Mon·Aug 22, 2022Monday·August 22, 2022

1. 01*

   Laser-assisted electron-nucleon scattering

   I. Dahiri · M. Baouahi · M. Ouali · B. Manaut · E. Hrour · M. El Idrissi · S. Taj

   In both absence and presence of a circularly polarized monochromatic electromagnetic pulse, we have analyzed the electron-nucleon scattering process, where the nucleon is assumed to be spinless with a spherical shape. We have provided the theoretical calculation of the differential cross section (DCS) by using the Dirac-Volkov formalism. This research paper aims to provide two comparisons: We first compare the DCS in the absence of the laser field with its corresponding laser-assisted DCS. A second comparison is made between the electron-proton and electron-neutron scattering processes to study the effect of the laser on both processes. The results obtained about the effect of the laser field on the DCS and the electric form factor have been discussed for both scattering processes. We have found that the DCS is reduced when the laser field is applied for both processes. In addition, the form factor is also decreased by raising the incident electron energy in electron-proton scattering, but it increases in electron-neutron scattering. Moreover, the form factors for both scattering situations are unchanged by raising the laser field strength up to $10^{8}V/cm$.

   hep-phInt.J.Mod.Phys.B(2024)·1 citation
2. 02*

   Research on the electromagnetic and weak dipole moments of the tau-lepton at the Bestest Little Higgs Model

   E. Cruz-Albaro🇲🇽 · A. Gutiérrez-Rodríguez🇲🇽 · J. I. Aranda🇲🇽 · F. Ramírez-Zavaleta🇲🇽

   In this paper, using the Bestest Little Higgs Model (BLHM) we calculate at the one-loop level the contributions to the Anomalous Magnetic Dipole Moment (AMDM) and Anomalous Weak Magnetic Dipole Moment (AWMDM) of the tau-lepton. The implications from this model are study, emphasizing the contributions of the new physics induced by the new scalar and vector bosons of the BLHM: $S_i=H_0,A_0,{\varphi }^0,{\eta }^0,\sigma ,H^{\pm },{\varphi }^{\pm },{\eta }^{\pm }$, and $V_i=Z^{\prime },W^{\prime }$, because these quantify the new physics. With these new contributions we estimated bounds on both the real and imaginary parts of the AMDM and AWMDM of the tau-lepton. Our study complements other one-loop level research performed on models beyond the Standard Model.

   hep-phEPJC(2022)·9 citations
3. 03*

   Doubly-polarized $WZ$ hadronic production at NLO QCD+EW: Calculation method and further results

   Duc Ninh Le🇻🇳 · Julien Baglio🇨🇭 · Thi Nhung Dao🇻🇳

   The doubly-polarized production of $W^{\pm }Z$ pairs at the Large Hadron Collider (LHC) is presented at next-to-leading order (NLO) accuracy both for the electroweak (EW) and QCD corrections, including a detailed description of the calculational method using the double-pole approximation. Numerical results at the 13 TeV LHC are presented in particular for the $W^{-}Z$ case in the $e^{-}{\bar{\nu }}_e{\mu }^{+}{\mu }^{-}$ channel using ATLAS fiducial cuts and for polarized distributions defined in the $WZ$ center-of-mass system. The NLO EW corrections relative to the NLO QCD predictions are found to be smaller than $5\%$ in most kinematic distributions, but can reach the level of $10\%$ in some distributions such as lepton transverse momentum distributions or rapidity separation between the electron and the $Z$ boson. EW corrections are not uniform for different polarizations. A comparison between the new ATLAS measurement of polarization fractions to our theoretical prediction is presented.

   hep-phEPJC(2022)·36 citations
4. 04*

   Four-loop QCD cusp anomalous dimension at small angle

   Andrey G. Grozin🇷🇺 · Roman N. Lee🇷🇺 · Andrey F. Pikelner🇷🇺

   We calculate the small angle expansion of the four-loop QCD cusp anomalous dimension. As a byproduct of our calculation, we also obtain the four-loop anomalous dimension of the heavy-quark field in HQET. The validity of the calculational setup is cross-checked by the independent calculation of the four-loop QCD beta-function from heavy-quark-gluon vertex renormalization in HQET. We check the obtained results for the cusp anomalous dimension and heavy-quark field anomalous dimension against available analytical and numerical results. Finally, we find that the maximal transcendentality contribution to the QCD Bremsstrahlung function coincides, up to a factor 3/2, with the Bremsstrahlung function in N = 4 supersymmetric Yang-Mills theory, at least, through 4 loops.

   hep-phhep-thJHEP(2022)·8 citations
5. 05*

   Quartic Gauge-Higgs couplings: Constraints and Future Directions

   Anisha🇬🇧 · Oliver Atkinson🇬🇧 · Akanksha Bhardwaj🇬🇧 · Christoph Englert🇬🇧 · Panagiotis Stylianou🇬🇧

   Constraints on quartic interactions of the Higgs boson with gauge bosons have been obtained by the experimental LHC collaborations focussing on the so-called $\kappa$ framework of flat rescalings of SM-like interactions in weak boson fusion (WBF) Higgs pair production. While such approaches are admissible to obtain a qualitative picture of consistency with the SM when the statistical yield is low, once more statistics become available a more theoretically consistent framework of limit setting is desirable. Reviewing the constraints provided at the Large Hadron Collider, we first show that these limits are robust when considered in a leading order context. Turning to radiative corrections, we demonstrate the limitations of this approach in the SM, and by adopting Higgs effective field theory techniques, we clarify the sensitivity from single Higgs measurements to rescalings of quartic Higgs-gauge couplings. We then discuss avenues for sensitivity improvements of WBF analyses employing Graph Neural Networks to combat the large contributing backgrounds.

   hep-phhep-exJHEP(2022)·21 citations
6. 06*

   Bounds on boosted dark matter from direct detection: The role of energy-dependent cross sections

   Debjyoti Bardhan🇮🇱 · Supritha Bhowmick🇮🇳 · Diptimoy Ghosh🇮🇳 · Atanu Guha🇰🇷 · Divya Sachdeva🇫🇷

   The recoil threshold of Direct Detection experiments limits the mass range of Dark Matter (DM) particles that can be detected, with most DD experiments being blind to sub-MeV DM particles. However, these light DM particles can be boosted to very high energies via collisions with energetic Cosmic Ray electrons. This allows Dark Matter particles to induce detectable recoil in the target of Direct Detection experiments. We derive constraints on scattering cross section of DM and electron, using XENONnT and Super-Kamiokande data. Vector and scalar mediators are considered, in the heavy and light regimes. We discuss the importance of including energy dependent cross sections (due to specific Lorentz structure of the vertex) in our analysis, and show that the bounds can be significantly different than the results obtained assuming constant energy-independent cross-section, often assumed in the literature for simplicity. Our bounds are also compared with other astrophysical and cosmological constraints.

   hep-phhep-exPRD(2023)·45 citations
7. 07*

   Probing feebly interacting dark matter with monojet searches

   Jérôme Claude🇨🇦 · Maíra Dutra🇨🇦 · Stephen Godfrey🇨🇦

   Dark matter may consist of feebly interacting massive particles (FIMPs) that never thermalized with the cosmic plasma. Their relic density is achieved via freeze-in for a wide range of masses, significantly expanding the model space that can be tested compared to other production mechanisms. However, testing the tiny couplings required by freeze-in is challenging. We show that FIMPs can be probed by LHC searches for new physics in mono-jet events with large missing energy. We study a $Z^{\prime }$ portal model in which gluon annihilation produces FIMPs in the early universe and today at colliders. Monojet searches by LHC Run 3 might discover new physics accounted for by FIMPs with mass in the MeV-TeV range.

   hep-phPRD(2023)·13 citations
8. 08*

   NLO Electroweak Corrections to Multi-Boson Processes at a Muon Collider

   Pia Bredt🇩🇪 · Wolfgang Kilian🇩🇪 · Jürgen Reuter🇩🇪 · Pascal Stienemeier🇩🇪

   We present results on NLO electroweak (EW) corrections to multiple massive boson production processes at a future muon collider. Inclusive cross sections with $\mathcal{O}(\alpha )$ corrections for processes for up to four bosons in the final state as well as differential distributions for $HZ$ production are computed for $\sqrt{s}=3$, $10$ and $14$ TeV by using FKS subtraction in the NLO EW automated Monte-Carlo framework WHIZARD+RECOLA. Large logarithmic effects due to collinear ISR and EW virtual correction factors as well as the impacts of an energy cut on hard photons are discussed with an emphasis on the properties of Higgsstrahlung. The potential of a proposed muon collider for studying physics of the EW sector is underlined by the EW corrections significantly affecting observables for processes at high energies and boson multiplicities.

   hep-phJHEP(2022)·41 citations
9. 09*

   Generating and evaluating 1PI Feynman diagrams for an MSR field theory

   Rajiv G. Pereira🇮🇳

   We discuss certain computational methods and analytical techniques that can be used to automatize the various steps involved in the renormalization group analysis of an MSR field theory. The methods rely mainly on the well known packages FeynArts and SecDec. The former is used with minor modifications for generating the Feynman diagrams and obtaining the corresponding expressions, and the latter for dimensional regularization and epsilon expansion of the Feynman integrals. We first discuss how suitable classes and generic model files required by FeynArts are created, present the minor modifications made in the internal file Analytic.m, and then show how the diagrams and the expressions are generated. We then discuss the procedure followed in further simplifying the integrals obtained from the Feynman diagrams to render them in the form of standard scalar Feynman integrals so that the package SecDec can be used to dimensional regularize and epsilon expand them. We discuss these methods as it is applied to a particular theory, namely, the NSAPS three-vector model. However, they can be easily generalized to be applied to other similar MSR field theories.

   ↳ cond-mat.stat-mechhep-ph0 citations
10. 10*

    Search for the Chiral Effect using isobar collisions and BES-II data from STAR

    Yu Hu (for the STAR Collaborations)🇨🇳

    In these proceedings we discuss the recent precision measurements of charge separation difference between Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV by STAR collaboration. The measurements indicate that the magnitude of the difference in the charge separation attributable to the magnetic fields between the two systems is smaller than previously expected. We also present charge separation measurements on the Chiral Magnetic Effect search from the RHIC BES-II experiment using the Event Plane Detectors (EPD) from Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=$ 27 GeV.

    ↳ nucl-exhep-exhep-phnucl-thActa Phys.Polon.Supp.(2023)·4 citations
11. 11*

    Early quark deconfinement in compact star astrophysics and heavy-ion collisions

    Oleksii Ivanytskyi🇵🇱 · David Blaschke🇵🇱 · Tobias Fischer🇵🇱 · Andreas Bauswein🇩🇪

    Based on a recently developed relativistic density functional approach to color-superconducting quark matter and a novel quark-hadron transition construction which phenomenologically accounts for the effects of inhomogeneous pasta phases and quark-hadron continuity, we construct a class of hybrid equations of state applicable at the regimes typical for compact star astrophysics and heavy ion collisions. We outline that early quark deconfinement is a notable consequence of strong diquark pairing providing a good agreement with the observational data and driving the trajectories of the matter evolution during the supernovae explosions toward the regimes typical for the compact star mergers and heavy-ion collisions.

    ↳ nucl-thastro-ph.SRhep-phActa Phys.Polon.Supp.(2023)·4 citations
12. 12*

    The $\theta$-angle and axion physics of two-color QCD at fixed baryon charge. Part I

    Jahmall Bersini🇭🇷 · Alessandra D'Alise🇮🇹 · Francesco Sannino🇮🇹 · Matías Torres🇮🇹

    We analyze the impact of the $\theta$-angle and axion dynamics for two-color (in fact any $Sp(2N)$) QCD at nonzero baryon charge and as a function of the number of matter fields on the vacuum properties, the pattern of chiral symmetry breaking as well as the spectrum of the theory. We show that the vacuum acquires a rich structure when the underlying $CP$ violating topological operator is added to the theory. We discover novel phases and analyse the order of their transitions characterizing the dynamics of the odd and even number of flavours. We further determine the critical chemical potential as function of the $\theta$ angle separating the normal from the superfluid phase of the theory. Our results will guide numerical simulations and novel tests of the model's dynamics. The results are also expected to better inform phenomenological applications of the model ranging from composite Higgs physics to strongly interacting massive dark matter models featuring number changing interactions. In the companion work \cite{PartII} we repurpose and upgrade the approach to determine the impact of the $\theta$-angle and axion physics on non-perturbative near conformal dynamics related to the fixed baryon charge sector.

    ↳ hep-thhep-lathep-phJHEP(2022)·6 citations
13. 13*

    Charging the conformal window at nonzero $\theta$ angle

    Jahmall Bersini🇭🇷 · Alessandra D'Alise🇮🇹 · Francesco Sannino🇮🇹 · Matías Torres🇮🇹

    We determine the impact of the $\theta$-angle and axion physics on the near conformal dynamics of the large-charge baryon sector of $SU(2)$ gauge theories with $N_f$ fermions in the fundamental representation. We employ an effective approach featuring Goldstone and dilaton degrees of freedom augmented by the topological terms in the theory. We investigate how different dilaton potentials, including the ones for which a systematic counting scheme can be established, affect the results. Via state-operator correspondence we compute the corrections to the would-be conformal dimensions of the lowest large-charge operators as a function of the $\theta$ term and dilaton potential.

    ↳ hep-thhep-lathep-phPRD(2023)·9 citations
14. 14*

    Gauged Quintessence

    Kunio Kaneta🇯🇵 · Hye-Sung Lee🇰🇷 · Jiheon Lee🇰🇷 · Jaeok Yi🇰🇷

    Despite its dominance in the present universe's energy budget, dark energy is the least understood component in the universe. Although there is a popular model for the dynamical dark energy, the quintessence scalar, the investigation is limited because of its highly elusive character. We present a model where the quintessence is gauged by an Abelian gauge symmetry. The quintessence is promoted to be a complex scalar whose real part is the dark energy field while the imaginary part is the longitudinal component of a new gauge boson. It brings interesting characters to dark energy physics. We study the general features of the model, including how the quintessence behavior is affected and how the solicited dark energy properties constrain its gauge interaction. We also note that while the uncoupled quintessence models are suffered greatly from the Hubble tension, it can be alleviated if the quintessence is under the gauge symmetry.

    ↳ astro-ph.COhep-phJCAP(2023)·15 citations
15. 15*

    Dense Nuclear Matter with Baryon Overlap

    Jesper Leong (1) · Theo F. Motta ((1) and (2)) · Anthony W. Thomas (1) · P. A. M. Guichon (3) ((1) CSSM and ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, University of Adelaide, (2) Institut für Theoretische Physik, Justus-Liebig-Universität Giessen, (3) Irfu, CEA, Université Paris-Saclay)

    The possibility of new short-distance physics applicable inside the cores of NS is incorporated into the equation of state generated by the quark-meson coupling model. The contribution of this new physics to the energy density is taken to be proportional to the amount of overlap between the quark cores of the baryons involved. With no change to the properties of symmetric nuclear matter at saturation density, including an incompressibility compatible with data on giant monopole resonances, one can sustain neutron stars with a maximum mass $M_{max}>2.1$ M${}_{\odot }$, even when hyperons are included.

    ↳ nucl-thastro-ph.SRhep-ph2 citations
16. 16*

    Computation of masses of quarkonium bound states using heavy quark potentials from lattice QCD

    Michael Eichberg🇩🇪 · Marc Wagner🇩🇪

    We compute masses of bottomonium and charmonium bound states using a Schrödinger equation with a heavy quark-antiquark potential including $1/m$ and $1/m^2$ corrections previously derived in potential Non-Relativistic QCD and computed with lattice QCD. This is a preparatory step for a future project, where we plan to take into account similar corrections to study quarkonium resonances and tetraquarks above the lowest meson-meson thresholds.

    ↳ hep-lathep-phPoS(2023)·1 citation
17. 17*

    The inheritance of energy conditions: Revisiting no-go theorems in string compactifications

    Heliudson Bernardo🇨🇦 · Suddhasattwa Brahma🇬🇧 · Mir Mehedi Faruk🇨🇦

    One of the fundamental challenges in string theory is to derive realistic four-dimensional cosmological backgrounds from it despite strict consistency conditions that constrain its possible low-energy backgrounds. In this work, we focus on energy conditions as covariant and background-independent consistency requirements in order to classify possible backgrounds coming from low-energy string theory in two steps. Firstly, we show how supergravity actions obey many relevant energy conditions under some reasonable assumptions. Remarkably, we find that the energy conditions are satisfied even in the presence of objects which individually violate them due to the tadpole cancellation condition. Thereafter, we list a set of conditions for a higher-dimensional energy condition to imply the corresponding lower-dimensional one, thereby categorizing the allowed low-energy solutions. As for any no-go theorem, our aim is to highlight the assumptions that must be circumvented for deriving four-dimensional spacetimes that necessarily violate these energy conditions, with emphasis on cosmological backgrounds.

    ↳ hep-thastro-ph.COgr-qchep-phSciPost Phys.(2023)·22 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.