HEP Phenomenology·hep-ph

Tue·Oct 25, 2022Tuesday·October 25, 2022

39 papers—29 primary·10 cross-listed·reconstructed*

01*
Global Fits of Dirac Dark Matter Effective Field Theories
Ankit Beniwal (On behalf of the GAMBIT Collaboration)🇬🇧
In this proceeding, we present results from a global fit of Dirac fermion dark matter (DM) effective field theory (EFT) based on arXiv:2106.02056 using the GAMBIT framework. Here we show results only for the dimension-6 operators that describe the interactions between a gauge-singlet Dirac fermion and Standard Model quarks. Our global fit combines the latest constraints from \textit{Planck}, direct and indirect DM detection, and the LHC. For DM mass below 100 GeV, it is impossible to simultaneously satisfy all constraints while maintaining the EFT validity at high energies. For higher masses, however, large regions of parameter space remain viable where the EFT is valid and saturates the observed DM abundance.
hep-phastro-ph.COSciPost Phys.Proc.(2023)·4 citations
02*
Accessing gluon polarization with high- $P_{T}$ hadrons in SIDIS
R. M. Whitehill🇺🇸 · Yiyu Zhou🇨🇳 · N. Sato🇺🇸 · W. Melnitchouk🇺🇸
A recent global QCD analysis of jet production and other polarized scattering data has found the presence of negative solutions for the gluon helicity distribution in the proton, $Δ g$ , along with the traditional $Δ g > 0$ solutions. We consider polarized semi-inclusive deep-inelastic scattering for hadrons produced with large transverse momentum as a means of constraining the dependence of $Δ g$ on the parton momentum fraction, $x$ . Focusing on the double longitudinal spin asymmetry, we identify the kinematics relevant for future experiments at Jefferson Lab and the Electron-Ion Collider which are particularly sensitive to the polarized gluon channel and could discriminate between the different $Δ g$ behaviors.
hep-phhep-exnucl-thPRD(2023)·11 citations
03*
Re-examining $N_{R}$ -EFT Upto Dimension Six
Manimala Mitra🇮🇳 · Sanjoy Mandal🇰🇷 · Rojalin Padhan🇮🇳 · Agnivo Sarkar🇮🇳 · Michael Spannowsky🇬🇧
The gauge singlet right-handed neutrinos (RHNs) are essential fields in several neutrino mass models that explain the observed eV scale neutrino mass. We assume RHN field to be present in the vicinity of the electroweak scale and all the other possible beyond the standard model (BSM) fields arise at high energy scale $\geq Λ$ . In this scenario, the BSM physics can be described using effective field theory (EFT) where the set of canonical degrees of freedoms consists of both RHN and SM fields. EFT of this kind is usually dubbed as $N_{R}$ -EFT. We systematically construct relevant operators that can arise at dimension five and six while respecting underlying symmetry. To quantify the phenomenological implication of these EFT operators we calculate different couplings that involve RHN fields. We discuss the constraints on these EFT operators coming from different energy and precision frontier experiments. For $pp$ , $e^{-} p$ and $e^{+} e^{-}$ colliders, we identify various channels which crucially depends on these operators. We analytically evaluate the decay widths of RHN considering all relevant operators and highlight the differences that arise because of the EFT framework. Based upon the signal cross-section we propose different multi-lepton channels to search for the RHN at 14 TeV LHC as well as \emph{future} particle colliders.
hep-phPRD(2022)·22 citations
04*
Five loop anomalous dimension of non-singlet quark currents in the RI' scheme
J.A. Gracey🇬🇧
We construct the five loop anomalous dimensions of the basic fields in Quantum Chromodynamics in a linear covariant gauge in the modified Regularization Invariant (RI') scheme. Using these core results we also compute the four loop Green's function where the quark mass operator and vector current are separately inserted in a quark 2-point function. These are necessary for measurements of the same quantities on the lattice. The Green's functions are provided in both the modified Minimal Subtraction (MSbar) and RI' schemes. All the results are available for a general Lie group.
hep-phhep-latEPJC(2023)·10 citations
05*
A phenomenological note on the missing $ρ_{2}$ meson
Shahriyar Jafarzade🇵🇱
The $ρ_{2}$ meson is the missing isovector member of the meson nonet with the quantum numbers $J^{P C} = 2^{--}$ . It belongs to the class of $ρ$ -mesons such as the vector meson $ρ (770)$ , the excited vector $ρ (1700)$ and the tensor $ρ_{3} (1690)$ . Yet, despite the rich experimental and theoretical studies for other $ρ$ -meson states, no resonance that could be assigned to the $ρ_{2}$ meson has been measured. In this note, we present the results for the mass and dominant decay channels of the $ρ_{2}$ meson within the extended Linear Sigma Model.
hep-phPoS(2022)·0 citations
06*
A symmetry preserving contact interaction treatment of the kaon
Zanbin Xing🇨🇳 · Lei Chang🇨🇳
A symmetry-preserving regularization procedure for dealing with the contact interaction model is proposed in this work. This regularization procedure follows a series of consistency conditions which are necessary to maintain gauge symmetry. Under this regularization, proofs for the preservation of the Ward-Takahashi identities are given and the loop integrals in the contact interaction model are systematically computed. As an application example, the kaon electromagnetic form factor and $K_{l 3}$ transition form factor are computed and self-consistent results are obtained. Since the proposed regularization properly handles the divergence, one is freed from the inconsistencies caused by the regularization and can concentrate more on the physical discussion.
hep-phPRD(2023)·22 citations
07*
Sommerfeld effect in freeze-in dark matter
Fucheng Zhong🇨🇳 · Xinyu Wang🇨🇳
If two annihilation products of dark matter (DM) particles are non-relativistic and coupled to a light force mediator, their plane wave functions are modified due to multiple exchanges of the force mediators. This gives rise to the Sommerfeld effect (SE). We consider the attractive and repulsive force SE on the relic density in different phases of freeze-in DM. We find that in the pure freeze-in region, the attractive/repulsive force SE slightly increases/decreases DM relic density by less than $20%$ for TeV-scale DM. In the reannihilation region, if the portal coupling $κ$ is sufficiently large (by comparing the portal reaction rate to the Hubble rate), DM density will reach its equilibrium, and subsequently freeze out. Compared to the case without the SE, the presence of the attractive SE leads to an enlarged cross-section. As a result, a higher equilibrium value of DM density is reached, and a lower relic density is obtained after the subsequent freeze-out. However, the repulsive SE has the opposite influence. In the dark sector (DS) freeze-out region, also known as the middle flat plateau or ``mesa'' in the phase diagram, the SE has a significant impact on DM relic abundance. In this region, the attractive SE suppresses DM relic density by simultaneously enlarging the cross-section of the portal and DS internal interaction. In contrast, the repulsive SE will have the opposite effect. Finally, in the usual freeze-out region, DM relic density is suppressed or enhanced by an enlarged or reduced cross-section of the portal, respectively, due to the presence of the attractive or repulsive SE. In summary, when considering the constraint of producing correct DM relic abundance, the inclusion of SE in the portal reaction or DS internal reaction will modify the model parameters, resulting in a band-like possible parameter space.
hep-ph1 citation
08*
Hunting for an EMC-like effect for antiquarks
Massimiliano Alvioli🇮🇹 · Mark Strikman🇺🇸
We argue that the Drell-Yan process in the $x_{A} \geq 0.15$ kinematics recently studied at FNAL by the E906/SeaQuest experiment may allow to observe an analogous of the EMC effect for antiquarks. The effects of Fermi motion and energy loss are considered. The preliminary E906/SeaQuest data are inconsistent with the growth of the $σ_{A} / A σ_{N}$ ratio expected in the Fermi motion scenario at $x_{A} \geq 0.25$ . The pattern of the $x_{A}$ dependence of the ratio seems also inconsistent with a scenario in which the dominant nuclear effect is a suppression of the cross section due to the energy loss experienced by a quark of the projectile proton involved in the Drell-Yan process. All together the data suggest the possibility of a modification of the antiquark parton distributions in nuclei, with a pattern similar to the one observed in the EMC effect. We argue that optimal kinematics to look for an antiquark EMC-like effect would be to measure the $σ_{A}^{D Y} / A σ_{N}^{D Y}$ ratios for $x_{A}$ = 0.2-0.4 and $x_{p}$ $\approx$ constant.
hep-phhep-exnucl-exnucl-thPLB(2023)·1 citation
09*
Weak Decays of Antitriplet Charmed Baryons from the Perspective of Flavor Symmetry
Huiling Zhong🇨🇳 · Fanrong Xu🇨🇳 · Qiaoyi Wen🇨🇳 · Yu Gu🇨🇳
In this work, we carry out a global fitting for the two-body weak decays of antitriplet charmed baryons in both SU(3) respected and broken scenarios incorporating all the available data up to date. In the SU(3) irreducible representation approach (IRA), more amplitudes for irreducible representation terms are taken into account and the ranges for their coefficients in each scenarios are predicted. By a comparison among various fitting schemes in this work, experimental data prefer the SU(3) symmetry breaking scenario. Observables of interest, branching fractions and decay asymmetries of all the Cabibbo-favored (CF), singly Cabibbo-suppresed (SCS) and doubly Cabibbo-suppressed (DCS) channels are calculated in the chosen fitting scheme. Most of our predictions are consistent well with experimental data. We further propose more ways to explore the SU(3) symmetry in charmed baryon decays. An improved measurement for $α (Λ_{c}^{+} \to p K_{S})$ is called for since predictions from both fittings, including the one in current work and earlier works, and the pole model calculation prefer an opposite sign from previous experimental value. Given branching fractions of most of the CF modes and part of the SCS modes being measured, predictions for the remaining channels, including the DCS modes as well as more decay asymmetries, are anticipated to be checked by the upcoming experiments in BESIII, Belle/Belle-II and LHCb.
hep-phJHEP(2023)·35 citations
10*
Search for Lepton Flavor Violating Decay at FASER
Takeshi Araki🇯🇵 · Kento Asai🇯🇵 · Hidetoshi Otono🇯🇵 · Takashi Shimomura🇯🇵 · Yosuke Takubo🇯🇵
FASER is one of the promising experiments which search for long-lived particles beyond the Standard Model. In this paper, we consider charged lepton flavor violation (CLFV) via a light and weakly interacting boson and discuss the detectability by FASER. We focus on four types of CLFV interactions, i.e., the scalar-, pseudoscalar-, vector-, and dipole-type interaction, and calculate the sensitivity of FASER to each CLFV interaction. We show that, with the setup of FASER2, a wide region of the parameter space can be explored. Particularly, it is found that FASER2 has a sensitivity to very small coupling regions in which the rare muon decays, such as $μ \to e γ$ , cannot place bounds, and that there is a possibility to detect CLFV decays of the new light bosons.
hep-phJHEP(2023)·12 citations
11*
Interpreting AFBb, ALR and MW
Francois Richard🇫🇷
After the long-standing mismatch between ALR and AFBb measurements for predicting the Higgs boson mass, the recent and very precise result on Mw confirms the existence of a crisis in the sector of electroweak measurements. In this note, it is shown that ALR and Mw can be simply reconciled by assuming a common value for the T parameter. Consequently, the AFBb deviation is amplified and reaches a 4 s.d. significance. Interpreting this as evidence for a non-universal behaviour of the b quark is proposed within an extra dimension model. Large deviations with respect to the SM are expected at future Z factories.
hep-phhep-ex0 citations
12*
Independence of current components, polarization vectors, and reference frames in the light-front quark model analysis of meson decay constants
Ahmad Jafar Arifi🇰🇷 · Ho-Meoyng Choi🇰🇷 · Chueng-Ryong Ji🇺🇸 · Yongseok Oh🇰🇷
The issue of resulting in the same physical observables with different current components, in particular from the minus current, has been challenging in the light-front quark model (LFQM) even for the computation of the two-point functions such as meson decay constants. At the level of one-body current matrix element computation, we show the uniqueness of pseudoscalar and vector meson decay constants using all available components including the minus component of the current in the LFQM consistent with the Bakamjian-Thomas construction. Regardless of the current components, the polarization vectors, and the reference frames, the meson decay constants are uniquely determined in the non-interacting constituent quark and antiquark basis while the interactions of the constituents are added to the meson mass operator in the LFQM.
hep-phnucl-thPRD(2023)·21 citations
13*
Further understanding the nature of $a_{0} (1710)$ in the $D_{s}^{+} \to π^{0} K^{+} K_{S}^{0}$ decay
Xin Zhu🇨🇳 · Hao-Nan Wang🇨🇳 · De-Min Li🇨🇳 · En Wang🇨🇳 · Li-Sheng Geng🇨🇳 · Ju-Jun Xie🇨🇳
Based on our previous work about the role of $a_{0} (1710)$ in the $D_{s}^{+} \to π^{+} K_{S}^{0} K_{S}^{0}$ decay [Phy. Rev. D 105, 116010 (2022)], we perform a further theoretical study of $a_{0} (1710)^{+}$ in the process $D_{s}^{+} \to π^{0} a_{0} (1710)^{+} \to π^{0} K^{+} K_{S}^{0}$ . In addition to $a_{0} (1710)$ , the contributions of $K^{*}$ and $a_{0} (980)$ are also taken into account. Firstly, we consider the contributions from the tree diagrams of $K^{*+} \to K^{+} π^{0}$ and $K ˉ^{* 0} \to π^{0} K ˉ^{0}$ . Secondly, we describe the final state interaction of $K K ˉ$ in the chiral unitary approach to study the contribution of $a_{0} (980)$ , while the $a_{0} (1710)$ state is dynamically generated from the $K^{*} K ˉ^{*}$ interaction, and then decays into $K^{+} K ˉ^{0}$ . Since the final $K^{+} K_{S}^{0}$ state is in pure isospin $I = 1$ , the $D_{s}^{+} \to π^{0} K^{+} K_{s}^{0}$ decay is an ideal process to study the $a_{0} (1710)^{+}$ and $a_{0} (980)^{+}$ resonances. Based on our theoretical calculations, it is found that the recent experimental measurements on the $K^{+} K_{S}^{0}$ , $π^{0} K^{+}$ , and $π^{0} K_{S}^{0}$ invariant mass distributions can be well reproduced, which supports the molecular $K^{*} K ˉ^{*}$ nature of the scalar $a_{0} (1710)$ resonance.
hep-phhep-exnucl-exnucl-thPRD(2023)·32 citations
14*
Stringent constraint on CPT violation with the synergy of T2K-II, NO $ν$ A extension, and JUNO
T. V. Ngoc🇻🇳 · S. Cao🇻🇳 · N. T. Hong Van🇻🇳 · P. T. Quyen🇻🇳
Neutrino oscillation experiments have measured precisely the mass-squared differences of three neutrino mass eigenstates, and three leptonic mixing angles by utilizing both neutrino and anti-neutrino oscillations. The possible CPT violation may manifest itself in the difference of neutrino and anti-neutrino oscillation parameters, making these experiments promising tools for testing CPT invariance. We investigate empirically the sensitivity of the CPT test via the difference in mass-squared splittings ( $Δ m_{31}^{2} - Δ m_{31}^{2}$ ) and in leptonic mixing angles ( $sin^{2} θ_{23} - sin^{2} θ_{23}$ ) with the synergy of T2K-II, NO $ν$ A extension, and JUNO experiments. If the CPT symmetry is found to be conserved, the joint analysis of the three experiments will be able to establish limits of $∣Δ m_{31}^{2} - Δ m_{31}^{2} ∣$ < $5.3 \times 1 0^{- 3} eV^{2}$ and $∣ sin^{2} θ_{23} - sin^{2} θ_{23} ∣$ < $0.10$ at 3 $σ$ C. L. on the possible CPT violation. We find that with ( $Δ m_{31}^{2} - Δ m_{31}^{2}$ ), the dependence of the statistical significance on the relevant parameters to exclude the CPT conservation is marginal, and that, if the difference in the best-fit values of $Δ m_{31}^{2}$ and $Δ m_{31}^{2}$ measured by MINOS(+) and NO $ν$ A persists as the true, the combined analysis will rule out the CPT conservation at 4 $σ$ C. L.. With the ( $sin^{2} θ_{23} - sin^{2} θ_{23}$ ), the statistical significance to exclude CPT invariance depends strongly on the true value of $θ_{23} (θ_{23})$ . In case of maximal mixing of $θ_{23}$ , the CPT conservation will be excluded at 3 $σ$ C. L. or more if the difference in the best-fit values of $θ_{23}$ and $θ_{23}$ remains as the true.
hep-phhep-exPRD(2023)·8 citations
15*
Radiative Symmetry breaking, Cosmic Strings and Observable Gravity Waves in $U (1)_{R}$ symmetric $S U (5) \times U (1)_{χ}$
Waqas Ahmed🇨🇳 · Umer Zubair🇺🇸
We implement shifted hybrid inflation in the framework of supersymmetric $S U (5) \times U (1)_{χ}$ GUT model which provides a natural solution to the monopole problem appearing in the spontaneous symmetry breaking of $S U (5)$ . The $U (1)_{χ}$ symmetry is radiatevely broken after the end of inflation at an intermediate scale, yielding topologically stable cosmic strings. The Planck's bound on the gravitational interaction strength of these strings, characterized by $G_{N} μ_{s}$ are easily satisfied with the $U (1)_{χ}$ symmetry breaking scale which depends on the initial boundary conditions at the GUT scale. The dimension-5 proton lifetime for the decay $p \to K^{+} ν ˉ$ , mediated by color-triplet Higgsinos is found to satisfy current Super-Kamiokande bounds for SUSY breaking scale $M_{SUSY} ≳ 12.5$ TeV. We show that with minimal Kähler potential, the soft supersymmetry breaking terms play a vital role in bringing the scalar spectral index $n_{s}$ within the Planck's latest bounds, although with small tensor modes $r ≲ 2.5 \times 1 0^{- 6}$ and $S U (5)$ gauge symmetry breaking scale in the range ( $2 \times 1 0^{15} ≲ M_{α} ≲ 2 \times 1 0^{16}$ ) GeV. By employing non-minimal terms in the Kähler potential, the tensor-to-scalar ratio approaches observable values ( $r ≲ 1 0^{- 3}$ ) with the $S U (5)$ symmetry breaking scale $M_{α} ≃ 2 \times 1 0^{16}$ GeV.
hep-phgr-qchep-thJCAP(2023)·9 citations
16*
Mass spectra of double-bottom baryons
Zhen-Yu Li🇨🇳 · Guo-Liang Yu🇨🇳 · Zhi-Gang Wang🇨🇳 · Jian-Zhong Gu🇨🇳 · Hong-Tao Shen🇨🇳
Based on the relativistic quark model and the infinitesimally shifted Gaussian basis function method, we investigate the mass spectra of double bottom baryons systematically. In the $ρ$ -mode which appears lower in energy than the other excited modes, we obtain the allowed quantum states and perform a systematic study of the mass spectra of the $Ξ_{bb}$ and $Ω_{bb}$ families. We analyze the root mean square radii and quark radial probability density distributions to deeply understand the structure of the heavy baryons. Meanwhile, the mass spectra allow us to successfully construct the Regge trajectories in the $(J, M^{2})$ plane. We also predict the masses of the ground states of double bottom baryons and discuss the differences between the structures of our spectra and those from other theoretical methods. At last, the shell structure of the double bottom baryon spectra is shown, from which one could get a bird's-eye view of the mass spectra.
hep-phMod.Phys.Lett.A(2023)·12 citations
17*
Twin stau as a self-interacting dark matter
Michał Łukawski🇵🇱
Supersymmetric Twin Higgs models allow for reducing the fine-tuning with respect to Minimal Supersymmetric Standard Model by protecting the mass of the Higgs boson by additional, accidental global symmetry. This class of models introduce numerous new states, some of which might be candidates for dark matter. Since those reside in twin sector, they are not charged under Standard Model gauge group. We proposed twin stau as a candidate for dark matter. Even though twin stau is charged under twin electromagnetism, since supersymmetric partners obtain large masses from supersymmetry breaking they can easily escape bounds for self-interacting dark matter. The mass of twin stau which reproduces correct relic abundance is usually between 300 and 500 GeV. This scenario can be probed by future direct detection experiments such as Lux-Zepelin.
hep-phFrascati Phys.Ser.(2022)·0 citations
18*
Axion-Photon Conversion of LHAASO Multi-TeV and PeV Photons
Guangshuai Zhang🇨🇳 · Bo-Qiang Ma🇨🇳
The Large High Altitude Air Shower Observatory (LHAASO) has reported the detection of a large number of multi-TeV-scale photon events including also several PeV-scale gamma-ray-photon events with energy as high as 1.4 PeV. The possibility that some of these events may have extragalactic origins is not yet excluded. Here we propose a mechanism for the traveling of very-high-energy (VHE) and ultra-high-energy (UHE) photons based upon the axion-photon conversion scenario, which allows extragalactic above-threshold photons to be detected by observers on the Earth. We show that the axion-photon conversation can serve as an alternative mechanism, besides the threshold anomaly due to Lorentz invariance violation, for the very-high-energy features of the newly observed gamma ray burst GRB 221009A.
hep-phastro-ph.HEgr-qcChin.Phys.Lett.(2023)·35 citations
19*
Dipole portal and neutrinophilic scalars at DUNE revisited: the importance of the high-energy neutrino tail
Maksym Ovchynnikov🇩🇪 · Thomas Schwetz🇩🇪 · Jing-Yu Zhu🇩🇪
We estimate the sensitivity of the DUNE experiment to new physics particles interacting with neutrinos, considering the dipole portal to heavy neutral leptons and a neutrinophilic scalar with lepton-number $2$ as examples. We demonstrate that neutrinos from the high-energy tail of the DUNE flux, with energies $E_{ν} ≳ 5 - 10 GeV$ , may significantly improve the sensitivity to these models, allowing to search for particles as heavy as $≃ 10 GeV$ . We also study the impact of the so-called tau-optimized neutrino beam configuration, which slightly improves sensitivity to the new physics models considered here. For both models, we consider new production channels (such as deep-inelastic scattering) and provide a detailed comparison of different signatures in the detector.
hep-phPRD(2023)·23 citations
20*
Axion-like Dark Matter from the Type-II Seesaw Mechanism
Wei Chao · Mingjie Jin · Hai-Jun Li · Ying-Quan Peng
Although axion-like particles (ALPs) are popular dark matter candidates, their mass generation mechanisms as well as cosmic thermal evolutions are still unclear. In this letter, we propose a new mass generation mechanism of ALP during the electroweak phase transition in the presence of the type-II seesaw mechanism. As ALP gets mass uniquely at the electroweak scale, there is a cutoff scale on the ALP oscillation temperature irrelevant to the specific mass of ALP, which is a distinctive feature of this scenario. The ALP couples to the active neutrinos, leaving the matter effect of neutrino oscillations in a dense ALP environment as a smoking gun. As a by-product, the recent $W$ -boson mass anomaly observed by the CDF collaboration is also quoted by the TeV-scale type-II seesaw. We explain three kinds of new physics phenomena are with one stroke.
hep-phPRD(2024)·22 citations
21*
Variational quantum eigensolver for causal loop Feynman diagrams and directed acyclic graphs
Giuseppe Clemente🇩🇪 · Arianna Crippa🇩🇪 · Karl Jansen🇩🇪 · Selomit Ramírez-Uribe🇪🇸 · Andrés E. Rentería-Olivo🇪🇸 · Germán Rodrigo🇪🇸 · German F. R. Sborlini🇪🇸 · Luiz Vale Silva🇪🇸
We present a variational quantum eigensolver (VQE) algorithm for the efficient bootstrapping of the causal representation of multiloop Feynman diagrams in the Loop-Tree Duality (LTD) or, equivalently, the selection of acyclic configurations in directed graphs. A loop Hamiltonian based on the adjacency matrix describing a multiloop topology, and whose different energy levels correspond to the number of cycles, is minimized by VQE to identify the causal or acyclic configurations. The algorithm has been adapted to select multiple degenerated minima and thus achieves higher detection rates. A performance comparison with a Grover's based algorithm is discussed in detail. The VQE approach requires, in general, fewer qubits and shorter circuits for its implementation, albeit with lesser success rates.
hep-phhep-thquant-phPRD(2023)·39 citations
22*
Perturbative Color Correlations in Double Parton Scattering
B.Blok🇮🇱 · J. Mehl🇮🇱
We study the contribution of color correlations to Double Parton Scattering (DPS). We show that there is a specific class of Feynman diagrams related to so called 1 \textrightarrow{} 2 processes when the contribution of these color correlations is not Sudakov suppressed with the transverse scales. The split scale increases with the transverse scale Q, with color correlations being up to 5-10 percent of singlet ones. The effective absence of Sudakov suppression gives hope that although they are small relative to color singlet correlations, they eventually can be observed.
hep-phhep-exhep-latnucl-thInt.J.Mod.Phys.A(2024)·5 citations
23*
Explaining the $R_{K^{(*)}}$ anomalies and the CDF $M_{W}$ in Flavorful Top Seesaw Models with Gauged $U (1)_{L (- R)}$
Yi Chung🇩🇪
A new heavy $Z^{'}$ vector boson provides a possible explanation for the neutral current B anomalies and points to the scale where we expect the solution to the hierarchy problem to appear. In this paper, we explore a modified Top Seesaw model based on the global symmetry breaking of $U (3)_{L}$ to $U (2)_{L}$ . The symmetry is partially gauged such that the breaking introduces not only a composite Higgs doublet but also a TeV-scale $Z^{'}$ boson. The $U (3)_{L} / U (2)_{L}$ Top Seesaw model predicts a light Higgs boson as well as a large top Yukawa coupling. Additional $U (1)^{'}$ symmetry is gauged such that a flavorful TeV-scale $Z^{'}$ boson is introduced to address the B anomalies. The existence of a heavy vector-like top quark and $Z - Z^{'}$ mixing breaks the custodial symmetry, which predicts a heavier $W$ mass as observed by the CDF collaboration. Two possible candidates for the $U (1)^{'}$ symmetry corresponding to the $Z^{'}$ boson, $U (1)_{L}$ and $U (1)_{L - R}$ , are discussed in detail. The parameter space for the models to address both anomalies is presented. The direct searches of the $Z^{'}$ boson from dilepton channels are also studied. Based on the assumptions, a TeV-scale $Z^{'}$ boson is still viable and can be probed in the near future.
hep-ph4 citations
24*
Universality of the muon component of extensive air showers
Lorenzo Cazon🇪🇸 · Rúben Conceição🇵🇹 · Felix Riehn🇵🇹
In extensive air shower experiments, the number of muons crossing a detector at a given position, as well as their arrival time, arrival direction, and energy, are determined by a more fundamental 3-dimensional distribution linked to the hadronic core of the shower. Muons are produced high up in the atmosphere after the decay of mesons in the hadronic cascade. The distributions of production depth, energy, and transverse momentum of muons are enough to fully predict the muon component of air showers in any particular observational condition. By using air-shower simulations with the state-of-the-art hadronic interaction models, the mentioned distributions at production are analyzed as a function of zenith angle, primary mass, and hadronic interaction model, and their level of universality is studied and assessed in an exhaustive manner for the first time.
hep-phastro-ph.HEJCAP(2023)·14 citations
25*
Chiral and trace anomalies in Deeply Virtual Compton Scattering
Shohini Bhattacharya🇺🇸 · Yoshitaka Hatta🇺🇸 · Werner Vogelsang🇩🇪
Inspired by recent work by Tarasov and Venugopalan, we calculate the one-loop quark box diagrams relevant to polarized and unpolarized Deep Inelastic Scattering (DIS) by introducing off-forward momentum $l^{μ}$ as an infrared regulator. In the polarized case, we rederive the pole $1/ l^{2}$ related to the axial (chiral) anomaly. In addition, we obtain the usual logarithmic term and the DIS coefficient function. We interpret the result in terms of the generalized parton distributions (GPDs) $H ~$ and $E ~$ and discuss the possible violation of QCD factorization for the Compton scattering amplitude. Remarkably, we also find poles in the unpolarized case which are remnants of the trace anomaly. We argue that these poles are cancelled by the would-be massless glueball poles in the GPDs $H$ and $E$ as well as in their moments, the nucleon gravitational form factors $A, B$ and $D$ . This mechanism sheds light on the connection between the gravitational form factors and the gluon condensate operator $F^{μν} F_{μν}$ .
hep-phhep-thnucl-thPRD(2023)·35 citations
26*
Confronting the vector leptoquark hypothesis with new low- and high-energy data
Jason Aebischer🇨🇭 · Gino Isidori🇨🇭 · Marko Pesut🇨🇭 · Ben A. Stefanek🇨🇭 · Felix Wilsch🇨🇭
In light of new data we present an updated phenomenological analysis of the simplified $U_{1}$ -leptoquark model addressing charged-current $B$ -meson anomalies. The analysis shows a good compatibility of low-energy data (dominated by the lepton flavor universality ratios $R_{D}$ and $R_{D^{*}}$ ) with the high-energy constraints posed by $pp \to τ τ ˉ$ Drell-Yan data. We also show that present data are well compatible with a framework where the leptoquark couples with similar strength to both left- and right-handed third-generation fermions, a scenario that is well-motivated from a model building perspective. We find that the high-energy implications of this setup will be probed at the 95% confidence level in the high-luminosity phase of the LHC.
hep-phhep-exEPJC(2023)·65 citations
27*
Attracting the Electroweak Scale to a Tachyonic Trap
Sokratis Trifinopoulos🇺🇸 · Miguel Vanvlasselaer🇧🇪
We propose a new mechanism to dynamically select the electroweak scale during inflation. An axion-like field $ϕ$ that couples quadratically to the Higgs with a large initial velocity towards a critical point $ϕ_{c}$ where the Higgs becomes massless. When $ϕ$ crosses this point, it enters a region where the Higgs mass is tachyonic and this results into an explosive production of Higgs particles. Consequently, a back-reaction potential is generated and the field $ϕ$ is attracted back to $ϕ_{c}$ . After a series of oscillations around this point it is eventually trapped in its vicinity due to the periodic term of the potential. The model avoids transplanckian field excursions, requires very few e-folds of inflation and it is compatible with inflation scales up to $1 0^{5} GeV$ . The mass of $ϕ$ lies in the range of hundreds of GeV to a few TeV and it can be potentially probed in future colliders.
hep-phPRD(2023)·13 citations
28*
Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC
Jon Butterworth🇬🇧 · Julian Heeck🇺🇸 · Si Hyun Jeon🇰🇷 · Olivier Mattelaer🇧🇪 · Richard Ruiz🇵🇱
The Type II Seesaw model remains a popular and viable explanation of neutrino masses and mixing angles. By hypothesizing the existence of a scalar that is a triplet under the weak gauge interaction, the model predicts strong correlations among neutrino oscillation parameters, signals at lepton flavor experiments, and collider observables at high energies. We investigate reports that the Type II Seesaw can naturally accommodate recent measurements by the CDF collaboration, which finds the mass of the $W$ boson to be significantly larger than allowed by electroweak precision data, while simultaneously evading constraints from direct searches. Experimental scrutiny of this parameter space in the Type II Seesaw has long been evaded since it is not characterized by ``golden channels'' at colliders but instead by cascade decays, moderate mass splittings, and many soft final states. In this work, we test this parameter space against publicly released measurements made at the Large Hadron Collider. By employing a newly developed tool chain combining MadGraph5\_aMC@NLO and Contur, we find that most of the favored space for this discrepancy is already excluded by measurements of Standard Model final states. We give suggestions for further exploration at Run III of the LHC, which is now underway.
hep-phhep-exPRD(2023)·21 citations
29*
Study of Differential Scattering Cross-section using Yukawa term of medium-modified Cornell potential
Siddhartha Solanki🇮🇳 · Manohar Lal🇮🇳 · Vineet Kumar Agotiya🇮🇳
In the present work we have studied the Differential Scattering Cross-section for ground states of charmonium and bottomonium in the frame work of the medium modified form of quark-antiquark potential and Born-approximation using the non-relativistic quantum chromo-dynamics approach. To reach this end, quasi-particle (QP) Debye mass depending upon baryonic chemical potential ( $μ$ b) and temperature has been employed and hence the variation of Differential Scattering Cross-section with baryonic chemical potential and temperature at fixed value of the scattering angle ( $θ = 9 0^{\circ}$ ) has been studied. The variation of Differential Scattering Cross-section with scattering angle $θ$ (in degree) at fixed temperature and baryonic chemical potential has also been studied. We have also studied the effect of impact parameter and transverse momentum on differential scattering cross-section at $θ = 9 0^{\circ}$ .
hep-phnucl-thAdv.High Energy Phys.(2022)·7 citations
30*
Hadronic light-by-light scattering contribution to the muon $g - 2$ from lattice QCD: semi-analytical calculation of the QED kernel
Nils Asmussen🇬🇧 · En-Hung Chao🇩🇪 · Antoine Gérardin🇫🇷 · Jeremy R. Green🇩🇪 · Renwick J. Hudspith🇩🇪 · Harvey B. Meyer🇩🇪 · Andreas Nyffeler🇩🇪
Hadronic light-by-light scattering is one of the virtual processes that causes the gyromagnetic factor $g$ of the muon to deviate from the value of two predicted by Dirac's theory. This process makes one of the largest contributions to the uncertainty of the Standard Model prediction for the muon $(g - 2)$ . Lattice QCD allows for a first-principles approach to computing this non-perturbative effect. In order to avoid power-law finite-size artifacts generated by virtual photons in lattice simulations, we follow a coordinate-space approach involving a weighted integral over the vertices of the QCD four-point function of the electromagnetic current carried by the quarks. Here we present in detail the semi-analytical calculation of the QED part of the amplitude, employing position-space perturbation theory in continuous, infinite four-dimensional Euclidean space. We also provide some useful information about a computer code for the numerical implementation of our approach that has been made public at https://github.com/RJHudspith/KQED.
↳ hep-lathep-phhep-thJHEP(2023)·21 citations
31*
Modelling Cosmic Springs with Finsler and Generalised Finsler Geometries
Matthew J. Lake🇩🇪
We show that the equations of motion governing the dynamics of strings in a compact internal space can be written as dispersion relations, with a local speed that depends on the velocity and curvature of the string in the large dimensions. From a $(3 + 1)$ -dimensional perspective these can be viewed as dispersion relations for waves propagating in the string interior and are analogous to those for current-carrying topological defects. This allows us to construct a unified framework with which to study and interpret the internal structure of various field-theoretic and fundamental string species, in a simple physically intuitive coordinate system, without the need for dimensional reduction or approximate effective actions. This, in turn, allows us to identify the precise conditions under which higher-dimensional strings and current-carrying defects are observationally indistinguishable, for macroscopic observers. Our approach naturally incorporates the description of so-called `cosmic springs', whose dynamics are expressed in terms of an effective Finsler geometry, for circular loops, or generalised Finsler geometry, for non-circular configurations. This demonstrates the importance of these novel geometric structures and their utility in modelling complex physical phenomena in cosmology and astrophysics.
↳ hep-thgr-qchep-phSymmetry(2022)·0 citations
32*
Implications of photon-ALP oscillations in the extragalactic neutrino source TXS 0506+056 at sub-PeV energies
Bhanu Prakash Pant🇮🇳 · Sunanda🇮🇳 · Reetanjali Moharana🇮🇳 · Sarathykanan S🇮🇳
Photon-axion-like particle (ALP) oscillations result in the survival of gamma rays from distant sources above TeV energies. Studies of events observed by CAST, Fermi-LAT, and IACT have constrained the ALP parameters. We investigate the effect of photon-ALP oscillations on the gamma-ray spectra of the first extragalactic neutrino source, TXS 0506+056, for observations by Fermi-LAT and MAGIC around the IC170922-A alert. We obtain a constraint on the ALP coupling parameter $g_{aγ} < 5 \times 1 0^{- 11}$ GeV $^{- 1}$ with 95% C.L. when focusing on the ALP mass range 0.1 neV $\leq$ $m_{a}$ $\leq$ 1000 neV. Importantly, we study the implications of ALP- $γ$ oscillations on the counterpart $γ$ rays of the sub-PeV neutrinos observed from TXS 0506+056. We also show the diffuse $γ$ -ray fluxes and observabilities from flat-spectrum radio quasars, high-synchrotron peaked sources, and low-intermediate-synchrotron peaked sources, assuming similar gamma-ray emissions as that from TXS 0506+056.
↳ astro-ph.HEhep-phPRD(2023)·10 citations
33*
Ab-initio study of dibaryons with highest bottom number
M. Padmanath · Nilmani Mathur🇮🇳 · Debsubhra Chakraborty🇮🇳
We present the first lattice study of dibaryons with highest bottom number. Utilizing a set of state-of-the-art lattice QCD ensembles and methodologies, we determine the ground state of dibaryon composed of two $Ω_{bbb}$ baryons. We extract the related scattering amplitude in the $^{1} S_{0}$ channel and find a sub-threshold pole, which signifies an unambiguous evidence for a deeply bound $Ω_{bbb} - Ω_{bbb}$ dibaryon. The binding energy of such a state as dictated by this pole singularity is found to be -81( $_{- 16}^{+ 14}$ ) MeV. We quantify various systematic uncertainties involved in this determination, including those related to the excited state contamination and Coulomb repulsion between the bottom quarks.
↳ hep-lathep-phPoS(2023)·2 citations
34*
Long-range multiparticle interactions induced by neutrino exchange in neutron-star matter
M. I. Krivoruchenko🇷🇺
Forces with a large radius of interaction can have a significant impact on the equation of state of matter. Low-mass neutrinos generate a long-range potential due to the exchange of neutrino pairs. We discuss a possible relationship between the neutrino masses, which determine the interaction radius of the neutrino-pair exchange potential, and the equation of state of neutron matter. Contrary to previous statements, the thermodynamic potential, when decomposed into the number of neutrino interactions, vanishes in any decomposition order, except for the interaction of two neutrons. In the one-loop approximation, long-range multiparticle neutrino interactions are stable in the infrared region for all neutrino masses and do not affect the equation of state of neutron matter or the stability of neutron stars.
↳ nucl-thhep-phPisma Zh.Eksp.Teor.Fiz.(2023)·0 citations
35*
Study of $I = 0$ bottomonium bound states and resonances based on lattice QCD static potentials
Pedro Bicudo🇵🇹 · Nuno Cardoso🇵🇹 · Lasse Mueller🇩🇪 · Marc Wagner🇩🇪
We investigate $I = 0$ bottomonium bound states and resonances in S, P, D and F waves using lattice QCD static-static-light-light potentials. We consider five coupled channels, one confined quarkonium and four open $B^{(*)} B ˉ^{(*)}$ and $B_{s}^{(*)} B ˉ_{s}^{(*)}$ meson-meson channels and use the Born-Oppenheimer approximation and the emergent wave method to compute poles of the T matrix. We discuss results for masses and decay widths and compare them to existing experimental results. Moreover, we determine the quarkonium and meson-meson composition of these states to clarify, whether they are ordinary quarkonium or should rather be interpreted as tetraquarks.
↳ hep-lathep-phPoS(2023)·3 citations
36*
Ultrahigh-energy cosmic-ray signature in GRB 221009A
Saikat Das🇯🇵 · Soebur Razzaque🇿🇦
The brightest long gamma-ray burst detected so far by the Swift-BAT and Fermi-GBM telescopes, GRB~221009A, provides an unprecedented opportunity for understanding the high-energy processes in extreme transient phenomena. We find that the conventional leptonic models, synchrotron and synchrotron-self-Compton, for the afterglow emission from this source have difficulties explaining the observation of $≳ 10$ TeV $γ$ rays, by the LHAASO detector, and extending up to 18 TeV energies. We model $γ$ -ray spectrum estimated in the energy range 0.1-1 GeV by the Fermi-LAT detector. The flux predicted by our leptonic models is severely attenuated at $> 1$ TeV due to $γ γ$ pair production with extragalactic background light, and hence an additional component is required at $≳ 10$ TeV. Ultrahigh-energy cosmic rays can be accelerated in the GRB blastwave, and their propagation induces an electromagnetic cascade in the extragalactic medium. The line of sight component of this flux can explain the emission at $≳ 10$ TeV detected by LHAASO, requiring a fraction of the GRB blastwave energy in ultrahigh-energy cosmic rays. This could be an indication of ultrahigh-energy cosmic-ray acceleration in GRBs.
↳ astro-ph.HEhep-phAstron.Astrophys.(2023)·46 citations
37*
Bridging Machine Learning and Sciences: Opportunities and Challenges
Taoli Cheng🇨🇦
The application of machine learning in sciences has seen exciting advances in recent years. As a widely applicable technique, anomaly detection has been long studied in the machine learning community. Especially, deep neural nets-based out-of-distribution detection has made great progress for high-dimensional data. Recently, these techniques have been showing their potential in scientific disciplines. We take a critical look at their applicative prospects including data universality, experimental protocols, model robustness, etc. We discuss examples that display transferable practices and domain-specific challenges simultaneously, providing a starting point for establishing a novel interdisciplinary research paradigm in the near future.
↳ stat.MLcs.LGhep-exhep-ph+11 citation
38*
Quantifying uncertainties in general relativistic magnetohydrodynamic codes
Pedro Luis Espino · Gabriele Bozzola🇺🇸 · Vasileios Paschalidis🇺🇸
In this paper, we show that similar open-source codes for general relativistic magnetohydrodynamic (GRMHD) produce different results for key features of binary neutron star mergers. First, we present a new open-source version of the publicly available IllinoisGRMHD code that provides support for realistic, finite temperature equations of state. After stringent tests of our upgraded code, we perform a code comparison between GRHydro, IllinoisGRMHD, Spritz, and WhiskyTHC, which implement the same physics, but slightly different computational methods. The benefit of the comparison is that all codes are embedded in the EinsteinToolkit suite, hence their only difference is algorithmic. We find similar convergence properties, fluid dynamics, and gravitational waves, but different merger times, remnant lifetimes, and gravitational wave phases. Such differences must be resolved before the post-merger dynamics modeled with such simulations can be reliably used to infer the properties of nuclear matter especially in the era of precision gravitational wave astronomy.
↳ gr-qcastro-ph.HEastro-ph.SRhep-phPRD(2023)·26 citations
39*
Exotic Compact Objects with Two Dark Matter Fluids
Marie Cassing🇩🇪 · Alexander Brisebois🇨🇦 · Muhammad Azeem🇨🇦 · Jürgen Schaffner-Bielich🇩🇪
The generic properties of compact objects made of two different fluids of dark matter are studied in a scale invariant approach. We investigate compact objects with a core-shell structure, where the two fluids are separated, and with mixed dark matter components, where both dark matter fluids are immersed within each other. The constellations considered are combinations of incompressible fluids, free and interacting Fermi gases, and equations of state with a vacuum term, i.e. self-bound dark matter. We find novel features in the mass-radius relations for combined dark matter compact objects which distinguishes them from compact objects with a single dark matter fluid and compact stars made of ordinary baryonic matter, as white dwarfs, neutron stars and quark stars. The maximum compactness of certain combined dark matter stars can reach values up to the causality limit for compact stars but not beyond that limit if causality of the dark matter fluids is ensured.
↳ gr-qcastro-ph.HEhep-phnucl-thApJ(2023)·26 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.