HEP Phenomenology·hep-ph

Mon·Jul 1, 2024Monday·July 1, 2024

17 papers—14 primary·3 cross-listed·reconstructed*

01*
Heavy quarkonium spectral function in the spinning black hole background
Zhou-Run Zhu🇨🇳 · Manman Sun🇨🇳 · Rui Zhou🇨🇳 · Zhuang Ma🇨🇳 · Jinzhong Han🇨🇳
In this paper, we study the dissociation of heavy quarkonium in the spinning black hole background. Specifically, we analyze the spectral function of charmonium and bottomonium in the spinning black hole background and examine how the angular momentum affects the dissociation of $J /Ψ$ and $Υ (1 S)$ . From the results, we find that the angular momentum and temperature decreases the peak height and expands the peak width of the spectral function, thereby enhancing the dissociation of heavy vector mesons. Moreover, the angular momentum has a stronger dissociation effect in the transverse orientation, revealing the directional influence of angular momentum.
hep-phEPJC(2024)·12 citations
02*
Refined approaches in second leptogenesis for the baryon-lepton asymmetry discrepancy
YeolLin ChoeJo🇰🇷 · Kazuki Enomoto🇰🇷 · Yechan Kim🇰🇷 · Hye-Sung Lee🇰🇷
The temperature-dependent mass of the heavy neutrino can lead to the second leptogenesis occurring below the electroweak scale, potentially explaining the large discrepancy between baryon and lepton asymmetries. We investigate this scenario further, exploring the intricate interplay of the weak interaction processes within this framework. It includes notable shifts in the dominant decay channels of heavy neutrinos around the electroweak symmetry breaking, along with the resonance behavior of the scattering processes near the $W / Z$ mass. The $C P$ asymmetry can also vary over cosmic history due to the temperature-dependent mass, allowing the $B - L$ asymmetry generation to be amplified in the late epoch. These findings elucidate how such alterations in the dynamics of second leptogenesis contribute to addressing the observed discrepancies in baryon-lepton asymmetry.
hep-phastro-ph.COPRD(2025)·5 citations
03*
Pseudoscalar heavy quarkonium production in heavy ion ultraperipheral collision
Jun Jiang🇨🇳 · Shi-Yuan Li🇨🇳 · Xiao Liang🇨🇳 · Yan-Rui Liu🇨🇳 · Cong-Feng Qiao🇨🇳 · Zong-Guo Si🇨🇳 · Hao Yang🇨🇳
The inclusive production of pseudoscalar heavy quarkoniua ( $η_{c}, η_{b}$ and $B_{c}$ ) via photon-photon fusion in heavy ion ultraperipheral collision (UPC) are calculated to QCD next-to-leading order in the framework of non-relativistic QCD (NRQCD). The total cross section of $η_{c}$ produced in Pb-Pb UPC is 194 $nb$ and 1275 $nb$ at nucleon-nucleon c.m. energies $S_{NN} =$ 5.52 TeV and 39.4 TeV, respectively. The cross sections for $η_{b}$ and $B_{c}$ mesons are more than two to three orders of magnitude smaller. We make a detailed phenomenological analysis on the $η_{c}$ production; the uncertainties caused by the renormalization scale and the charm quark mass, the cross sections in other ultraperipheral nucleon-nucleon colliding systems, and the transverse momentum distribution are discussed. At the coming HL-LHC and future FCC, the heavy ion UPC opens another door of the study on the production of heavy quarkonium.
hep-phhep-exPRD(2024)·5 citations
04*
Large quark mass Euler-Heisenberg type action for QCD with quark sources and its Abelian limit
Igor de M. Froldi🇧🇷 · Fabio L. Braghin🇧🇷
The quark determinant in the presence of a background gluon field is calculated in a large quark mass approach within a derivative expansion by considering quark sources. The resulting low-energy QCD Effective Field Theory (EFT) is valid for non-homogeneous fields and it presents, besides the usual Euler-Heisenberg type gluon self-interactions, different types of corrections to the minimal quark-gluon interaction among which there are several imaginary terms. The Abelian limit of this effective action, i.e. an expanded Euler-Heisenberg effective action with fermion sources, is also found and it is shown to contain, therefore, corrections to the fermion-photon interactions, including imaginary terms. Different resulting properties are calculated such as: their contributions to the energy-momentum tensor and its trace, the Poynting vector, the chromo-electric permittivity and chromo-magnetic permeability. Conditions for these quantities, as well as for the corresponding Abelian limits, to be real are exhibited.
hep-phhep-thInt.J.Mod.Phys.A·2 citations
05*
The $L_{μ} - L_{τ}$ solution to the IceCube Ultra High Energy neutrino deficit in light of NA64
Leon M.G. de la Vega🇲🇽 · Eduardo Peinado🇲🇽 · Jose Wudka🇺🇸
In this work we analyze the scenario where a MeV scale $L_{μ} - L_{τ}$ gauge boson can explain the deficit in the diffuse ultra high energy (UHE) astrophysical neutrino spectrum observed in IceCube, as well as the discrepancy between experimental and $e^{+} e^{-}$ dispersion data driven SM calculations of the muon anomalous magnetic moment. We map the parameter space of the model where the elastic resonant s-channel scattering of UHE neutrinos with the cosmic neutrino background, mediated by the new Z', can improve the description of the observed cascade and track spectra over the no-scattering hypothesis. Comparing to recent NA64 $μ$ results, we find that some part of the parameter space remains unexplored, but at a data volume of $1 0^{11}$ muons on target NA64 $μ$ will completely probe this region.
hep-phPRD(2024)·4 citations
06*
A determination of FL at xmin with HERA data
Frank E. Taylor🇺🇸
It is well known that there are persistent statistical tensions with the standard model in the low Q2 HERA deep inelastic scattering neutral current data characterized by a turn-over of F2(x, Q2) at low x and low Q2. One important experimental signature that sheds light on this low Q2 region is the determination of the longitudinal structure function FL(x, Q2). This paper describes a novel method to determine FL based on an extrapolation of the reduced NC cross section at fixed s and Q to the minimum value of x given by Q2/s. At this kinematic point, the reduced cross section equals 2xF1 = F2 - FL so that a determination of both this value and the value of F2, determines FL. Since the polarization of the exchanged photon is transverse at this kinematic point, we expect FL to be small because its dominate gluon component is strongly suppressed. Surprisingly, we find FL at low Q2 to be much larger than expectation and observe that both FL and F2 at x = Q2/s show several properties consistent with the dipole picture. We discuss the statistical as well as chief systematic errors of our method and we tabulate our determinations of F2, 2xF1 and FL in the Appendix.
hep-phPRD(2025)·9 citations
07*
Next-to-leading-order QCD corrections to nucleon Dirac form factors
Long-Bin Chen🇨🇳 · Wen Chen🇨🇳 · Feng Feng🇨🇳 · Siwei Hu🇨🇳 · Yu Jia🇨🇳
The leading-order perturbative QCD (pQCD) predictions to nucleon electromagnetic form factors were first made in late 70s. In this Letter for the first time we accomplish the calculation of the next-to-leading-order (NLO) QCD corrections to nucleon's Dirac form factors at large momentum transfer, to the leading-twist accuracy in collinear factorization approach, specifically within the Krankl and Manashov renormalization scheme. The effect of NLO perturbative corrections turns out to be positive and substantial. Taking the nucleon leading-twist light-cone-distribution amplitudes (LCDAs) determined from the recent lattice simulations as input, we find that the state-of-the-art pQCD predictions significantly underestimate the available nucleon Dirac form factors in both space-like and time-like domains. This nuisance indicates that some additional soft nonfactorizable contribution might be called for to account for the measured nucleon electromagnetic form factor data up to $Q^{2} \approx 30 Ge V^{2}$ .
hep-phhep-exhep-latPRL(2025)·13 citations
08*
On Bjorken sum rule with analytic coupling
I.R. Gabdrakhmanov🇷🇺 · N.A Gramotkov🇷🇺 · A.V. Kotikov🇷🇺 · O.V. Teryaev🇷🇺 · D.A. Volkova🇷🇺 · I.A. Zemlyakov🇨🇱
We present the results of [1], where good agreement was obtained between calculations within the framework of analytic QCD and experimental data on polarized Bjorken sum rule. The photoproduction limit was also considered and a new representation of the perturbative contribution to the polarized Bjorken sum rule was obtained.
hep-phPhys.Part.Nucl.(2025)·3 citations
09*
A new method for finding more symmetry relations of Feynman integrals
Zihao Wu🇨🇳 · Yang Zhang🇨🇳
We introduce a new method for deriving Feynman integral symmetry relations. By solving the ansatz of momentum transformation in the field of rational functions rather than constants, this method can sometimes find more symmetry relations, compared to some state-of-the-art software. The new method may help to further decrease the number of unique sectors in an integral family. Well-chosen gauge conditions are implemented in this method for the efficient symmetry searching.
hep-phComput.Phys.Commun.(2025)·10 citations
10*
Correlating $0 ν β β$ decays and flavor observables in leptoquark models
S. Fajfer🇸🇮 · L.P.S. Leal🇧🇷 · O. Sumensari🇫🇷 · R. Zukanovich Funchal🇧🇷
In this paper, we investigate minimal scalar leptoquark models that dynamically generate neutrino Majorana masses at the one-loop level and examine their implications for low-energy processes. We show that these models can produce viable neutrino masses, consistent with neutrino oscillation and cosmological data. By using leptoquark couplings fixed by neutrino data, we predict additional contributions to neutrinoless double-beta decays ( $0 ν β β$ ), which are chirality enhanced and compete with the standard contributions from the Majorana masses. Our analysis demonstrates that these effects are sizable for leptoquark masses as large as $O (300 TeV)$ , potentially increasing or decreasing the $0 ν β β$ half-life, and creating an ambiguity between the normal and inverted mass ordering scenarios. Furthermore, we explore the correlation between $0 ν β β$ and flavor observables, such as kaon decays and $μ \to e$ conversion in nuclei, emphasizing that the latter is complementary to $0 ν β β$ decays.
hep-phhep-exJHEP(2025)·8 citations
11*
Non-thermal production of heavy vector dark matter from relativistic bubble walls
Wen-Yuan Ai🇬🇧 · Malcolm Fairbairn🇬🇧 · Ken Mimasu🇬🇧 · Tevong You🇬🇧
Heavy vector boson dark matter at the TeV scale or higher may be produced non-thermally in a first-order phase transition taking place at a lower energy scale. While the production of vector dark matter has previously been studied for bubble wall collisions, here we calculate production by bubble wall expansion in a plasma, which can be the dominant production mechanism. We compute the results numerically and provide an analytical fit for the vector dark matter density. The numerical fit is also validated for scalar dark matter production, obtaining results in agreement with past literature. We find that vector pair production leads to bubble wall friction with a novel boost factor scaling behaviour compared to transition radiation emission of a single vector. We conclude that TeV-scale WIMP vector dark matter can be efficiently produced non-thermally by first-order phase transitions in a wide region of parameter space where thermal freeze-out is inefficient. In this scenario, the phase transition scale is predicted to be in the sub-GeV to $O (10)$ TeV range and could therefore be accessible to future gravitational wave detectors.
hep-phastro-ph.COJHEP(2025)·27 citations
12*
Tau Tridents at Accelerator Neutrino Facilities
Innes Bigaran🇺🇸 · P. S. Bhupal Dev🇺🇸 · Diego Lopez Gutierrez🇺🇸 · Pedro A. N. Machado🇺🇸
We present the first detailed study of Standard Model neutrino tridents involving tau leptons at the near detectors of accelerator neutrino facilities. The rates of these processes were previously thought to be negligible, even at future facilities. Our full $2 \to 4$ calculation, including both coherent and incoherent scatterings, reveals that the DUNE near detector could observe a considerable number of tau tridents, which is an important background to new physics searches. We identify promising kinematic features that may allow distinction of tau tridents from the usual neutrino charged-current background at DUNE, and thus establish the observation of tau tridents for the first time. We also comment on the detection prospects at other accelerator and collider neutrino experiments.
hep-phhep-exPRD(2025)·11 citations
13*
QCD Phase Diagram and the Finite Volume Fireball: A Model Study
Adiba Shaikh🇮🇳 · Ranjita K. Mohapatra🇮🇳 · Saumen Datta🇮🇳
Experimental investigations of the phase diagram of strongly interacting matter involve collisions of heavy ions at ultrarelativistic velocities. The medium created in such a collision is often of dimensions a few fermi, in particular in the Beam Energy Scan experiments. An understanding of the effect of the finite volume and the boundary is important for connecting the experimental results to the phase diagram. Using the Nambu Jona-Lasinio model, an effective theory for the chiral transition of quantum chromodynamics (QCD), we have studied the effect of the finite volume of the fireball on the transition line at finite temperature and density using the MIT boundary condition to mimic the condition that the system is deconfined inside. The shift of the transition temperature for finite volume and finite volume effect on number density and its susceptibilities are studied. The volume effects should be considered when looking for signatures of the phase diagram in experiments.
hep-phnucl-thNPA(2025)·7 citations
14*
On Wigner Degeneracy in Elko theory: Hermiticity and Dark Matter
G. B. de Gracia🇧🇷 · Roldão da Rocha🇧🇷 · R. J. Bueno Rogerio🇧🇷 · Cheng-Yang Lee🇨🇳
In this paper, we provide a set of Hermitian interactions for quantum fields based on Elko, considering the recent achievements concerning the most general form of singular spinors and Wigner degeneracy. We consider Hermiticity and renormalizability a criterion to define the derivative Elko-Higgs interaction as the suitable candidate for a dark coupling. Then, the free parameters of the model are fixed by cosmological constraints on the dark matter abundance, bounds on the Higgs invisible decays, and limits on the electron-dark matter scattering mediated by the Higgs.
hep-phhep-thPhys.Dark Univ.(2025)·10 citations
15*
QCD with background electromagnetic fields on the lattice: a review
Gergely Endrodi🇩🇪
This review provides a comprehensive summary of results on the physics of strongly interacting matter in the presence of background electromagnetic fields, obtained via numerical lattice simulations of the underlying theory, Quantum Chromodynamics (QCD). Lattice QCD has guided our understanding of magnetized quarks and gluons via landmark results on the phase diagram, the equation of state, the confinemenent mechanism, anomalous transport phenomena as well as many more fascinating effects. Some of the lattice results lead to completely new paradigms in the description of hot magnetized quark matter and provided useful insights to a broad high-energy particle physics community. Since the first lattice QCD simulations with background fields, this field has been established as an independent research direction. We present the current status and recent developments of this field, together with an outlook including open questions to be answered in the near future.
↳ hep-lathep-phhep-thnucl-thPPNP(2025)·77 citations
16*
Lanczos, the transfer matrix, and the signal-to-noise problem
Michael L. Wagman🇺🇸
This work introduces a method for determining the energy spectrum of lattice quantum chromodynamics (LQCD) by applying the Lanczos algorithm to the transfer matrix and using a bootstrap generalization of the Cullum-Willoughby method to filter out spurious eigenvalues. Proof-of-principle analyses of the simple harmonic oscillator and the LQCD proton mass demonstrate that this method provides faster ground-state convergence than the "effective mass," which is related to the power-iteration algorithm. Lanczos provides more accurate energy estimates than multi-state fits to correlation functions with small imaginary times while achieving comparable statistical precision. Two-sided error bounds are computed for Lanczos results and guarantee that excited-state effects cannot shift Lanczos results far outside their statistical uncertainties.
↳ hep-lathep-phnucl-thPRL(2025)·43 citations
17*
Curbing PBHs with PTAs
A.J.Iovino🇮🇹 · G.Perna🇨🇭 · A. Riotto🇨🇭 · H. Veermäe🇪🇪
Sizeable primordial curvature perturbations needed to seed a population of primordial black holes (PBHs) will be accompanied by a scalar-induced gravitational wave signal that can be detectable by pulsar timing arrays (PTA). We derive conservative bounds on the amplitude of the scalar power spectrum at the PTA frequencies and estimate the implied constraints on the PBH abundance. We show that only a small fraction of dark matter can consist of stellar mass PBHs. The strength and the shape of the constraint depend on the shape of the power spectrum and the nature of the non-Gaussianities. We find that constraints on the PBH abundance arise in the mass range $0.1 - 1 0^{3} M_{⊙}$ , with the sub-solar mass range being constrained only for narrow curvature power spectra. These constraints are softened when positive non-Gaussianity is introduced and can be eliminated when $f_{NL} ≳ 5$ . On the other hand, if the PBH abundance is computed via the theory of peaks, the PTA constraints on PBHs are relaxed, signalling once more the theoretical uncertainties in assessing the PBH abundance. We further discuss how strong positive non-Gaussianites can allow for heavy PBHs to potentially seed supermassive BHs.
↳ astro-ph.COgr-qchep-phJCAP(2024)·68 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.