-3-2--Loop Order

    Joshua Davies🇬🇧 · Florian Herren🇺🇸 · Anders Eller Thomsen🇨🇭

    We determine the full set of coefficients for the completely general 4-loop gauge and 3-loop Yukawa $\beta$-functions for the most general renormalizable four-dimensional theories. Using a complete parametrization of the $\beta$-functions, we compare the general form to the specific $\beta$-functions of known theories to constrain the unknown coefficients. The Weyl consistency conditions provide additional constraints, completing the determination.

    hep-phhep-thJHEP(2022)·40 citations
29. 29*

    Almost relevant corrections for direct measurements of electron's g-factor

    Benjamin Koch🇦🇹 · Felipe Asenjo🇨🇱 · Sergio Hojman🇨🇱

    We revisit the observable used for the direct measurements of the electron's $g$ factor. This is done by considering the sub-leading effects of the large magnetic background field and virtual Standard Model processes. We find substantial corrections to the Landau levels of the electron. Implications for the observed magnetic moment and the tension between direct and indirect measurement are discussed.

    hep-phPRD(2022)·2 citations
30. 30*

    Z_{c,b}-like states from QCD Laplace sum rules at NLO

    S. Narison🇫🇷 · D. Rabetiarivony🇲🇬

    We review our results on $Z_c$-like states[1] which we complete with the ones on $Z_b$-like states by using relativistic QCD Laplace Sum Rules (LSR) within stability criteria and including Factorized Next-to-Leading Order (FNLO) Perturbative (PT) corrections and Lowest Order (LO) QCD condensates up to $⟨G^3⟩$. We emphasize the importance of PT radiative corrections for heavy quark sum rules in order to justify the use of the running heavy quark mass in the analysis. Our estimates are compiled in Tables 3 and 4. From our results, the observed $Z_{cs}(3983)$ state are good candidate for being ${\mathcal{T}}_{cs}$ tetramole (superposition of nearly degenerated molecules and tetraquark states having the same quatum numbers $J^{PC}$ and with almost the same couplings to the currents). The $Z_{cs}$ bump around 4100 MeV can be interpreted as a combination of $D_0^{\ast }{D}_{s1}$ and $D_{s0}^{\ast }{D}_1$ molecules. The physical states $Z_{cs}(4000)$ and $Z_{cs}(4220)$ found by LHCb are too low to be considered as the first radial excitations of $Z_{cs}(3983)$. For the future $Z_b$, $Z_{bs}$ and $Z_{bss}$, we suggest to scan the region around $(10.3\sim 10.9)$ GeV while the 1st radial excitations are about 2.4 GeV above the ground states.

    hep-phNucl.Part.Phys.Proc.(2022)·4 citations
31. 31*

    From Neutrino Masses to the Full Size of the Universe

    Bodo Lampe🇩🇪

    Our universe is a 3-dimensional elastic substrate which once has condensed and now is expanding within some higher dimensional space. The elastic substrate is built from tiny invisible constituents, called tetrons, with bond length about the Planck length and binding energy the Planck energy. All ordinary matter particles are quasiparticle excitations of the tetrons gliding on the elastic medium. Since the quasiparticles fulfill Lorentz covariant wave equations, they perceive the universe as a 3+1 dimensional spacetime continuum lacking a preferred rest system. Any type of mass/energy induces curvature on the spacetime continuum as determined by the Einstein equations. The 24 known quarks and leptons arise as eigenmode excitations of a tetrahedral fiber structure, which is made up from 4 tetrons and extends into 3 additional dimensions. While the laws of gravity are due to the elastic properties of the tetron bonds, particle physics interactions take place within the fibers. I will concentrate on three of the most intriguing features of the model: (i) Understanding small neutrino masses from the conservation of isospin, and, more in general, calculating the spectrum of quark and lepton masses. This is obtained from the tetron model's interpretation of the Higgs mechanism. As a byproduct, the connection between the large top mass and the electroweak symmetry breaking becomes apparent. (ii) The possibility to determine the full size of the universe from future dark energy measurements. This is obtained from the tetron model's interpretation of the dark energy effect. (iii) Finally, the origin of the big bang `Hubble tension' within the tetron scheme will be elucidated, and deviations from the standard picture such as a varying Newton constant are discussed.

    hep-ph0 citations
32. 32*

    Late-transition vs smooth $H(z)$ deformation models for the resolution of the Hubble crisis

    George Alestas🇬🇷 · David Camarena🇧🇷 · Eleonora Di Valentino🇬🇧 · Lavrentios Kazantzidis🇬🇷 · Valerio Marra🇧🇷 · Savvas Nesseris🇪🇸 · Leandros Perivolaropoulos🇬🇷

    Gravitational transitions at low redshifts ($z_t<0.1$) have been recently proposed as a solution to the Hubble and growth tensions. Such transitions would naturally lead to a transition in the absolute magnitude $M$ of type Ia supernovae (SnIa) at $z_t$ (Late $M$ Transitions - $LMT$) and possibly in the dark energy equation of state parameter $w$ (Late $w-M$ Transitions - $LwMT$). Here, we compare the quality of fit to cosmological data of this class of models, with the corresponding quality of fit of the cosmological constant model ($\Lambda$CDM) and some of the best smooth $H(z)$ deformation models ($w$CDM, CPL, PEDE). We also perform model selection via the Akaike Information Criterion and the Bayes factor. We use the full CMB temperature anisotropy spectrum data, the baryon acoustic oscillations (BAO) data, the Pantheon SnIa data, the SnIa absolute magnitude $M$ as determined by Cepheid calibrators and the value of the Hubble constant $H_0$ as determined by local SnIa calibrated using Cepheids. We find that smooth $H(z)$ deformation models perform worse than transition models for the following reasons: 1) They have a worse fit to low-$z$ geometric probes (BAO and SnIa data); 2) They favor values of the SnIa absolute magnitude $M$ that are lower as compared to the value $M_c$ obtained with local Cepheid calibrators at $z<0.01$; 3) They tend to worsen the ${\Omega }_{\mathrm{m},0}-{\sigma }_{8,0}$ growth tension. We also find that the $w-M$ transition model ($LwMT$) does not provide a better quality of fit to cosmological data than a pure $M$ transition model ($LMT$) where $w$ is fixed to the \lcdm value $w=-1$ at all redshifts. We conclude that the $LMT$ model has significant statistical advantages over smooth late-time $H(z)$ deformation models in addressing the Hubble crisis.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2022)·103 citations
33. 33*

    Probing gluon helicity with heavy flavor at the EIC

    Daniele Paolo Anderle🇨🇳 · Xin Dong🇺🇸 · Felix Hekhorn🇮🇹 · Matthew Kelsey🇺🇸 · Sooraj Radhakrishnan🇺🇸 · Ernst Sichtermann🇺🇸 · Lei Xia🇨🇳 · Hongxi Xing🇨🇳 · Feng Yuan🇺🇸 · Yuxiang Zhao🇨🇳

    We propose a new measurement of the heavy flavor hadron double spin asymmetry in deep-inelastic scattering at a future Electron-Ion Collider (EIC) to constrain the polarized gluon distribution function inside the proton. Statistical projection on $D^0$ meson double spin asymmetry is calculated with an EIC central detector using an all-silicon tracker and vertexing subsystem. A first impact study was done by interpreting pseudo-data at next-to-leading order in QCD. The sensitivity of the experimental observable in constraining gluon helicity distribution in a wide range of parton momentum fraction $x$ has been investigated considering different beam energy configurations. This measurement complements the inclusive spin-dependent structure function measurement and provides an opportunity to constrain the gluon helicity distribution in the moderate $x$ region.

    ↳ hep-exhep-phnucl-exnucl-thPRD(2021)·11 citations
34. 34*

    Interglueball potential in lattice SU(N) gauge theories

    Nodoka Yamanaka🇯🇵 · Atsushi Nakamura🇯🇵 · Masayuki Wakayama🇯🇵

    The dynamics of the glueballs is important in the context of the experimental search as well as for understanding the non-Abelian gauge theory. The glueballs of the dark $SU(N_c)$ Yang-Mills theory are also good candidates of dark matter. In this proceedings contribution, we report on the result of the lattice calculation of the interglueball potential of the Yang-Mills theory with the color numbers $N_c=2,3,4$, with a detailed inspection of the systematics due to the discretization.

    ↳ hep-lathep-phnucl-thPoS(2022)·13 citations
35. 35*

    Configuration entropy and stability of bottomonium radial excitations in a plasma with magnetic fields

    Nelson R. F. Braga🇧🇷 · Yan F. Ferreira🇧🇷 · Luiz F. Ferreira🇧🇷

    Heavy vector mesons produced in a heavy ion collision are important sources of information about the quark gluon plasma (QGP). For instance, the fraction of bottomonium states observed in such a collision is altered by the dissociation effect caused by the plasma. So, it is very important to understand how the properties of the plasma, like temperature $(T)$, density and the presence of background magnetic fields $(eB)$, affect the dissociation of bottomonium in the thermal medium. AdS/QCD holographic models provide a tool for investigating the properties of heavy mesons inside a thermal medium. The meson states are represented by quasinormal modes in a black hole geometry. In this work we calculate the quasinormal modes and the associated complex frequencies for the four lowest levels of radial excitation of bottomonium inside a plasma with a magnetic field background. We also calculate the differential configuration entropy (DCE) for all these states and investigate how the dissociation effect produced by the magnetic field is translated into a dependence of the DCE on $eB$. An interesting result obtained in this study is that the DCE increases with the radial excitation level $n$. Also, a nontrivial finding of this work is that the energy density associated with the bottomonium quasinormal modes presents a singularity near the black hole horizon for some combination of values of $T,eB$ and $n$. As we show here, it is possible to separate the singular factor and define a square integrable quantity that provides a DCE that is always finite. In addition, we discovered that, working with the potentially singular energy density, one finds a very interesting way to use the DCE as a tool for determining the dissociation temperature of the meson quasisates.

    ↳ hep-thhep-phPRD(2022)·23 citations
36. 36*

    Singly heavy baryons in nuclear matter from an SU(3) chiral soliton model

    Ho-Yeon Won🇰🇷 · Ulugbek Yakhshiev🇰🇷 · Hyun-Chul Kim🇰🇷

    We investigate how the masses of the singly heavy baryons undergo changes in nuclear matter, based on a medium-modified SU(3) chiral soliton model. Having explained the bulk properties of nuclear matter, we discuss the masses of the singly heavy baryons in nuclear matter. We generalize the vector-meson Lagrangian including the heavy-meson soliton interaction. The mass spectrum of the singly heavy baryon are obtained with the effects of explicit SU(3) symmetry breaking considered as a perturbation. The results show that the mass of the singly heavy baryon mass in nuclear medium is rather sensitive to the medium modifications of the heavy meson mass.

    ↳ nucl-thhep-phJ.Phys.G(2022)·3 citations
37. 37*

    Determination of the light, strange and charm quark masses using twisted mass fermions

    C. Alexandrou🇨🇾 · S. Bacchio🇨🇾 · G. Bergner🇩🇪 · M. Constantinou🇺🇸 · M. Di Carlo🇬🇧 · P. Dimopoulos🇮🇹 · J. Finkenrath🇨🇾 · E. Fiorenza🇩🇪 · R. Frezzotti🇮🇹 · M. Garofalo🇩🇪 · K. Hadjiyiannakou🇨🇾 · B. Kostrzewa🇩🇪 and 14 other authors

    We present results for the light, strange and charm quark masses using $N_f=2+1+1$ twisted mass fermion ensembles at three values of the lattice spacing, including two ensembles simulated with the physical value of the pion mass. The analysis is done both in the meson and baryon sectors. The difference in the mean values found in the two sectors is included as part of the systematic error. The presentation is based on the work of Ref. [1], where more details can be found.

    ↳ hep-lathep-phPoS(2022)·1 citation
38. 38*

    Relativistic second-order dissipative hydrodynamics from Zubarev's non-equilibrium statistical operator

    Arus Harutyunyan🇦🇲 · Armen Sedrakian🇩🇪 · Dirk H. Rischke🇩🇪

    We present a new derivation of relativistic second-order dissipative hydrodynamics for quantum systems using Zubarev's non-equilibrium statistical-operator formalism. This is achieved by a systematic expansion of the energy-momentum tensor and the charge current to second order in deviations from equilibrium. As a concrete example, we obtain the relaxation equations for the shear-stress tensor, the bulk-viscous pressure, and the charge-diffusion currents required to close the set of equations of motion for relativistic second-order dissipative hydrodynamics. We also identify new transport coefficients which describe the relaxation of dissipative processes to second order and express them in terms of equilibrium correlation functions, thus establishing new Kubo-type formulas for second-order transport coefficients.

    ↳ nucl-thastro-ph.HEhep-phhep-thAnnals Phys.(2022)·28 citations
39. 39*

    The Yukawa interaction in ordinary quantum mechanics

    Daniel Schubring🇺🇸

    The Yukawa interaction is considered in 0+1 dimensions as a pedagogical example to illustrate quantum field theory methods. From the quantum mechanical point of view the system is trivially exactly solvable, but this can be difficult to see from the path integral perspective. It is shown how despite initial appearances the perturbation series in terms of Feynman diagrams is consistent with the quantum mechanical picture for finite temperature.

    ↳ quant-phhep-phEur.J.Phys.(2022)·1 citation
40. 40*

    Entanglement entropy production in deep inelastic scattering

    Kun Zhang🇺🇸 · Kun Hao🇨🇳 · Dmitri Kharzeev🇺🇸 · Vladimir Korepin🇺🇸

    Deep inelastic scattering (DIS) samples a part of the wave function of a hadron in the vicinity of the light cone. Lipatov constructed a spin chain which describes the amplitude of DIS in leading logarithmic approximation. Kharzeev and Levin proposed the entanglement entropy as an observable in DIS [Phys. Rev. D 95, 114008 (2017)], and suggested a relation between the entanglement entropy and parton distributions. Here we represent the DIS process as a local quench in the Lipatov's spin chain, and study the time evolution of the produced entanglement entropy. We show that the resulting entanglement entropy depends on time logarithmically, $\mathcal{S}(t)=1/3\ln (t/\tau )$ with $\tau =1/m$ for $1/m\le t\le (mx{)}^{-1}$, where $m$ is the proton mass and $x$ is the Bjorken $x$. The central charge $c$ of Lipatov's spin chain is determined here to be $c=1$; using the proposed relation between the entanglement entropy and parton distributions, this corresponds to the gluon structure function growing at small $x$ as $xG(x)\sim 1/x^{1/3}$.

    ↳ quant-phhep-phhep-thPRD(2022)·48 citations
41. 41*

    QFT without infinities and hierarchy problem

    Sander Mooij🇨🇭 · Mikhail Shaposhnikov🇨🇭

    The standard way to do computations in Quantum Field Theory (QFT) often results in the requirement of dramatic cancellations between contributions induced by a "heavy" sector into the physical observables of the "light" (or low energy) sector - the phenomenon known as "hierarchy problem". This procedure uses divergent multi-loop Feynman diagrams, their regularisation to handle the UV divergences, and then renormalisation to remove them. At the same time, the ultimate outcome of the renormalisation is the mapping of several finite parameters defining the renormalisable field theory into different observables (e.g. all kinds of particle cross-sections). In this paper, we first demonstrate how to relate the parameters of the theory to observables without running into intermediate UV divergences. Then we go one step further: we show how in theories with different mass scales, all physics of the "light" sector can be computed in a way which does not require dramatic cancellations induced by physics of the "heavy" sector. The existence of such a technique suggests that the "hierarchy problem" in renormalisable theories is not really physical, but rather an artefact of the conventional procedure to compute correlation functions. If the QFT is defined by the "divergencies-free" method all fine-tunings in theories with well separated energy scales may be avoided.

    ↳ hep-thhep-phNPB(2023)·21 citations
42. 42*

    $S$ parameter from a prototype composite-Higgs model

    Yigal Shamir🇮🇱 · Maarten Golterman🇺🇸 · William I. Jay🇺🇸 · Ethan T. Neil🇺🇸 · Benjamin Svetitsky🇮🇱

    We have calculated the low-energy constant $L_{10}$ in a prototype composite Higgs model with dynamical fermions in two different representations of the gauge group. The resulting contribution of the new strong sector to the $S$ parameter is consistent with current bounds on the vacuum misalignment parameter. We end with a brief discussion of future directions.

    ↳ hep-lathep-phPoS(2022)·9 citations
43. 43*

    A new method for a lattice calculation of ${\eta }_c\to 2\gamma$

    Yu Meng🇨🇳

    We propose a direct method to calculate the decay width of a hadron decaying to two photons, which is conventionally obtained by an extrapolation for various off-shell form factors. The new method provides an simple way to examine the finite-volune effects. As an example, we apply the method to ${\eta }_c\to 2\gamma$. Using three $N_f=2$ twisted-mass gauge ensembles with different lattice spacings, we obtain the final decay width ${\Gamma }_{{\eta }_c\gamma \gamma }=6.57(15{)}_{\text{stat}}(8{)}_{\text{syst}}$ keV, where the systematic error accounts for the fine-tuning of the charm quark mass. This method can also be applied for other processes which involve the leptonic or radiative particles in the final states.

    ↳ hep-lathep-exhep-phPoS(2022)·2 citations
44. 44*

    Nonperturbative two-pion exchange contributions to the nucleon-nucleon interaction in covariant baryon chiral perturbation theory

    Chun-Xuan Wang🇨🇳 · Jun-Xu Lu🇨🇳 · Yang Xiao🇨🇳 · Li-Sheng Geng🇨🇳

    We calculate the nonperturbative two-pion exchange (TPE) contributions to the $NN$ interaction in covariant baryon chiral perturbation theory. We study how the nonperturbative resummation affects the $NN$ phase shifts for partial waves with $J\ge 3$ and $L\le 6$. No significant differences are observed between the nonperturbative phase shifts and perturbative ones for most partial waves except for ${}^3{D}_3$, for which the nonperturbative resummation greatly improves the description of the phase shifts. However, a significant cutoff dependence is found for this partial wave and a reasonable description of the phase shifts can only be obtained with a particular cutoff. Furthermore, we compare the so-obtained nonperturbative phase shifts with those obtained in the heavy baryon chiral perturbation theory. We show that the contributions from relativistic nonperturbative TPE are more moderate than those from the nonrelativistic TPE obtained in the dimensional regularization scheme. A proper convergence pattern is observed for most of the partial waves studied except for ${}^3{F}_3$, ${}^3{F}_4$, and ${}^3{H}_6$, for which the subleading TPE contributions are a bit strong. We find that for $H$ and $I$ partial waves, the OPE alone can already describe the phase shifts reasonably well.

    ↳ nucl-thhep-exhep-lathep-ph+1PRC(2022)·14 citations
45. 45*

    IR/UV mixing from local similarity maps of scalar non-Hermitian field theories

    Maxim N. Chernodub🇫🇷 · Peter Millington🇬🇧

    We propose to "gauge" the group of similarity transformations that acts on a space of non-Hermitian scalar theories. We introduce the "similarity gauge field", which acts as a gauge connection on the space of non-Hermitian theories characterized by (and equivalent to a Hermitian) real-valued mass spectrum. This extension leads to new effects: if the mass matrix is not the same in distant regions of space, but its eigenvalues coincide pairwise in both regions, the particle masses stay constant in the whole spacetime, making the model indistinguishable from a standard, low-energy and scalar Hermitian one. However, contrary to the Hermitian case, the high-energy scalar particles become unstable at a particular wavelength determined by the strength of the emergent similarity gauge field. This instability corresponds to momentum-dependent exceptional points, whose locations cannot be identified from an analysis of the eigenvalues of the coordinate-dependent squared mass matrix in isolation, as one might naively have expected. For a doublet of scalar particles with masses of the order of 1 MeV and a similarity gauge rotation of order unity at distances of 1 meter, the corrections to the masses are about 10^{-7}eV, which makes no experimentally detectable imprint on the low-energy spectrum. However, the instability occurs at 10^{18} eV, suggestively in the energy range of detectable ultra-high-energy cosmic rays, thereby making this truly non-Hermitian effect and its generalizations of phenomenological interest for high-energy particle physics.

    ↳ hep-thcond-mat.otherhep-phPRD(2022)·10 citations
46. 46*

    Vortical Quantum Memory

    Kazuki Ikeda🇨🇦 · Dmitri E. Kharzeev🇺🇸 · Yuta Kikuchi🇺🇸

    Quantum memory is a crucial component of a quantum information processor, just like a classical memory is a necessary ingredient of a conventional computer. Moreover, quantum memory of light would serve as a quantum repeater needed for quantum communication networks. Here we propose to realize the quantum memory coupled to magnetic modes of electromagnetic radiation (e.g. those found in cavities and optical fibers) using vortices in Quantum Hall systems. We describe the response to an external magnetic mode as a quench, and find that it sets an oscillation between vortices and antivortices, with the period controlled by the amplitude of the magnetic mode, and the phase locked to the phase of the magnetic mode. We support our proposal by real-time Hamiltonian field theory simulations.

    ↳ quant-phcond-mat.mes-hallhep-phhep-th+10 citations
47. 47*

    Structure of Chern-Simons Scattering Amplitudes from Topological Equivalence Theorem and Double-Copy

    Yan-Feng Hang🇨🇳 · Hong-Jian He🇨🇳 · Cong Shen🇨🇳

    We study the mechanism of topological mass-generation for 3d Chern-Simons (CS) gauge theories, where the CS term can retain the gauge symmetry and make gauge boson topologically massive. Without CS term the 3d massless gauge boson has a single physical transverse polarization state, while adding the CS term converts it into a massive physical polarization state and conserves the total physical degrees of freedom. We newly formulate the mechanism of topological mass-generation at $S$-matrix level. For this, we propose and prove a new Topological Equivalence Theorem (TET) which connects the $N$-point scattering amplitude of the gauge boson's physical polarization states ($A_{\mathrm{P}}^a$) to that of the transverse polarization states ($A_{\mathrm{T}}^a$) under high energy expansion. We present a general 3d power counting method on the leading energy dependence of $N$-point scattering amplitudes in both topologically massive Yang-Mills (TMYM) and topologically massive gravity (TMG) theories. With these, we uncover a general energy cancellation mechanism for $N$-gauge boson scattering amplitudes which predicts the cancellation $E^4\to E^{4-N}$ at tree level. Then, we compute the four-point amplitudes of $A_{\mathrm{P}}^a$'s and of $A_{\mathrm{T}}^a$'s, with which we explicitly demonstrate the TET and establish such energy cancellations. We further extend the double-copy approach and construct the four-point massive graviton amplitude of the TMG theory from the massive gauge boson amplitude of the TMYM theory. With these, we newly uncover striking large energy cancellations $E^{12}\to E^1$ in the four-graviton amplitude of the TMG, and establish its new correspondence to the leading energy cancellations $E^4\to E^0$ in the four-gauge boson amplitude of the TMYM.

    ↳ hep-thgr-qchep-phJHEP(2022)·23 citations
48. 48*

    Reconstructing the Kinematics of Deep Inelastic Scattering with Deep Learning

    Miguel Arratia🇺🇸 · Daniel Britzger🇩🇪 · Owen Long🇺🇸 · Benjamin Nachman🇺🇸

    We introduce a method to reconstruct the kinematics of neutral-current deep inelastic scattering (DIS) using a deep neural network (DNN). Unlike traditional methods, it exploits the full kinematic information of both the scattered electron and the hadronic-final state, and it accounts for QED radiation by identifying events with radiated photons and event-level momentum imbalance. The method is studied with simulated events at HERA and the future Electron-Ion Collider (EIC). We show that the DNN method outperforms all the traditional methods over the full phase space, improving resolution and reducing bias. Our method has the potential to extend the kinematic reach of future experiments at the EIC, and thus their discovery potential in polarized and nuclear DIS.

    ↳ hep-exhep-phnucl-exNucl.Instrum.Meth.A(2022)·30 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.