Fri·Nov 11, 2022Friday·November 11, 2022

1. 01*

   Mueller's dipole wave function in QCD: emergent KNO scaling in the double logarithm limit

   Yizhuang Liu🇵🇱 · Maciej A. Nowak🇵🇱 · Ismail Zahed🇺🇸

   We analyze Mueller's QCD dipole wave function evolution in the double logarithm approximation (DLA). Using complex analytical methods, we show that the distribution of dipole in the wave function (gluon multiplicity distribution) asymptotically satisfies the Koba-Nielsen-Olesen (KNO) scaling, with a non-trivial scaling function $f(z)$ with $z=\frac{n}{\bar{n}}$. The scaling function decays exponentially as $2(2.55{)}^{2}z{e}^{-\frac{z}{0.3917}}$ at large $z$, while its growth is log-normal as $e^{-\frac{1}{2}{\ln }^{2}z}$ for small-$z$. A detailed analysis of the Fourier-Laplace transform of $f(z)$, allows for performing the inverse Fourier transform, and access the non-asymptotic bulk-region around the peak. The bulk and asymptotic results are shown to be in good agreement with the measured hadronic multiplicities in DIS, as reported by the H1 collaboration at HERA in the region of large $Q^2$. A numerical tabulation of $f(z)$ is included. Remarkably, the same scaling function is found to emerge in the resummation of double logarithms in the evolution of jets. Using the generating function approach, we show why this is the case. The absence of KNO scaling in non-critical and super-renormalizable theories is briefly discussed. We also discuss the universal character of the entanglement entropy in the KNO scaling limit, and its measurement using the emitted multiplicities in DIS and $e^{+}{e}^{-}$ annihilation.

   hep-phhep-thnucl-exnucl-thPRD(2023)·24 citations
2. 02*

   The Phenomenology of Quadratically Coupled Ultra Light Dark Matter

   Abhishek Banerjee🇮🇱 · Gilad Perez🇮🇱 · Marianna Safronova🇺🇸 · Inbar Savoray🇮🇱 · Aviv Shalit🇮🇱

   We discuss models of ultralight scalar Dark Matter (DM) with linear and quadratic couplings to the Standard Model (SM). In addition to studying the phenomenology of linear and quadratic interactions separately, we examine their interplay. We review the different experiments that can probe such interactions and present the current and expected future bounds on the parameter space. In particular, we discuss the scalar field solution presented in [A. Hees, O. Minazzoli, E. Savalle, Y. V. Stadnik and P. Wolf, Phys.Rev.D 98 (2018) 6, 064051], and extend it to theories that capture both the linear and the quadratic couplings of the DM field to the SM. Furthermore, we discuss the theoretical aspects and the corresponding challenges for natural models in which the quadratic interactions are of phenomenological importance.

   hep-phhep-exphysics.atom-phJHEP(2023)·95 citations
3. 03*

   New methods to achieve meson, muon and gamma light sources through asymmetric electron positron collisions

   Dawei Fu🇨🇳 · Alim Ruzi🇨🇳 · Meng Lu🇨🇳 · Qiang Li🇨🇳

   We propose methods to produce energetic meson beams such as charged and neutral Kaons, which are boosted to be collimated and with relatively long life time. The first type of methods is based on asymmetric electron positron collisions with a center of mass energy of, e.g., 1020 MeV, and Kaons can be produced at a rate of $10^{4-5}/s$. The electron and positron beams are either asymmetric in energy, e.g., 10 GeV electron beam with 26 MeV positron beam, or asymmetric in space, e.g., 10 GeV electron and positron beams collisions separated with a angle around 0.05 radius. Such proposals should be able to be achieved with a reasonable budget. The other type of method is relying on TeV positron on target experiment, where Kaon beams can be achieved at around $10^7$ per bunch crossing. Such Kaon beams are clean with small contamination, and can have great physics potential on, e.g., hyperon searches through Kaon nuclei collision, Kaon rare decay measurement, and Kaon proton or Kaon lepton collisions. The same technique with very asymmetric electron positron collisions can also be extended to other final states such as pions and tau leptons.

   hep-phhep-exnucl-exphysics.acc-phInt.J.Mod.Phys.A(2023)·2 citations
4. 04*

   $a_0(980)$-meson twist-2 distribution amplitude within the QCD sum rules and investigation of $D\to a_0(980)(\to \eta \pi )e^{+}{\nu }_e$

   Zai-Hui Wu🇨🇳 · Hai-Bing Fu🇨🇳 · Tao Zhong🇨🇳 · Dong Huang🇨🇳 · Dan-Dan Hu🇨🇳 · Xing-Gang Wu🇨🇳

   In this paper, moments of $a_0(980)$-meson twist-2 light-cone distribution amplitudes were deeply researched by using QCD sum rules approach within background field theory. Up to 9th-order accuracy, we present $⟨{\xi }_{2;a_0}^n⟩{|}_{{\mu }_0}$ at the initial scale ${\mu }_0=1\mathrm{GeV}$, i.e. $⟨{\xi }_{2;a_0}^1⟩{|}_{{\mu }_0}=-0.307(43)$, $⟨{\xi }_{2;a_0}^3⟩{|}_{{\mu }_0}=-0.181(34)$, $⟨{\xi }_{2;a_0}^5⟩{|}_{{\mu }_0}=-0.078(28)$, $⟨{\xi }_{2;a_0}^7⟩{|}_{{\mu }_0}=-0.049(26)$, $⟨{\xi }_{2;a_0}^9⟩{|}_{{\mu }_0}=-0.036(24)$, respectively. An improved light-cone harmonic oscillator model for $a_0(980)$-meson twist-2 light-cone distribution amplitudes is adopted, where its parameters are fixed by using the least squares method based on the $⟨{\xi }_{2;a_0}^n⟩{|}_{{\mu }_0}$, and their goodness of fit reach to $95.4\%$. Then, we calculate the $D\to a_0(980)$ transition form factors within the light-cone sum rules approach, and at largest recoil point, we obtain $f_{+}^{D\to a_0}(0)=1.058_{-0.035}^{+0.068}$ and $f_{-}^{D\to a_0}(0)=0.764_{-0.036}^{+0.044}$. As a further application, the branching fractions of the $D\to a_0(980)\ell {\bar{\nu }}_{\ell }$ semileptonic decays are given. Taking the decay $a_0(980)\to \eta \pi$ into consideration, we obtain $\mathcal{B}(D^0\to a_0(980{)}^{-}(\to \eta {\pi }^{-})e^{+}{\nu }_e)=(1.330_{-0.134}^{+0.216})\times 10^{-4}$, $\mathcal{B}(D^{+}\to a_0(980{)}^0(\to \eta {\pi }^0)e^{+}{\nu }_e)=(1.675_{-0.169}^{+0.272})\times 10^{-4}$, which are consistent with the BESIII collaboration and PDG data within errors. Finally, we present the angle observables of forward-backward asymmetries, $q^2$-differential flat terms and lepton polarization asymmetry of the semileptonic decay $D\to a_0(980)\ell {\bar{\nu }}_{\ell }$.

   hep-phNPA(2023)·21 citations
5. 05*

   The proton radius and its relatives -- much ado about nothing?

   Ulf-G. Meißner🇩🇪

   I summarize the dispersion-theoretical analysis of the nucleon electromagnetic form factors. Special emphasis is given on the extraction of the proton charge radius and its relatives, the proton magnetic radius as well as the neutron magnetic radius. Some recent work on the hyperfine splitting in leptonic hydrogen and on radiative corrections to muon-proton scattering is also discussed. Some views on future studies are given.

   hep-phhep-exhep-latnucl-ex+1J.Phys.Conf.Ser.(2023)·9 citations
6. 06*

   Associated production of Higgs and single top at the LHC in presence of the SMEFT operators

   Subhaditya Bhattacharya🇮🇳 · Sanjoy Biswas🇮🇳 · Kuntal Pal🇺🇸 · Jose Wudka🇺🇸

   We analyse the single top production in association with the Higgs at the Large Hadron Collider (LHC) using Standard Model (SM) effective operators upto dimension six. We show that the presence of effective operators can significantly alter the existing bound on the top-Higgs Yukawa coupling. We analyse events at the LHC with 35.9 and 137(140) fb${}^{-1}$ integrated luminosities using both cut-based and machine learning techniques to probe new physics (NP) scale and operator coefficients addressing relevant SM background reduction. The four fermi effective operator(s) that contributes to the signal, turns out to be crucial and a bound on the operator coefficient is obtained from the present data and for future sensitivities.

   hep-phJHEP(2023)·7 citations
7. 07*

   The Unpolarized and Polarized Single-Mass Three-Loop Heavy Flavor Operator Matrix Elements $A_{gg,Q}$ and $\Delta A_{gg,Q}$

   J. Ablinger · A. Behring · J. Blümlein · A. De Freitas · A. Goedicke A. von Manteuffel C. Schneider · K. Schönwald

   We calculate the gluonic massive operator matrix elements in the unpolarized and polarized cases, $A_{gg,Q}(x,{\mu }^2)$ and $\Delta A_{gg,Q}(x,{\mu }^2)$, at three-loop order for a single mass. These quantities contribute to the matching of the gluon distribution in the variable flavor number scheme. The polarized operator matrix element is calculated in the Larin scheme. These operator matrix elements contain finite binomial and inverse binomial sums in Mellin $N$-space and iterated integrals over square root-valued alphabets in momentum fraction $x$-space. We derive the necessary analytic relations for the analytic continuation of these quantities from the even or odd Mellin moments into the complex plane, present analytic expressions in momentum fraction $x$-space and derive numerical results. The present results complete the gluon transition matrix elements both of the single- and double-mass variable flavor number scheme to three-loop order.

   hep-phhep-exJHEP(2022)·60 citations
8. 08*

   Vortex $\gamma$ photon generation via spin-to-orbital angular momentum transfer in nonlinear Compton scattering

   Mamutjan Ababekri🇨🇳 · Ren-Tong Guo🇨🇳 · Feng Wan🇨🇳 · B. Qiao🇨🇳 · Zhongpeng Li🇨🇳 · Chong Lv🇨🇳 · Bo Zhang🇨🇳 · Weimin Zhou🇨🇳 · Yuqiu Gu🇨🇳 · Jian-Xing Li🇨🇳

   Vortex $\gamma$ photons with intrinsic orbital angular momenta (OAM) possess a wealth of applications in various fields, e.g.-strong-laser physics, nuclear physics, particle physics and astrophysics-yet their generation remains unsettled. In this work, we investigate the generation of vortex $\gamma$ photons via nonlinear Compton scattering of ultrarelativistic electrons in a circularly polarized laser pulse. We develop a quantum electrodynamics scattering theory that explicitly addresses the multiphoton absorption and the angular momentum transfer mechanism. In pulsed laser fields, we unveil the vortex phase structure of the scattering matrix element, discuss how the vortex phase could be transferred to the radiated photon, and derive the radiation rate of the vortex $\gamma$ photon. We numerically examine the energy spectra and beam characteristics of the radiation, while also investigating the influence of finite laser pulses on the angular momentum and energy distribution of the emitted vortex $\gamma$ photons.

   hep-phPRD(2024)·25 citations
9. 09*

   Connect the Lorentz Violation to the Glashow Resonance Event

   Ding-Hui Xu🇨🇳 · Shu-Jun Rong🇨🇳

   The recent reported Glashow resonance (GR) event shows a promising prospect in the test of the Lorentz violation (LV) by the high-energy astrophysical neutrinos (HANs) around the resonant energy. However, since the production source and the energy spectra of HANs are uncertain at present, moderate LV effects may be concealed at the TeV energy-scale. In this paper, we propose the LV Hamiltonian of a special texture which can lead to the decoupling of ${\nu }_{\mu }$ (${\bar{\nu }}_{\mu }$). On the base of the decoupling, a noticeable damping of the GR event rate is shown for the HANs from the source dominated by ${\bar{\nu }}_{\mu }$, irrespective of the energy spectra of the HANs at Earth. Accordingly, the observation of GR events may bring stringent constraints on the LV and the production mechanism of HANs.

   hep-phMod.Phys.Lett.A(2023)·7 citations
10. 10*

    Hydrodynamization in hybrid Bjorken flow attractors

    Toshali Mitra🇮🇳 · Sukrut Mondkar🇮🇳 · Ayan Mukhopadhyay🇮🇳 · Anton Rebhan🇦🇹 · Alexander Soloviev🇦🇹

    Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.

    hep-phhep-thnucl-thJHEP(2024)·8 citations
11. 11*

    Nonlinear diffusion of fermions and bosons

    Georg Wolschin🇩🇪

    A nonlinear diffusion equation is proposed to account for thermalization in fermionic and bosonic systems through analytical solutions. For constant transport coefficients, exact time-dependent solutions are derived through nonlinear transformations, and the corresponding local equilibration times are deduced. Fermi-Dirac and Bose-Einstein distributions emerge as stationary solutions of the nonlinear equation. As examples, local thermalization of quarks and gluons in relativistic heavy-ion collisions, and of ultracold atoms including time-dependent Bose-Einstein condensate formation are discussed.

    hep-phphysics.atom-phEPL(2022)·7 citations
12. 12*

    Phenomenological description of the ${\pi }^{-}{\pi }^{+}$ $S$-waves in $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decays: The problem of phases

    N.N. Achasov🇷🇺 · G.N. Shestakov🇷🇺

    We present a phenomenological description of the LHCb data for the magnitudes and phases of the ${\pi }^{-}{\pi }^{+}$ $S$-wave amplitudes in the $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decays. We operate within a simple model that takes into account the known pair interactions of particles in coupled channels. The seed complex amplitudes for various intermediate state production are assumed to be independent of the energy. Their values are determined by fitting. This model gives the satisfactorily description of virtually all features of the energy dependence of the experimentally measured $S$-wave amplitudes in the $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decays in the regions $2m_{\pi }<m_{{\pi }^{-}{\pi }^{+}}<1.39\text{mbox}GeV$ and $2m_{\pi }<m_{{\pi }^{-}{\pi }^{+}}<1.29\text{mbox}GeV$, respectively.

    hep-phhep-exnucl-exnucl-thPRD(2023)·3 citations
13. 13*

    Analytic results for the massive sunrise integral in the context of an alternative perturbative calculational method

    G. Dallabona🇧🇷 · O. A. Battistel🇧🇷

    An explicit investigation about the equal-mass two-loop sunrise Feynman graph is performed. Such perturbative amplitude is related with many important physical process treated in the standard model context. The background of this investigation is an alternative strategy to handle with the divergences typical of perturbative solutions of quantum field theory. Since its proposition, the mentioned method was exhaustively used to calculate and manipulate one-loop Feynman integrals with a great success. However, the great advances in precision of experimental data collected in particle physics colliders have pushed up theoretical physicists to improve their predictions through multi-loops calculations. In the present job, we describe the main steps required to perform two-loops calculations within the context of the referred method. We show that the same rules used for one-loop calculations are enough to deal with two-loops graphs as well. Analytic results for the sunrise graph are obtained in terms of elliptic multiple polylogarithms as well as a numerical analysis is provided.

    hep-phInt.J.Mod.Phys.A(2023)·5 citations
14. 14*

    A comparison between the $P_c$ and $P_{cs}$ systems

    Kan Chen🇨🇳 · Zi-Yang Lin🇨🇳 · Shi-Lin Zhu🇨🇳

    We construct the effective potentials of the $P_c$ and $P_{cs}$ states based on the SU(3)${}_{\text{f}}$ symmetry and heavy quark symmetry. Then we perform the coupled-channel analysis of the lowest isospin $P_c$ and $P_{cs}$ systems. The coupled-channel effects play different roles in the $P_c$ and $P_{cs}$ systems. In the $P_c$ systems, this effect gives minor corrections to the masses of the $P_c$ states. In the $P_{cs}$ system, the ${\Lambda }_c{\bar{D}}_s-{\Xi }_c\bar{D}$ coupling will shift the mass of the $P_{cs}(4338)$ close to the ${\Xi }_c\bar{D}$ threshold. The ${\Lambda }_c{\bar{D}}_s^{(\ast )}-{\Xi }_c{\bar{D}}^{(\ast )}$ coupling will also produce extra $P_{cs}$ states. We discuss the correspondence between the $P_c$ and $P_{cs}$ states. Our results prefer that the SU(3) partners of the observed $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ in the $P_{cs}$ system have not been found yet.

    hep-phhep-exPRD(2022)·32 citations
15. 15*

    A lesson from $R_{\tau \tau }^{K^{(\ast )}}$ and $R_{\nu \nu }^{K^{(\ast )}}$ at Belle II

    Arturo de Giorgi🇪🇸 · Gioacchino Piazza🇫🇷

    Within the assumption of Left-Handed (LH) New Physics (NP), we review the relations between $\mathcal{B}(B\to K^{(\ast )}{\tau }^{+}{\tau }^{-})$ and $\mathcal{B}(B\to K^{(\ast )}\nu \bar{\nu })$ for several Beyond the Standard Model (BSM) scenarios, commonly considered to explain the Lepton flavor Universality (LFU) violation observed in charged and neutral-current semileptonic $B$ decays. We employ the latest $R_{D^{(\ast )}}$ world averages that include the recent LHCb measurement and assess the possibility of simultaneously explaining the $B$-anomalies without spoiling current bounds on di-neutrino and di-tau modes. This is particularly relevant in light of the upcoming results by Belle II on neutrinos and the continuing improvement in accuracy and sensitivity achieved in tau modes.

    hep-phFortsch.Phys.(2024)·15 citations
16. 16*

    Forbidden Dark Matter Combusted Around Supermassive Black Hole

    Yu Cheng🇨🇳 · Shao-Feng Ge🇨🇳 · Xiao-Gang He🇨🇳 · Jie Sheng🇨🇳

    The forbidden dark matter cannot annihilate into a pair of heavier partners, either SM particles or its partners in the dark sector, at the late stage of cosmological evolution by definition. We point out the possibility of reactivating the forbidden annihilation channel around supermassive black holes. Being attracted towards a black hole, the forbidden dark matter is significantly accelerated to overcome the annihilation threshold. The subsequent decay of the annihilation products to photon leaves a unique signal around the black hole, which can serve as a smoking gun for the forbidden dark matter. For illustration, the Fermi-LAT data around Sgr $A^{\ast }$ provides a preliminary constraint on the thermally averaged cross section of the reactivated forbidden annihilation that is consistent with the DM relic density requirement.

    hep-phastro-ph.GAastro-ph.HEhep-exPLB(2023)·14 citations
17. 17*

    Beam functions for $N$-jettiness at N${}^3$LO in perturbative QCD

    Daniel Baranowski🇨🇭 · Arnd Behring🇨🇭 · Kirill Melnikov🇩🇪 · Lorenzo Tancredi🇩🇪 · Christopher Wever🇩🇪

    We present a calculation of all matching coefficients for $N$-jettiness beam functions at next-to-next-to-next-to-leading order (N${}^3$LO) in perturbative quantum chromodynamics (QCD). Our computation is performed starting from the respective collinear splitting kernels, which we integrate using the axial gauge. We use reverse unitarity to map the relevant phase-space integrals to loop integrals, which allows us to employ multi-loop techniques including integration-by-parts identities and differential equations. We find a canonical basis and use an algorithm to establish non-trivial partial fraction relations among the resulting master integrals, which allows us to reduce their number substantially. By use of regularity conditions, we express all necessary boundary constants in terms of an independent set, which we compute by direct integration of the corresponding integrals in the soft limit. In this way, we provide an entirely independent calculation of the matching coefficients which were previously computed in arXiv:2006.03056.

    hep-phJHEP(2023)·25 citations
18. 18*

    Probing new physics at the LHC with $\mathrm{b}\tau \nu$ final states

    Andrés Flórez🇨🇴 · José D. Ruiz Álvarez🇨🇴 · Tomas Atehortua Garces🇨🇴

    The $R_{D^{(\ast )}}$ anomaly is one of the most intriguing experimental results in particle physics today. Experiments such as BaBar, Belle and LHCb have measured a consistent tension with the standard model (SM). We study several extensions of the SM that could potentially explain this tension, such as production of heavy ${\mathrm{W}}^{\prime }$ bosons, under the sequential SM scenario, leptoquarks with preferential couplings to third generation fermions, and interpretations through effective field theories. Such models, are not only able to explain the $R_{D^{(\ast )}}$ anomaly but also to produce distinctive signatures at the LHC. We present different feasibility studies to probe each of these scenarios at the LHC, considering final states with one $\mathrm{b}$-quark candidate, one hadronically decaying tau lepton (${\tau }_h$) and missing transverse momentum ($p_{\mathrm{T}}^{miss}$). The selection criteria has been optimized for each model to achieve best signal signficance. The studies are performed considering different LHC running conditions, at $\sqrt{s}=13\mathrm{TeV}$ and 13.6 $\mathrm{TeV}$, and different luminosities (150~${\mathrm{fb}}^{-1}$ and 3000~${\mathrm{fb}}^{-1}$).

    hep-phPRD(2023)·1 citation
19. 19*

    Snowmass Theory Frontier Report

    N. Craig · C. Csáki · A. X. El-Khadra · Z. Bern · R. Boughezal · S. Catterall · Z. Davoudi · A. de Gouvêa · P. Draper · P. J. Fox · D. Green · D. Harlow and 29 other authors

    This report summarizes the recent progress and promising future directions in theoretical high-energy physics (HEP) identified within the Theory Frontier of the 2021 Snowmass Process.

    hep-phastro-ph.COgr-qchep-lat+114 citations
20. 20*

    NLO computation of diffractive di-hadron production in a saturation framework

    Michael Fucilla🇮🇹 · Andrey V. Grabovsky🇷🇺 · Emilie Li🇫🇷 · Lech Szymanowski🇵🇱 · Samuel Wallon🇫🇷

    The cross-sections of diffractive double hadron photo- or electroproduction with large $p_T$, on a nucleon or a nucleus, are calculated to NLO accuracy. A hybrid formalism mixing collinear factorization and high energy small-$x$ factorization, more precisely the shockwave formalism for the latter, is used to derive the results. The cancellation of divergences is explicitly shown, and the finite parts of the NLO differential cross-sections are found. We work in arbitrary kinematics such that both photoproduction and leptoproduction are considered. The results are therefore usable, to detect saturation effects, at both the future EIC or already at LHC, using Ultra Peripheral Collisions.

    hep-phJHEP(2023)·49 citations
21. 21*

    Constraints on Dark Matter-Electron Scattering from Molecular Cloud Ionization

    Anirudh Prabhu🇺🇸 · Carlos Blanco🇺🇸

    We demonstrate that ionization of ${\text{H}}_2$ by dark matter in dense molecular clouds can provide strong constraints on the scattering strength of dark matter with electrons. Molecular clouds have high UV-optical attenuation, shielding them from ultraviolet and X-ray photons. Their chemical and thermal evolution are governed by low-energy cosmic rays. Dark matter with mass $\gtrsim 4$ MeV can ionize ${\text{H}}_2$, contributing to the observed ionization rate. We require that the dark matter-induced ionization rate of ${\text{H}}_2$ not exceed the observed cosmic ray ionization rate, ${\zeta }^{{\text{H}}_2}$, in diffuse molecular clouds as well as dense molecular clouds such as L1551 in the Taurus cloud complex. This allow us to place strong constraints on the DM-electron cross section, ${\bar{\sigma }}_e$, that complement existing astrophysical constraints and probe the strongly interacting parameter space where terrestrial and underground direct detection experiments lose sensitivity. We show that constraints from molecular clouds combined with planned balloon and satellite-based experiments would strongly constrain the fractional abundance of dark matter that interacts strongly with electrons. We comment on future modeling and observational efforts that may improve our bounds.

    hep-phastro-ph.COPRD(2023)·18 citations
22. 22*

    Indirect Detection of Dark Matter Annihilating into Dark Glueballs

    David Curtin🇨🇦 · Caleb Gemmell🇨🇦

    We examine indirect detection of dark matter that annihilates into dark glueballs, which in turn decay into the Standard Model via a range of portals. This arises if the dark matter candidate couples to a confining gauge force without light flavours, representative of many possible complex dark sectors. Such Hidden Valley scenarios are being increasingly considered due to non-detection of minimal models as well as theoretical motivations such as the Twin Higgs solution to the little hierarchy problem. Study of dark glueballs in indirect detection has previously been hampered by the difficulty of modeling their production in dark showers. We use the recent GlueShower code to produce the first constraints on dark matter annihilating via dark glueballs into the Standard Model across photon, antiproton, and positron channels. We also fit the Galactic Centre Excess and use this observation, combined with other astrophysical constraints, to show how multi-channel observations can constrain UV and IR details of the theory, namely the exact decay portal and hadronization behaviour respectively. This provides unique complementary discovery and diagnostic potential to Hidden Valley searches at colliders. It is interesting to note that thermal WIMPs annihilating to $\mathcal{O}(10\mathrm{GeV})$ dark glueballs and then the Standard Model via the Twin-Higgs-like decay portal can account for the Galactic Centre Excess while respecting other constraints.

    hep-phastro-ph.HEJHEP(2023)·12 citations
23. 23*

    The axion flavour connection

    Luc Darmé🇫🇷 · Enrico Nardi🇮🇹 · Clemente Smarra🇮🇹

    A local flavour symmetry acting on the quarks of the Standard Model can automatically give rise to an accidental global $U(1)$ which remains preserved from sources of explicit breaking up to a large operator dimension, while it gets spontaneously broken together with the flavour symmetry. Such non-fundamental symmetries are often endowed with a mixed QCD anomaly, so that the strong CP problem is automatically solved via the axion mechanism. We illustrate the general features required to realise this scenario, and we discuss a simple construction based on the flavour group $SU(3)\times SU(2)\times U(1{)}_F$ to illustrate how mass hierarchies can arise while ensuring at the same time a high quality Peccei-Quinn symmetry.

    hep-phJHEP(2023)·8 citations
24. 24*

    Antimatter Free-Fall Experiments and Charge Asymmetry

    U. D. Jentschura🇺🇸

    We propose a method by which one could use modified antimatter gravity experiments in order to perform a high-precision test of antimatter charge neutrality. The proposal is based on the application of a strong, external, vertically oriented electric field during an antimatter free-fall gravity experiment in the gravitational field of the Earth. The proposed experimental setup has the potential to drastically improve the limits on the charge-asymmetry parameter ${\overline{ϵ}}_q$ of antimatter. On the theoretical side, we analyze possibilities to describe a putative charge-asymmetry of matter and antimatter, proportional to the parameters ${ϵ}_q$ and ${\overline{ϵ}}_q$, by Lagrangian methods. We found that such an asymmetry could be described by four-dimensional Lorentz-invariant operators that break CPT without destroying the locality of the field theory. The mechanism involves an interaction Lagrangian with field operators decomposed into particle or antiparticle field contributions. Our Lagrangian is otherwise Lorentz, as well as PT invariant. Constraints to be derived on the parameter ${\overline{ϵ}}_q$ do not depend on the assumed theoretical model.

    hep-phSymmetry(2021)·0 citations
25. 25*

    Cosmological tensions in the birthplace of the heliocentric model

    Eleonora Di Valentino🇬🇧 · Emmanuel Saridakis🇬🇷 · Adam Riess🇺🇸

    The theme of tensions in cosmology has become increasingly important in the cosmological community, proving capable of attracting new generations of scientists who want to be there and contribute to the next paradigm shift.

    ↳ astro-ph.COhep-phhep-thNature Astron.(2022)·9 citations
26. 26*

    Exploring sQGP and Small Systems

    Debasish Das🇮🇳

    A strongly interacting Quark-Gluon Plasma (sQGP) is created in the high energy heavy ion collisions at RHIC and LHC. Our present understanding of sQGP as a very good liquid with astonishingly low viscosity is reviewed. With the arrival of the interesting results from LHC in high-energy p+p and p+A, a new endeavour to characterize the transition from these small systems to heavy ions (A+A) is now in place, since, even the small systems showed prominent similarities to heavy ions in the rising multiplicity domains. An outlook of future possibilities for better measurements is also made at the end of this brief review.

    ↳ nucl-exhep-exhep-phhep-th+1Int.J.Mod.Phys.A(2021)·4 citations
27. 27*

    Cosmological impact of microwave background temperature measurements

    L. Gelo · C. J. A. P. Martins🇵🇹 · N. Quevedo · A. M. M. Vieira

    The cosmic microwave background temperature is a cornerstone astrophysical observable. Its present value is tightly constrained, but its redshift dependence, which can now be determined until redshift $z\sim 6.34$, is also an important probe of fundamental cosmology. We show that its constraining power is now comparable to that of other background cosmology probes, including Type Ia supernovae and Hubble parameter measurements. We illustrate this with three models, each based on a different conceptual paradigm, which aim to explain the recent acceleration of the universe. We find that for parametric extension of $\Lambda$CDM the combination of temperature and cosmological data significantly improves constraints on the model parameters, while for alternative models without a $\Lambda$CDM limit this data combination rules them out.

    ↳ astro-ph.COgr-qchep-phPLB(2022)·7 citations
28. 28*

    Constraints on ultra-slow-roll inflation from the third LIGO-Virgo observing run

    Bo Mu🇨🇳 · Gong Cheng🇨🇳 · Jing Liu🇨🇳 · Zong-Kuan Guo🇨🇳

    The nonattractor evolution in ultra-slow-roll (USR) inflation results in the amplification of superhorizon curvature perturbations and then induces a strong and detectable stochastic gravitational wave background. In this letter, we search for such a stochastic gravitational wave background in data from the third LIGO-Virgo observing run and place constraints on the USR inflationary models. The $e$-folding number of the USR phase are constrained to be $\Delta N\lesssim 2.9$ at the 95% confidence level and the power spectrum of curvature perturbations amplified during the USR phase is constrained to be ${\log }_{10}{P}_{R\mathrm{p}}<-1.7$ at the scales $2.9\times 10^5\mathrm{p}{\mathrm{c}}^{-1}\lesssim k\lesssim 1.7\times 10^{11}\mathrm{p}{\mathrm{c}}^{-1}$. Besides, we forecast the ability of future experiments to constrain USR inflation, and find $P_{R\mathrm{p}}\lesssim 10^{-3.6}$ for LISA and Taiji, $P_{R\mathrm{p}}\lesssim 10^{-3.3}$ for Cosmic Explore and Einstein Telescope, $P_{R\mathrm{p}}\lesssim 10^{-5.5}$ for DECIGO and Big Bang Observer and $P_{R\mathrm{p}}\lesssim 10^{-5.2}$ for Square Kilometre Array.

    ↳ astro-ph.COgr-qchep-phPRD(2023)·20 citations
29. 29*

    Quantum Algorithm for Querying Causality of Multiloop Scattering Amplitudes

    Selomit Ramírez-Uribe🇪🇸

    The first application of a quantum algorithm to Feynman loop integrals is reviewed. The connection between quantum computing and perturbative quantum field theory is feasible due to fact that the two on-shell states of a Feynman propagator are naturally encoded in a qubit. The particular problem to be addressed is the identification of the causal singular configurations of multiloop Feynman diagrams. The identification of such configurations is carried out through the implementation of a modified Grover's quantum algorithm for querying multiple solutions over unstructured datasets.

    ↳ quant-phhep-phhep-thPoS·1 citation
30. 30*

    Scaling solutions for asymptotically free quantum gravity

    Saswato Sen🇯🇵 · Christof Wetterich🇩🇪 · Masatoshi Yamada🇩🇪

    We compute scaling solutions of functional flow equations for quantum gravity in a general truncation with up to four derivatives of the metric. They connect the asymptotically free ultraviolet fixed point, which is accessible to perturbation theory, to the non-perturbative infrared region. The existence of such scaling solutions is necessary for a renormalizable quantum field theory of gravity. If the proposed scaling solution is confirmed beyond our approximations asymptotic freedom is a viable alternative to asymptotic safety for quantum gravity.

    ↳ hep-thgr-qchep-phJHEP(2023)·7 citations
31. 31*

    Primordial Black Holes

    Albert Escrivà🇧🇪 · Florian Kuhnel🇩🇪 · Yuichiro Tada🇯🇵

    Aspects of primordial black holes, i.e. black holes formed in the early Universe, are reviewed. Special emphasis is put on their formation, their role as dark matter candidates and their manifold signatures, particularly through gravitational waves.

    ↳ astro-ph.COgr-qchep-phhep-thChapter 4 - Primordial black holes, Edito…·348 citations
32. 32*

    Bounds on photon scattering

    Kelian Häring🇨🇭 · Aditya Hebbar🇫🇷 · Denis Karateev🇨🇭 · Marco Meineri🇨🇭 · João Penedones🇨🇭

    We study 2-to-2 scattering amplitudes of massless spin one particles in $d=4$ space-time dimensions, like real world photons. We define a set of non-perturbative observables (Wilson coefficients) which describe these amplitudes at low energies. We use full non-linear unitarity to construct various novel numerical bounds on these observables. For completeness, we also rederive some bounds using positivity only. We discover and explain why some of these Wilson coefficients cannot be bounded.

    ↳ hep-thhep-phJHEP(2024)·65 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.