Mon·Nov 15, 2021Monday·November 15, 2021

1. 01*

   Estimating QCD-factorization amplitudes through $SU(3)$ symmetry in $B\to PP$ decays

   Tobias Huber🇩🇪 · Gilberto Tetlalmatzi-Xolocotzi🇩🇪

   We estimate the potential size of the weak annihilation amplitudes in QCD factorization as allowed by experimental data. To achieve this goal, we establish a connection between the amplitudes in the QCD factorization and the so-called topological and $SU(3)$-invariant descriptions. Our approach is based purely on the analysis of the tensor structure of the decay amplitudes. By focusing on the processes $B\to PP$ and considering data from CP asymmetries and branching fractions, we perform a global fit to the $SU(3)$-irreducible quantities assuming minimal theoretical bias. Subsequently we translate the outcome to the QCD factorization decomposition, and find that the most constrained weak annihilation amplitudes are below $4\%$. However, in view of the large uncertainties in several of the experimental input parameters, values up to $30\%$ are allowed in certain cases.

   hep-phhep-exEPJC(2022)·36 citations
2. 02*

   Two-body hadronic decay of $K^{+}$ in the presence of a circularly polarized laser field

   M Baouahi🇲🇦 · I Dahiri🇲🇦 · M Ouali🇲🇦 · B Manaut🇲🇦 · R Benbrik🇲🇦 · S Taj🇲🇦

   In this study, we have investigated the two-body hadronic decay of the charged kaon, $K^{+}\to {\pi }^{+}+{\pi }^0$, in the presence of a laser field with circular polarization. We have derived, by analytical techniques, the laser-assisted decay width and the branching ratio of the charged kaon decay via the two-body hadronic channel. We have also taken into consideration the impressive results obtained for the laser-assisted charged kaon decay via the leptonic mode in order to understand more clearly the effect of the laser field on the quantities related to the charged kaon decay such as the decay width, the branching ratio and lifetime. A precise comparison of the ratios of hadronic to muonic decay in the presence of the laser field is made to show that the hadronic mode becomes slightly more important by increasing the laser field intensity.

   hep-phEPL(2022)·14 citations
3. 03*

   Semileptonic transitions: $B_{(s)}\to \pi (K)$; $D_s\to K$; $D\to \pi ,K$; and $K\to \pi$

   Zhao-Qian Yao🇨🇳 · Daniele Binosi🇮🇹 · Zhu-Fang Cui🇨🇳 · Craig D. Roberts🇨🇳

   Continuum Schwinger function methods for the strong-interaction bound-state problem are used to arrive at a unified set of parameter-free predictions for the semileptonic $K\to \pi$, $D\to \pi ,K$ and $D_s\to K$, $B_{(s)}\to \pi (K)$ transition form factors and the associated branching fractions. The form factors are a leading source of uncertainty in all such calculations: our results agree quantitatively with available data and provide benchmarks for the hitherto unmeasured $D_s\to K^0$, ${\bar{B}}_s\to K^{+}$ form factors. The analysis delivers a value of $|V_{cs}|=0.974(10)$ and also predictions for all branching fraction ratios in the pseudoscalar meson sector that can be used to test lepton flavour universality. Quantitative comparisons are provided between extant theory and the recent measurement of ${\mathcal{B}}_{B_s^0\to K^{-}{\mu }^{+}{\nu }_{\mu }}$. Here, further, refined measurements would be useful in moving toward a more accurate value of $|V_{ub}|$.

   hep-phhep-exhep-latnucl-ex+1PLB(2022)·19 citations
4. 04*

   Gluon Quasi Particles and the CGC Density Matrix

   Haowu Duan🇺🇸 · Alex Kovner🇺🇸 · Vladimir V. Skokov🇺🇸

   We revisit and extend the calculation of the density matrix and entanglement entropy of a Color Glass Condensate by including the leading saturation corrections in the calculation. We show that the density matrix is diagonal in the quasi particle basis, where it has the Boltzmann form. The quasi particles in a wide interval of momenta behave as massless two-dimensional bosons with the temperature proportional to the typical semi-hard scale $T=Q_s/\sqrt{{\alpha }_s{N}_c}$. Thus the semi-hard momentum region $Q_s<k<Q_s/\sqrt{{\alpha }_s{N}_c}$ arises as a well-defined intermediate regime between the perturbatively hard momenta and the nonperturbative soft momenta $k<Q_s$ in the CGC description of a hadronic wave function.

   hep-phPRD(2022)·18 citations
5. 05*

   $DK$ and $BK$-like spectra from Laplace sum rule at NLO

   S. Narison🇫🇷 · A. Rabemananjara🇲🇬 · D. Rabetiarivony🇲🇬

   Encouraged by the agreement, with the recent LHCb data on the $D^{-}{K}^{+}$ invariant mass from $B\to D^{+}{D}^{-}{K}^{+}$ decay, of our results for the masses of the $0^{+}$ and $1^{-}$ open charm $(\bar{c}\bar{d})(us)$ tetraquarks and molecules states from QCD spectral sum rules within stability criteria, which we review here, we extend our analysis to the $b$-quark channel. We find, in the $0^{+}$ case the lowest mass $M_{BK}=5195(15)\mathrm{MeV}$ with $f_{BK}=8.3(2.4)\mathrm{keV}$ and three (almost) degenerate states having respectively the masses $M_{SS}=5702(60)\mathrm{MeV}$, $M_{AA}=5661(75)\mathrm{MeV}$ and $M_{B^{\ast }{K}^{\ast }}=5720(71)\mathrm{MeV}$ and couplings $f_{SS}=22.2(2.3)\mathrm{keV}$, $f_{AA}=30.1(3.1)\mathrm{keV}$ and $f_{B^{\ast }{K}^{\ast }}=26.5(2.8)\mathrm{keV}$, from which we can associate a scalar tetramole with $M_{{\mathcal{T}}_{{\mathcal{M}}_0}}=5694(69)\mathrm{MeV}\text{and}{f}_{{\mathcal{T}}_{{\mathcal{M}}_0}}=26.5(2.7)\mathrm{keV}$. In the spin 1 case, we find four (almost) degenerate states associated with a tetramole having $M_{{\mathcal{T}}_{{\mathcal{M}}_1}}=5700(81)\mathrm{MeV}\text{and}{f}_{{\mathcal{T}}_{{\mathcal{M}}_1}}=16.2(2.6)\mathrm{keV}$. For the first radial excitation of the $BK$ molecule, we have $M_{(BK{)}_1}=6265(146)\mathrm{MeV}$ and $f_{(BK{)}_1}=22.8(3.2)\mathrm{keV}$ . For the remaining states, we associate a scalar and vector tetramoles having respectively $M_{(T_{{\mathcal{M}}_0}{)}_1}=7439(314)\mathrm{MeV},f_{(T_{{\mathcal{M}}_0}{)}_1}=74.7(8.4)\mathrm{keV}$ and $M_{(T_{{\mathcal{M}}_1}{)}_1}=7544(345)\mathrm{MeV},f_{(T_{{\mathcal{M}}_1}{)}_1}=33.0(6.7)\mathrm{keV}$.

   hep-phNucl.Part.Phys.Proc.(2022)·2 citations
6. 06*

   Searching for Charged Higgs Bosons via $e^{+}{e}^{-}\to H^{+}{H}^{-}\to c\bar{b}\bar{c}b$ at Linear Colliders

   Wei-Shu Hou🇹🇼 · Rishabh Jain🇹🇼 · Tanmoy Modak🇩🇪

   We study a search for the charged Higgs boson via $e^{+}{e}^{-}\to H^{+}{H}^{-}\to c\bar{b}\bar{c}b$ at the 500 GeV ILC. In a general two Higgs doublet model without $Z_2$ symmetry, extra Yukawa couplings ${\rho }_{tt}$ and ${\rho }_{tc}$ can drive baryogenesis, but searches at the HL-LHC may still go empty-handed if the couplings are relatively weak. Taking $m_{H^{+}}\simeq m_H\simeq m_A\simeq 200$ GeV, with ${\rho }_{tt}$, ${\rho }_{tc}\sim 0.1$ and no $h(125)$-$H$ mixing, $H^{+}\to c\bar{b}$ decay is dominant, and the $c\bar{b}\bar{c}b$ final state is likely overwhelmed by QCD background at the LHC. We show that the electroweak production of $H^{+}{H}^{-}$ at the ILC is discoverable with integrated luminosity of 1 ab${}^{-1}$. Furthermore, we show that $m_{H^{+}}$ can be extracted by requiring the two pairs of $b$ and light jets be roughly equal in mass, without assuming the mass value. Thus, ILC can probe low mass Higgs bosons in multijet final states to complement HL-LHC in the future

   hep-phhep-exJHEP(2022)·8 citations
7. 07*

   Quark-mass and $1/N_c$ corrections to the vector-meson pseudoscalar-meson photon ($VP\gamma$) interaction

   H. C. Lange🇩🇪 · A. Krasniqi🇩🇪 · S. Scherer🇩🇪

   We analyze quark-mass and $1/N_c$ corrections to all of the radiative transitions between the vector-meson nonet and the pseudoscalar-meson nonet within a chiral effective Lagrangian approach. We perform fits of the available coupling constants to experimental data and discuss the corresponding approximations. In terms of five (six) coupling constants, we obtain a reasonably good description of the 12 experimental decay rates.

   hep-phnucl-thPRD(2022)·2 citations
8. 08*

   Deep inelastic scattering with proton target in the presence of gluon condensation using holography

   Sara Tahery🇨🇳 · Xiaopeng Wang🇨🇳 · Xurong Chen🇨🇳

   We study the deep inelastic scattering (DIS) of a proton-targeted lepton in the presence of gluon condensation using gauge/gravity duality. We use a modified $Ad{S}_5$ background where the modification parameter $c$ corresponds to the gluon condensation in the boundary theory. Firstly, when examining the electromagnetic field, we find that non-zero $c$ can increase the magnitude of the field. Our goal is to find the acceptable value of $c$ for this scattering and our method is based on setting the mass of the proton as an eigenvalue of the baryonic state equations of the DIS to find the acceptable value of the parameter c on the other side of the equations. Therefore in the second step, we calculate wave function equations for the baryonic states where the mass of the proton target requires a value contribution of $c$ as $c=0.0120{\mathrm{GeV}}^4$. Proceeding by the electromagnetic field and the baryonic states, we derive the holographic interaction action related to the amplitude of the scattering. Finally, we compute the corresponding structure functions numerically as functions of $x$ and $q$, which are Bjorken variables and the lepton momentum transfers, respectively. Comparing the Jlab Hall $C$ data with our theoretical calculations, our results are acceptable.

   hep-phhep-thCPC·3 citations
9. 09*

   Range correction in the weak-binding relation for unstable states

   Tomona Kinugawa🇯🇵 · Tetsuo Hyodo🇯🇵

   The compositeness is defined as the weight of the hadronic molecule in the hadron wave function. We can determine the internal structure of the weak-binding system without any specific models from the compositeness. In order to estimate the compositeness of the system with a large effective range, we introduce the range correction to Weinberg's weak-binding relation by modifying the correction terms. We study the applicability of the weak-binding relations by the numerical calculation and show that the improved relation can be applied to a larger parameter region compared with the previous one.

   hep-phnucl-thPoS(2022)·3 citations
10. 10*

    Production of dileptons via photon-photon fusion in proton-proton collisions with one forward proton measurement

    Antoni Szczurek🇵🇱 · Barbara Linek🇵🇱 · Marta Luszczak🇵🇱

    We discuss the mechanism of dilepton production in proton-proton scattering via fusion of virtual photons with identification of one proton on either side. This is relevant for the ATLAS+AFP and CMS+PPS at the LHC. Transverse momenta of the photons are taken into account via photon unintegrated fluxes. The latter ones are expressed in terms of proton electromagnetic form factors and structure functions. We include different categories of such processes (double elastic, single dissociative). Some differential distributions are shown explicitly and differences with respect to the results without proton identification are discussed. A soft gap survival factor is calculated using SuperChic-4 code.

    hep-phPoS(2022)·1 citation
11. 11*

    Effective color charge in high temperaure gluon plasma at A_0 background

    V. Skalozub🇺🇦

    In high temperature SU(2) gluodynamics, in a relativistic background R^{ext.}_xi gauge, the effective color charge (g^2(A_0))_eff. is calculated in the presence of the A_0 condensate which is related to Polyakov's loop and also serves as the order parameter of the deconfinement phase transition at high temperature. The gauge-invariant value of the condensate ((A_0)^cl)_0 is obtained from the two-loop effective potential of order parameter W_L(A_0^cl) which is independent of the gauge-fixing parameter xi and has a nontrivial minimum position. Due to smallness of the expansion parameter ~ g^2/(8 pi^2), this potential is applicable at high temperatures beginning from the deconfinement temperature T_d. The effective charge accounts for a correlation between the one- and the two-loop terms of the W_L(A_0^cl). It results in decreasing of the effective gluon interactions in the plasma, compared to the zero condensate case. Temperature dependence of (g^2(A_0))_eff. is investigated. The importance of the found dependence for different applications is noted.

    hep-ph0 citations
12. 12*

    Hide and Seek with the Third Family Hypercharge Model's $Z^{\prime }$ at the Large Hadron Collider

    Ben Allanach🇬🇧 · Hannah Banks🇬🇧

    The Third Family Hypercharge Model predicts a $Z^{\prime }$ gauge boson with flavour dependent couplings which has been used to explain anomalies in meson decay processes which involve the $b\to s{\mu }^{+}{\mu }^{-}$ transition. The model predicts that a TeV-scale $Z^{\prime }$ should decay to particle-antiparticle pairs of muons, taus, top quarks and bottom quarks with appreciable branching ratios. We reinterpret various ATLAS and CMS search limits for $Z^{\prime }$ production followed by such decays at the LHC over a parameter space of the model that results from a successful combined fit to the $b\to s{l}^{+}{l}^{-}$ data and precision electroweak observables. Current exclusions in parameter space and expected sensitivities of the various different channels in the high-luminosity run are compared. We find that the high-luminosity run of the LHC will significantly increase the sensitivity to the model beyond the existing observational limits, which we find to be surprisingly weak.

    hep-phhep-exEPJC(2022)·9 citations
13. 13*

    Non-thermally trapped inflation by tachyonic dark photon production

    Naoya Kitajima🇯🇵 · Shota Nakagawa🇯🇵 · Fuminobu Takahashi🇯🇵

    We show that a dark Higgs field charged under U(1)${}_{\mathrm{H}}$ gauge symmetry is trapped at the origin for a long time, if dark photons are produced by an axion condensate via tachyonic preheating. The trapped dark Higgs can drive late-time inflation, producing a large amount of entropy. Unlike thermal inflation, the dark Higgs potential does not have to be very flat, because the effective mass for the dark Higgs is enhanced by large field values of dark photons with extremely low momentum. After inflation, the dark Higgs decays into massive dark photons, which further decay into the SM particles through a kinetic mixing. We show that a large portion of the viable parameter space is within the future experimental searches for the dark photon, because the kinetic mixing is bounded below for successful reheating. We also comment on the Schwinger effect which can hamper the tachyonic production of dark photons, when the mass of dark photon is not the Stückelberg mass, but is generated by the Higgs mechanism. Such non-thermal trapped inflation could be applied to other cosmological scenarios such as the early dark energy, known as one of the solutions to the Hubble tension.

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

    Correlations between quark mass and flavor mixing hierarchies

    Harald Fritzsch🇩🇪 · Zhi-zhong Xing🇨🇳 · Di Zhang🇨🇳

    We calculate the quark flavor mixing matrix $V$ based on the Hermitian quark mass matrices $M_{\mathrm{u}}^{}$ and $M_{\mathrm{d}}^{}$ with vanishing $(1,1)$, $(1,3)$ and $(3,1)$ entries. The popular leading-order prediction $|V_{ub}^{}/V_{cb}^{}|\simeq \sqrt{m_u^{}/m_c^{}}$ is significantly modified, and the result agrees with the current experimental value. We find that behind the strong {\it mass} hierarchy of up- or down-type quarks is the weak {\it texture} hierarchy of $M_{\mathrm{u}}^{}$ or $M_{\mathrm{d}}^{}$ characterized by an approximate seesaw-like relation among its $(2,2)$, $(2,3)$ and $(3,3)$ elements.

    hep-phhep-exNPB(2022)·19 citations
15. 15*

    Dissecting axion and dark photon with a network of vector sensors

    Yifan Chen🇨🇳 · Min Jiang🇨🇳 · Jing Shu🇨🇳 · Xiao Xue🇩🇪 · Yanjie Zeng🇨🇳

    We develop formalisms for a network of vector sensors, sensitive to certain spatial components of the signals, to identify the properties of a light axion or a dark photon background. These bosonic fields contribute to vector-like signals in the detectors, including effective magnetic fields triggering the spin precession, effective electric currents in a shielded room, and forces on the matter. The interplay between a pair of vector sensors and a baseline that separates them can potentially uncover rich information of the bosons, including angular distribution, polarization modes, source localization, and macroscopic circular polarization. Using such a network, one can identify the microscopic nature of a potential signal, such as distinguishing between the axion-fermion coupling and the dipole couplings with the dark photon.

    hep-phastro-ph.COhep-exPRResearch(2022)·25 citations
16. 16*

    Studying dark matter with MadDM: lines and loops

    Daniele Massaro🇧🇪 · Chiara Arina🇧🇪 · Jan Heisig🇧🇪 · Fabio Maltoni🇧🇪 · Olivier Mattelaer🇧🇪

    Automated tools for the computation of amplitudes and cross sections have become the backbone of phenomenological studies beyond the standard model. We present the latest developments in MadDM, a calculator of dark-matter observables based on MadGraph5_aMC@NLO. The new version enables the fully automated computation of loop-induced annihilation processes, relevant for indirect detection of dark matter. Of particular interest is the direct annihilation into photons, $\gamma \gamma ,\gamma X$. These processes lead to monochromatic gamma-ray lines that are smoking-gun signatures for dark-matter annihilation in our Galaxy. MadDM computes the predictions for the expected photon fluxes near Earth and derives constraints from the gamma-ray line searches by Fermi-LAT and HESS. As an application, we present the implications for the parameter space of the Inert Doublet Model.

    hep-phJ.Phys.Conf.Ser.(2021)·0 citations
17. 17*

    The QCD Adler function and the muon $g-2$ anomaly from renormalons

    Alessio Maiezza🇭🇷 · Juan Carlos Vasquez🇺🇸

    We describe the Adler function in Quantum Chromodynamics using a transseries representation within a resurgent framework. The approach is based on a Borel-Ecalle resummation of the infrared renormalons combined with an effective running for the strong coupling. The new approach is flexible enough to give values in agreement with the current Adler function determinations. We then apply our finding to the muon's anomalous magnetic moment studying the possibility of saturating, solely in terms of the vacuum polarization function, the current discrepancy between the best Standard Model value for the muon's anomalous magnetic moment and the experimental value obtained by the most recent muon g-2 collaboration. The latter shows that the Adler function's new representation can also be consistent with recent lattice determinations.

    hep-phhep-lathep-thSymmetry(2022)·7 citations
18. 18*

    Short-Distance Structure of Unpolarized Gluon Pseudodistributions

    Ian Balitsky🇺🇸 · Wayne Morris🇺🇸 · Anatoly Radyushkin🇺🇸

    We present the results that form the basis for calculations of the unpolarized gluon parton distributions (PDFs) using the pseudo-PDF approach. We give the results for the most complicated box diagram both for gluon bilocal operators with arbitrary indices, and for combinations of indices corresponding to three matrix elements that are most convenient to extract the twist-2 invariant amplitude. We also present detailed results for the gluon-quark transition diagram. The additional results for the box diagram and the gluon-quark contribution may be used for extractions of the gluon PDF from different matrix elements, with a possible cross-check of the results obtained in this way.

    hep-phhep-latPRD(2022)·18 citations
19. 19*

    Manifesting hidden dynamics of a sub-component dark matter

    Ayuki Kamada🇰🇷 · Hee Jung Kim🇰🇷 · Jong-Chul Park🇰🇷 · Seodong Shin🇰🇷

    We emphasize the distinctive cosmological dynamics in multi-component dark matter scenarios and its impact in probing a sub-dominant component of dark matter. We find that the thermal evolution of the sub-component dark matter is significantly affected by the sizable self-scattering that is naturally realized for sub-$\mathrm{GeV}$ masses. The required annihilation cross section for the sub-component sharply increases as we consider a smaller relative abundance fraction among the dark-matter species. Therefore, contrary to a naive expectation, it can be easier to detect the sub-component with smaller abundance fractions in direct/indirect-detection experiments and cosmological observations. Combining with the current results of accelerator-based experiments, the abundance fractions smaller than $10\%$ are strongly disfavored; we demonstrate this by taking a dark photon portal scenario as an example. Nevertheless, for the abundance fraction larger than $10\%$, the warm dark matter constraints on the sub-dominant component can be complementary to the parameter space probed by accelerator-based experiments.

    hep-phastro-ph.COJCAP(2022)·18 citations
20. 20*

    Constraints on leptoquarks from lepton-flavour-violating tau-lepton processes

    Tomas Husek (Lund U.)🇸🇪 · Kevin Monsalvez-Pozo🇪🇸 · Jorge Portoles (IFIC, Valencia)🇪🇸

    Leptoquarks are ubiquitous in several extensions of the Standard Model and seem to be able to accommodate the universality-violation-driven $B$-meson-decay anomalies and the $(g-2{)}_{\mu }$ discrepancy interpreted as deviations from the Standard Model predictions. In addition, the search for lepton-flavour violation in the charged sector is, at present, a major research program that could also be facilitated by the dynamics generated by leptoquarks. In this article, we consider a rather wide framework of both scalar and vector leptoquarks as the generators of lepton-flavour violation in processes involving the tau lepton. We single out its couplings to leptoquarks, thus breaking universality in the lepton sector, and we integrate out leptoquarks at tree level, generating the corresponding dimension-6 operators of the Standard Model Effective Field Theory. In Ref. [1] we obtained model-independent bounds on the Wilson coefficients of those operators contributing to lepton-flavour-violating hadron tau decays and $\ell$-$\tau$ conversion in nuclei, with $\ell =e,\mu$. Hence, we use those results to translate the bounds into the couplings of leptoquarks to the Standard Model fermions.

    hep-phhep-exJHEP(2022)·14 citations
21. 21*

    Search for oscillations of fundamental constants using molecular spectroscopy

    R. Oswald🇩🇪 · A. Nevsky🇩🇪 · V. Vogt🇩🇪 · S. Schiller🇩🇪 · N. L. Figueroa🇩🇪 · K. Zhang🇩🇪 · O. Tretiak🇩🇪 · D. Antypas🇩🇪 · D. Budker🇩🇪 · A. Banerjee🇮🇱 · G. Perez🇮🇱

    A possible implication of an ultralight dark matter (UDM) field interacting wibeginth the Standard Model (SM) degrees of freedom is oscillations of fundamental constants. Here, we establish direct experimental bounds on the coupling of an oscillating UDM field to the up, down, and strange quarks and to the gluons, for oscillation frequencies between 10 Hz and 10^8 Hz. We employ spectroscopic experiments that take advantage of the dependence of molecular transition frequencies on the nuclear masses. Our results apply to previously unexplored frequency bands, and improve on existing bounds at frequencies > 5 MHz. We identify a sector of UDM - SM coupling space where the bounds from Equivalence Principle tests may be challenged by next-generation experiments of the present kind.

    hep-phphysics.atom-phPRL(2022)·73 citations
22. 22*

    Simulation of energy transport by dark matter scattering in stars

    Hannah Banks🇬🇧 · Siyam Ansari🇬🇧 · Aaron C. Vincent🇨🇦 · Pat Scott🇬🇧

    Asymmetric dark matter (ADM) that is captured in stars can act as an efficient conductor of heat. Small ADM-induced changes in a star's temperature gradient are known to alter neutrino fluxes and asteroseismological signatures, erase convective cores and modify a star's main sequence lifetime. The Sun's proximity to us makes it an ideal laboratory for studying these effects. However, the two formalisms commonly used to parametrize such heat transport were developed over 30 years ago, and calibrated with a single set of simulations. What's more, both are based on assumptions that break down at the Knudsen transition, where heat transport is maximized. We construct a Monte Carlo simulation to exactly solve the Boltzmann collision equation, determining the steady-state distribution and luminosity carried in stars by ADM with cross sections that depend on velocity and momentum. We find that, although the established (Gould and Raffelt) formalism based on local thermal equilibrium does well for constant cross sections, the isothermal (Spergel and Press) method actually performs better across all models with a simple, universal rescaling function. Based on simulation results, we provide recommendations on the parametrization of DM heat transport in stellar evolution models.

    hep-phastro-ph.SRJCAP(2022)·17 citations
23. 23*

    Dirac Radiative Neutrino Mass with Modular Symmetry and Leptogenesis

    Arnab Dasgupta🇺🇸 · Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷 · Oleg Popov🇰🇷 · Morimitsu Tanimoto🇯🇵

    Minimalistic Dirac radiative neutrino mass model based on modular symmetry is proposed. We predict maximum number of observables possible including neutrino mass splittings, neutrino mass scale, lepton mixing angles, and Dirac phases in the leptonic sector with minimum number of input parameters possible. Model is capable of accommodating multicomponent dark matter, thanks to the $\text{R}-$parity and accidental scotogenic ${\mathbb{Z}}_2$ discrete symmetry. Furthermore, even-though neutrinos are Dirac in our model, matter-antimatter asymmetry of the Universe is achieved via neutrinogenesis mechanism. Phenomenology of the dark sector including various dark matter candidates is briefly discussed.

    hep-phhep-th31 citations
24. 24*

    Online-compatible Unsupervised Non-resonant Anomaly Detection

    Vinicius Mikuni🇺🇸 · Benjamin Nachman🇺🇸 · David Shih🇺🇸

    There is a growing need for anomaly detection methods that can broaden the search for new particles in a model-agnostic manner. Most proposals for new methods focus exclusively on signal sensitivity. However, it is not enough to select anomalous events - there must also be a strategy to provide context to the selected events. We propose the first complete strategy for unsupervised detection of non-resonant anomalies that includes both signal sensitivity and a data-driven method for background estimation. Our technique is built out of two simultaneously-trained autoencoders that are forced to be decorrelated from each other. This method can be deployed offline for non-resonant anomaly detection and is also the first complete online-compatible anomaly detection strategy. We show that our method achieves excellent performance on a variety of signals prepared for the ADC2021 data challenge.

    ↳ cs.LGhep-exhep-phphysics.acc-ph+1PRD(2022)·44 citations
25. 25*

    Quasinormal modes of the Hayward black hole surrounded by quintessence: scalar, electromagnetic and gravitational perturbations

    Omar Pedraza🇲🇽 · L. A. López🇲🇽 · R. Arceo🇲🇽 · I. Cabrera-Munguia🇲🇽

    We study the quasi-normal modes for scalar, electromagnetic, and gravitational axial perturbations in the Hayward regular black hole surrounded by quintessence (HBH-${\omega }_q$). Using the third--order WKB approximation we can determine the dependence of the quasi--normal modes on the parameters of the regular black hole and the parameters on the test fields. We also determine the greybody factor, giving transmission and reflection coefficients of the scattered wave through the effective potentials in the WKB approximation using numerical analysis.

    ↳ gr-qchep-phMod.Phys.Lett.A(2022)·26 citations
26. 26*

    Gauge Symmetry Restoration by Higgs Condensation in Flux Compactifications on Coset Spaces

    Satoshi Iso🇯🇵 · Noriaki Kitazawa🇯🇵 · Takao Suyama🇯🇵

    Extra-dimensional components of gauge fields in higher-dimensional gauge theories will play a role of the Higgs field and become tachyonic after Kaluza-Klein compactifications on internal spaces with (topologically nontrivial) gauge field backgrounds. Its condensation is then expected to break gauge symmetries spontaneously. But, contrary to the expectation, some models exhibit restoration of gauge symmetries. In this paper, by considering all the massive Kaluza-Klein excitations of gauge fields, we explicitly show that some of them indeed become massless at the minimum of the Higgs potential and restore (a part of) the gauge symmetries which are broken by gauge field backgrounds. We particularly consider compactifications on $S^2$ with monopole-like fluxes and also on ${\mathbb{CP}}^2$ with instanton and monopole-like fluxes. In some cases, the gauge symmetry is fully restored, as argued in previous literature. In other cases, there is a stable vacuum with a partial restoration of the gauge symmetry after Higgs condensation. Topological structure of the gauge field configurations prevent the gauge symmetries to be restored.

    ↳ hep-thhep-phPRD(2022)·1 citation
27. 27*

    The flux tube profile in full QCD

    M. Baker🇺🇸 · V. Chelnokov🇩🇪 · L. Cosmai🇮🇹 · F. Cuteri🇩🇪 · A. Papa🇮🇹

    We measure the spatial distribution of all components of the color fields surrounding a static quark antiquark pair in QCD with (2+1) HISQ flavors. We isolate the nonperturbative component of the longitudinal chromoelectric color field responsible for the linear term in the confining potential.

    ↳ hep-lathep-phPoS(2022)·5 citations
28. 28*

    Interplay of beam polarisation and systematic uncertainties at future $e^{+}{e}^{-}$ colliders

    Jakob Beyer (1 and 2)🇩🇪 · Jenny List (1) ((1) Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany, (2) Universität Hamburg, Hamburg, Germany)🇩🇪

    Future high-energy $e^{+}{e}^{-}$ colliders will provide some of the most precise tests of the Standard Model. Statistical uncertainties on electroweak precision observables and triple gauge couplings are expected to improve by orders of magnitude over current measurements. This provides a new challenge in accurately assessing and minimising the impact of systematic uncertainties. Beam polarisation may hold a unique potential to isolate and determine the size of systematic effects. So far, studies have mainly focused on the statistical improvements from beam polarisation. This study aims to assess, for the first time, its impact on systematic uncertainties. A combined fit of precision observables, such as chiral fermion couplings and anomalous triple gauge couplings, together with experimental systematic effects is performed on generator-level differential distribution of 2-fermion and 4-fermion final-states. Different configurations of available beam polarisations and luminosities are tested with and without systematic effects, and will be discussed in the context of the existing projections on fermion and gauge boson couplings from detailed experimental simulations.

    ↳ hep-exhep-phPoS(2022)·2 citations
29. 29*

    All-multiplicity amplitudes with four massive quarks and identical-helicity gluons

    Achilleas Lazopoulos🇨🇭 · Alexander Ochirov🇬🇧 · Canxin Shi🇩🇪

    We explore the on-shell recursion for tree-level scattering amplitudes with massive spinning particles. Based on the factorization structure encoded in the same way by two different recursion relations, we conjecture an all-multiplicity formula for two gauged massive particles of arbitrary spin and any number of identical-helicity gluons. Specializing to quantum chromodynamics (QCD), we solve the on-shell recursion relations in the presence of two pairs of massive quarks and an arbitrary number of identical-helicity gluons. We find closed-form expressions for the two distinct families of color-ordered four-quark amplitudes, in which all gluons comprise a single color-adjacent set. We compare the efficiency of the numerical evaluation of the two resulting analytic formulae against a numerical implementation of the off-shell Berends-Giele recursion. We find the formulae for both amplitude families to be faster for large multiplicities, while the simpler of the two is actually faster for any number of external legs. Our analytic results are provided in a computer-readable format as two ancillary files.

    ↳ hep-thhep-phJHEP(2022)·21 citations
30. 30*

    Celestial IR divergences in general most-subleading-color gluon and gravity amplitudes

    Horatiu Nastase🇧🇷 · Francisco Rojas🇨🇱 · Carlos Rubio🇨🇱

    Gluon amplitudes at most-subleading order in the $1/N$ expansion share a remarkable simplicity with graviton amplitudes: collinear divergences are completely absent in both and, as a consequence, their full IR behavior arises from soft gluon/graviton exchange among the external states. In this paper we study the effect of all-loop IR divergences of celestial most-subleading color gluon amplitudes and their similarities with the celestial gravity case. In particular, a simple celestial exponentiation formula for the dipole part can be written. We also analize how this exponentiation is modified by non-dipole contributions. Finally we also show that, in the Regge limit, the soft factor satisfies the Knizhnik-Zamolodchikov equation hinting at the possibility that, in this limit, an effective Wess-Zumino-Witten model would describe the dynamics of the infrared sector.

    ↳ hep-thhep-phJHEP(2022)·14 citations
31. 31*

    Chaotic dynamics of a suspended string in a gravitational background with magnetic field

    Pietro Colangelo🇮🇹 · Floriana Giannuzzi🇮🇹 · Nicola Losacco🇮🇹

    We study the effects of a magnetic field on the chaotic dynamics of a string with endpoints on the boundary of an asymptotically AdS${}_5$ space with black hole. We study Poincaré sections and compute the Lyapunov exponents for the string perturbed from the static configuration, for two different orientations, with position of the endpoints on the boundary orthogonal and parallel to the magnetic field. We find that the magnetic field stabilizes the string dynamics, with the largest Lyapunov exponent remaining below the Maldacena-Shenker-Stanford bound.

    ↳ hep-thhep-phPLB(2022)·12 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.