Thu·Oct 21, 2021Thursday·October 21, 2021

1. 01*

   $m_b$ at $m_H$: the running bottom quark mass and the Higgs boson

   Javier Aparisi🇪🇸 · Juan Fuster🇪🇸 · André Hoang🇦🇹 · Adrián Irles🇪🇸 · Christopher Lepenik🇦🇹 · Germán Rodrigo🇪🇸 · Michael Spira🇨🇭 · Seidai Tairafune🇯🇵 · Marcel Vos🇪🇸 · Hitoshi Yamamoto🇪🇸 · Ryo Yonamine🇯🇵

   We present a new measurement of the bottom quark mass in the $\overline{MS}$ scheme at the renormalization scale of the Higgs boson mass from measurements of Higgs boson decay rates at the LHC: $m_b(m_H)=2.60_{-0.31}^{+0.36}$ GeV. The measurement has a negligible theory uncertainty and excellent prospects to improve at the HL-LHC and a future Higgs factory. Confronting this result, and $m_b(m_b)$ from low-energy measurements and $m_b(m_Z)$ from $Z-$pole data, with the prediction of the scale evolution of the renormalization group equations, we find strong evidence for the "running" of the bottom quark mass.

   hep-phhep-exPRL(2022)·26 citations
2. 02*

   First global QCD analysis of the TMD ${\mathbf{g}}_{1\mathbf{T}}$ from semi-inclusive DIS data

   Shohini Bhattacharya🇺🇸 · Zhong-Bo Kang🇺🇸 · Andreas Metz🇺🇸 · Gregory Penn🇺🇸 · Daniel Pitonyak🇺🇸

   The worm-gear transverse momentum dependent (TMD) function $g_{1T}$ is one of the eight leading-twist TMDs and has the probabilistic interpretation of finding a longitudinally polarized quark inside a transversely polarized hadron. In this work, we present the first simultaneous extraction of $g_{1T}$ from all the available experimental measurements. The study involves the analysis of COMPASS, HERMES, and Jefferson Lab data on semi-inclusive deep-inelastic scattering using Monte Carlo techniques. We also compare $g_{1T}$ obtained from this experimental data with different theoretical approaches, such as the large-$N_c$ approximation, the Wandzura-Wilczek-type approximation, and lattice QCD.

   hep-phhep-exhep-latPRD(2022)·34 citations
3. 03*

   Kinematic distributions of the ${\eta }_c$ leptoproduction in association with light hadrons

   Hong-Fei Zhang🇨🇳 · Xue-Mei Mo🇨🇳

   The ${\eta }_c$ meson leptoproduction is calculated within the nonrelativistic QCD framework for the first time. It is found that the colour-singlet channel, although suppressed by a factor of ${\alpha }_s$ relative to the colour-octet ones, provides the most important contribution for almost all the experimental conditions, which disagrees with some of the expectations before computation. We present the differential cross sections with respect to $p_t^2$, $p_t^{\star 2}$, $Q^2$, $W$, and $z$, for both HERA and EIC experimental conditions as a reference for future studies. The scale dependence and long-distance-matrix-element dependence are also investigated in this paper.

   hep-phJHEP(2021)·1 citation
4. 04*

   Purely Radiative Higgs Mass in Scale invariant models

   Amine Ahriche (Sharjah U., ICTP Trieste & ENS-Kouba Algiers)🇮🇹

   In this work, we investigate the possibility of having scale invariant (SI) standard model (SM) extensions, where the light CP-even scalar matches the SM-like Higgs instead of being a light dilaton. After deriving the required conditions for this scenario, we show that the radiative corrections that give rise to the Higgs mass can trigger the scalar mixing to the experimentally allowed values. In addition, we discuss the constraints on the parameters space that makes the CP-even scalars properties in a good agreement with all the recent ATLAS and CMS measurements. We illustrate this scenario by considering the SI-scotogenic model as an example, while imposing all the theoretical and experimental constraints. We show that the model is viable and leads to possible modifications of the di-Higgs signatures at current/future with respect to the SM.

   hep-phNPB(2022)·7 citations
5. 05*

   Consistent explanation for the cosmic-ray positron excess in $p$-wave Breit-Wigner enhanced dark matter annihilation

   Yu-Chen Ding🇨🇳 · Yu-Lin Ku🇨🇳 · Chun-Cheng Wei🇨🇳 · Yu-Feng Zhou🇨🇳

   Dark matter (DM) annihilation in the galactic halo can be enhanced relative to that in the early Universe due to the Breit-Wigner enhancement, if the DM particles annihilate through a narrow resonance. Although the $s$-wave Breit-Wigner enhancement can provide a consistent explanation for both the observed cosmic-ray (CR) positron excess and the DM thermal relic density, it is severely constrained by the observations of gamma rays from dwarf spheroidal satellite galaxies (dSphs) and the cosmic microwave background (CMB), which have relatively lower allowed DM annihilation cross section and typical DM velocities than that in the galactic halo. Furthermore, in the $s$-wave Breit-Wigner enhancement, the case where the resonance mass is below a threshold (twice the DM mass) is ruled out due to the monotonically increasing annihilation cross section with decreasing DM velocity. In this work, we consider Breit-Wigner enhanced $p$-wave DM annihilation. We explore the parameter regions which can simultaneously account for the CR positron excess and DM thermal relic density without violating the constraints from dSphs gamma rays and CMB. We show that the velocity-dependent cross section in this scenario can peak around the typical DM velocity in the galactic halo for the resonance mass both above and below the threshold. Moreover, the highly suppressed annihilation cross section at extremely low DM velocity can evade the constraints from dSphs gamma rays and CMB easily, which results in larger allowed parameter regions than that in the $s$-wave case.

   hep-phEPJC(2022)·6 citations
6. 06*

   Axial inverse magnetic catalysis

   Yuanyuan Wang🇨🇳 · Shinya Matsuzaki🇨🇳

   We find that the inverse magnetic catalysis for $U(1)$ axial symmetry (AIMC: axial inverse magnetic catalysis) can emerge around the chiral crossover regime in the thermomagnetic QCD with 2 + 1 flavors at physical point. This phenomenon can be correlated with the IMC for the chiral $SU(2{)}_L\times SU(2{)}_R$ symmetry (CIMC: chiral IMC). We explicitly observe the AIMC based on a Nambu-Jona-Lasinio model with 2 + 1 quark flavors, where introduced anomalous magnetic moments of the quarks play the essential role to drive both the CIMC and AIMC. Our finding is shortly testable on lattices. Possible phenomenological and cosmological implications are also briefly addressed.

   hep-phhep-latnucl-thPRD(2022)·6 citations
7. 07*

   Probing The Neutrino Sector via A Statistical Approach

   Yu-Cheng Qiu🇨🇳 · Hui-Yu Zhu🇨🇳

   We apply the idea of landscape (motivated by string theory) to study the statistical nature of parameters/couplings in the standard model of strong and electroweak interactions. Following the success of this approach on the fermion masses, we discuss the divergent behavior of the probability distributions of other physical parameters/couplings to obtain some insights on the quantities that cannot be measured by current experiments but can be relevant in cosmology, in particular those in the neutrino sector. From a relatively strongly mixed PMNS matrix, we argue that the probability distribution of heavy neutrino mass $P(M)$ does not diverge at $M=0$. This analysis favors the degenerate heavy neutrino scenarios.

   hep-phhep-thInt.J.Mod.Phys.A(2022)·1 citation
8. 08*

   CP violation in top quark decay via heavy Majorana neutrinos at the LHC

   Peng-Cheng Lu🇨🇳 · Zong-Guo Si🇨🇳 · Zhe Wang🇨🇳 · Xing-Hua Yang🇨🇳

   The tiny neutrino masses can be explained naturally by extending the standard model with right-handed Majorana neutrinos in low-scale seesaw mechanism, and the CP violation effect induced by Majorana phase is interesting and worth studying at colliders. In this paper, we investigate the prospects for measuring CP violation in top quark pair production and rare decay via Majorana neutrinos at the LHC. The CP asymmetry stems from the significant interference of contributions from two different Majorana neutrinos and can be appreciable when the two neutrino masses are nearly-degenerate. It is found that in the Majorana neutrino mass range of 10 GeV < mn < 80 GeV, the CP asymmetry is independent of the Majorana neutrino mass at the LHC. Any possible new observation of CP violation will be the clear evidence of new physics beyond the standard model.

   hep-phPRD(2021)·4 citations
9. 09*

   Muon $g-2$, $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ anomalies, and leptophilic dark matter in $U(1{)}_{\mu -\tau }$ gauge symmetry

   P. Ko🇰🇷 · Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷

   We propose a new class of $U(1{)}_{\mu -\tau }$ gauged model that can explain recent flavor anomalies such as muon $g-2$, $b\to s{\mu }^{+}{\mu }^{-}$, as well as include a scalar dark matter candidate while satisfying all the phenomenological constraints. For this purpose, we add new vectorlike quarks and leptons as well as two inert singlet scalars, one leptophilic and the other leptophobic. In our model $b\to s{\mu }^{+}{\mu }^{-}$ anomalies can be explained by loop induced interactions among the SM and exotic quarks and $Z^{\prime }$ gauge boson. In our numerical analysis, we show allowed region of our model to be narrow, and it would be tested soon, for example by searching for 4 muons and dimuon + missing transverse momentum from $pp\to {\mu }^{+}{\mu }^{-}{Z}^{\prime }$ and $pp\to {\nu }_{\mu ,\tau }{\bar{\nu }}_{\mu ,\tau }{Z}^{\prime }$ followed by $Z^{\prime }\to {\mu }^{+}{\mu }^{-},{\nu }_{\mu ,\tau }{\bar{\nu }}_{\mu ,\tau }$ at the LHC.

   hep-phhep-exJHEP(2022)·21 citations
10. 10*

    Four-loop scattering amplitudes journey into the forest

    Selomit Ramírez-Uribe · Roger J. Hernández-Pinto · Andrés E. Rentería-Olivo · Germán Rodrigo · German F. R. Sborlini · William J. Torres Bobadilla · Luiz Vale Silva

    We present an overview of the analysis of the multiloop topologies that appear for the first time at four loops and the assembly of them in a general expression, the N${}^4$MLT universal topology. Based on the fact that the Loop-Tree Duality enables to open any scattering amplitude in terms of convolutions of known subtopologies, we go through the dual representation of the universal N${}^4$MLT topology and the manifestly causal representation. Additionally, we expose the application of a quantum algorithm as an alternative methodology to identify the causal singular configurations of multiloop Feynman diagrams.

    hep-phquant-phPoS(2022)·3 citations
11. 11*

    Massive Two-Loop Heavy Particle Diagrams

    B. Assi🇩🇪 · B. A. Kniehl🇩🇪 · A. I. Onishchenko🇷🇺

    We determine the master integrals for vertex and propagator diagrams that appear in effective field theories containing heavy fields. The integrals involve at least one heavy line, and the standard lines include an arbitrary mass scale. The evaluation is done analytically with modern techniques. We employ the methods of differential equations and dimensional recurrence relations to evaluate said integrals up to two-loop order.

    hep-phPRD(2022)·1 citation
12. 12*

    A Theory of Dark Pions

    Hsin-Chia Cheng🇺🇸 · Lingfeng Li🇺🇸 · Ennio Salvioni🇨🇭

    We present a complete model of a dark QCD sector with light dark pions, broadly motivated by hidden naturalness arguments. The dark quarks couple to the Standard Model via irrelevant $Z$- and Higgs-portal operators, which encode the low-energy effects of TeV-scale fermions interacting through Yukawa couplings with the Higgs field. The dark pions, depending on their $CP$ properties, behave as either composite axion-like particles (ALPs) mixing with the $Z$ or scalars mixing with the Higgs. The dark pion lifetimes fall naturally in the most interesting region for present and proposed searches for long-lived particles, at the LHC and beyond. This is demonstrated by studying in detail three benchmark scenarios for the symmetries and structure of the theory. Within a coherent framework, we analyze and compare the GeV-scale signatures of flavor-changing meson decays to dark pions, the weak-scale decays of $Z$ and Higgs bosons to hidden hadrons, and the TeV-scale signals of the ultraviolet theory. New constraints are derived from $B$ decays at CMS and from $Z$-initiated dark showers at LHCb, focusing on the displaced dimuon signature. We also emphasize the strong potential sensitivity of ATLAS and CMS to dark shower signals with large multiplicities and long lifetimes of the dark pions. As a key part of our phenomenological study, we perform a new data-driven calculation of the decays of a light ALP to exclusive hadronic Standard Model final states. The results are provided in a general form, applicable to any model with arbitrary flavor-diagonal couplings of the ALP to fermions.

    hep-phhep-exJHEP(2022)·68 citations
13. 13*

    Flavor probes of axion-like particles

    Martin Bauer🇬🇧 · Matthias Neubert🇩🇪 · Sophie Renner🇮🇹 · Marvin Schnubel🇩🇪 · Andrea Thamm🇦🇺

    Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model (SM). We investigate the phenomenology of an ALP with flavor-changing couplings, and present a comprehensive analysis of quark and lepton flavor-changing observables within a general ALP effective field theory. Observables studied include rare meson decays, flavor oscillations of neutral mesons, rare lepton decays, and dipole moments. We derive bounds on the general ALP couplings as a function of its mass, consistently taking into account the ALP lifetime and branching ratios. We further calculate quark flavor-changing effects that are unavoidably induced by running and matching between the new physics scale and the scale of the measurements. This allows us to derive bounds on benchmark ALP models in which only a single (flavorless or flavor-universal) ALP coupling to SM particles is present at the new physics scale, and in this context we highlight the complementarity and competitiveness of flavor bounds with constraints derived from collider, beam dump and astrophysical measurements. We find that searches for ALPs produced in meson decays provide some of the strongest constraints in the MeV-GeV mass range, even for the most flavorless of ALP models. Likewise, we discuss the interplay of flavor-conserving and flavor-violating couplings of the ALP to leptons, finding that constraints from lepton flavor-violating observables generally depend strongly on both. Additionally, we analyze whether an ALP can provide an explanation for various experimental anomalies including those observed in rare B-meson decays, measurements at the ATOMKI and KTeV experiments, and in the anomalous magnetic moments of the muon and the electron.

    hep-phJHEP(2022)·299 citations
14. 14*

    Lattice simulations of Abelian gauge fields coupled to axions during Inflation

    Angelo Caravano🇩🇪 · Eiichiro Komatsu🇩🇪 · Kaloian D. Lozanov🇺🇸 · Jochen Weller🇩🇪

    We use a lattice simulation to study a model of axion inflation where the inflaton is coupled to a U(1) gauge field through Chern-Simons interaction. These kinds of models have already been studied with a lattice simulation in the context of reheating. In this work, we focus on the deep inflationary phase and discuss the new aspects that need to be considered in order to simulate gauge fields in this regime. Our main result is reproducing with precision the growth of the gauge field on the lattice induced by the rolling of the axion on its potential, thus recovering the results of linear perturbation theory for this model. In order to do so, we study in detail how the spatial discretization, through the choice of the spatial derivatives on the lattice, influences the dynamics of the gauge field. We find that the evolution of the gauge field is highly sensitive to the choice of the spatial discretization scheme. Nevertheless, we are able to identify a discretization scheme for which the growth of the gauge field on the lattice reproduces the one of continuous space with good precision.

    ↳ astro-ph.COgr-qchep-phPRD(2022)·47 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.