Wed·Aug 10, 2022Wednesday·August 10, 2022

1. 01*

   LHC constraints on electroweakino dark matter revisited

   Trygve Buanes🇳🇴 · Iñaki Lara🇵🇱 · Krzysztof Rolbiecki🇵🇱 · Kazuki Sakurai🇵🇱

   We revisit LHC searches for heavy invisible particles by exploiting QCD initial state radiation. We recast a dijet signal region in a general multijet plus MET search by ATLAS. We find that non-trivial mass limit can be obtained for various models of the electroweakino sector with the present data in hadronic channels. The winos are bound to be heavier than $m_{\tilde{W}}\gtrsim 160$ GeV and higgsinos $m_{\tilde{h}}\gtrsim 100$ GeV, depending on the chargino-neutralino mass splitting. The expected exclusion limits at the LHC Run 3 with $\mathcal{L}=300$ fb${}^{-1}$ increase to $m_{\tilde{W}}\gtrsim 200$ GeV and $m_{\tilde{h}}\gtrsim 130$ GeV for winos and higgsino, respectively. This is the first LHC limit for promptly decaying nearly mass-degenerate winos.

   hep-phhep-exPRD(2023)·13 citations
2. 02*

   $W$ + charm associated hadroproduction: relevance of Shower Monte Carlo effects

   G. Bevilacqua🇭🇺 · M. V. Garzelli🇩🇪 · A. Kardos🇭🇺 · L. Toth🇭🇺

   Data on $W+D$-meson and $W+c$-jet hadroproduction have recently started to be included in at least some of the parton distribution function fits, mainly because of their potential to constrain the strange quark content of the proton. In this contribution we present predictions for $W+D$-meson and $W+c$-jet production with NLO QCD accuracy matched to parton shower. We show how including the latter effects, as well as hadronization, beam remnant and multiple parton interaction effects present in Shower Monte Carlo codes, is fundamental to provide consistent comparisons with the current experimental data by the ATLAS and CMS collaborations, as required for non-biased extractions of the strange and antistrange quark PDFs.

   hep-ph0 citations
3. 03*

   Hadronic structure on the light-front V. Diquarks, Nucleons and multiquark Fock components

   Edward Shuryak🇺🇸 · Ismail Zahed🇺🇸

   This work is a continuation in our series of papers, that addresses quark models of hadronic structure on the light front, motivated by the QCD vacuum structure and lattice results. In this paper we focus on the importance of diquark correlations, which we describe by a quasi-local four-fermion effective 't Hooft interaction induced by instantons. The same interaction is also shown to generate extra quark-antiquark pair of the "sea". Its higher order iteration can be included via "pion-mediation": both taken together yield a quantitative description of the observed flavor asymmetry of antiquarks sea. Finally we discuss the final step needed to bridge the gap between hadronic spectroscopy and parton observables, by forward DGLAP evolution towards the chiral upper scale of $\sim 1{\mathrm{GeV}}^2$.

   hep-phnucl-thPRD(2023)·18 citations
4. 04*

   Quark spin content of SU(3) light and singly heavy baryons

   Jung-Min Suh🇰🇷 · June-Young Kim🇩🇪 · Ghil-Seok Yang🇰🇷 · Hyun-Chul Kim🇰🇷

   We investigate the quark spin content of the SU(3) baryon octet, decuplet, antitriplet, and sextet in a pion mean-field approach or the chiral quark-soliton model, considering the $1/N_c$ rotational corrections and SU(3) symmetry breaking effects. We compare the present results with those from various theoretical works and lattice QCD.

   hep-phPRD(2022)·13 citations
5. 05*

   ee\gamma production at photon-photon colliders at complete electroweak NLO accuracy

   He-Yi Li🇨🇳 · Ren-You Zhang🇨🇳 · Wen-Gan Ma🇨🇳 · Yi Jiang🇨🇳 · Xiao-Zhou Li🇨🇳

   We present the NLO electroweak radiative corrections to the ee\gamma production in \gamma\gamma collision, which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider. We analyze the dependence of the total cross section on the beam colliding energy, and then investigate the kinematic distributions of final particles at various initial photon beam polarizations at EW NLO accuracy. The numerical results indicate that the EW relative corrections to the total cross section are non-negligible and become increasingly significant as the increase of the beam colliding energy. Such EW corrections are very important and should be taken into consideration in precision theoretical and experimental studies at high-energy \gamma\gamma colliders.

   hep-phCPC(2022)·1 citation
6. 06*

   Dual Parton Model for the Charged Multiplicity in pp Collisions at 13, 13.6 TeV and for future LHC energy of 27 TeV

   Pranay K. Damuka🇮🇳 · R. Aggarwal🇮🇳 · M. Kaur🇮🇳

   Analysis of the charged multiplicity in proton-proton inelastic interactions at the LHC energies in the setting of Dual Parton Model is presented. Data from the CMS experiment and the data simulated at different energies in various pseudo-rapidity windows using the event generator PYTHIA8are analysed and compared with the calculations from the model. Each inelastic scattering is assumed to follow the Poisson distribution. The theoretical Koba-Nielsen-Olesen (KNO) scaling of the multiplicity distributions is studied and compared with previously published experimental results at $\sqrt{s}$ = 0.9, 2.36, 7 TeV. Predictions from the model for the KNO distributions at $\sqrt{s}$ = 13, 13.6 TeV and for the future LHC energy of 27 TeV are computed and compared with the simulated data.

   hep-phPRD(2022)·2 citations
7. 07*

   Sensitivities on dark photon from the Forward Physics Experiments

   Kingman Cheung🇹🇼 · C.J. Ouseph🇹🇼

   Neutrino-electron scattering experiments can explore the potential presence of a light gauge boson $A^{\prime }$ which arises from an additional $U(1{)}_{B-L}$ group, or a dark photon $A^{\prime }$ which arises from a dark sector and has kinetic mixing with the SM hypercharge gauge field. We generically call it a dark photon. In this study, we investigate the effect of the dark photon on neutrino-electron scattering $\nu e^{-}\to \nu e^{-}$ at the newly proposed forward physics experiments such as FASER$\nu$, FASER$\nu 2$, SND@LHC and FLArE(10 tons). We estimate the anticipated sensitivities to the $U(1{)}_{B-L}$ gauge coupling in a wide range of the dark photon mass $M_{A^{\prime }}$. We compare the sensitivities of the proposed forward physics experiments with the current limits from TEXONO, GEMMA, BOREXINO, LSND, and CHARM II as well as NA64e experiments. We also extend the calculation to obtain the sensitivities on the kinetic mixing parameter $ϵ$ in a wide range of dark photon mass $M_{A^{\prime }}$. We demonstrate that the sensitivities do not improve for $M_{A^{\prime }}<1$ GeV at the Forward Physics Facilities.

   hep-phhep-exJHEP(2022)·7 citations
8. 08*

   Implications of the QCD dynamics and a Super-Glashow astrophysical neutrino flux on the description of ultrahigh energy neutrino data

   Victor P. Goncalves🇧🇷 · Diego R. Gratieri🇧🇷 · Alex S. C. Quadros🇧🇷

   The number of events observed in neutrino telescopes depends on the neutrino fluxes in the Earth, their absorption while crossing the Earth and their interaction in the detector. In this paper, we investigate the impact of the QCD dynamics at high energies on the energy dependence of the average inelasticity and angular dependence of the absorption probability during the neutrino propagation through the Earth, as well in the determination of the properties of the incident astrophysical neutrino flux. Moreover, the number of events at the IceCube and IceCube - Gen2 are estimated considering different scenarios for the QCD dynamics and assuming the presence of a hypothetical Super - Glashow flux, which peaks for energies above the Glashow resonance.

   hep-phastro-ph.HEEPJC(2022)·9 citations
9. 09*

   QED vacuum nonlinearity in Laguerre-Gauss beams

   Cesim K. Dumlu🇷🇴 · Yoshihide Nakamiya🇷🇴 · Kazuo A. Tanaka🇷🇴

   We investigate in detail the stimulated photon emission in pulse-shaped Laguerre-Gauss beams of arbitrary mode decomposition within the framework of Euler-Heisenberg effective theory. We elaborate on the analytic structure of the photon emission amplitude and identify its dominant and sub-dominant parts by analyzing each signature's phase scaling. We identify three distinct nonlinear signatures: the orbital angular momentum (OAM) flip ($\ell :1\to -1$) , higher harmonic generation ($\ell :1\to 2$) and harmonic reduction ($\ell :1\to 0$). We estimate signal photon yield for each signature under various pulse collision scenarios we explain in detail. We also outline a prospective experimental setup that may probe these signatures.

   hep-phhep-thphysics.opticsPRD(2022)·10 citations
10. 10*

    Momentum broadening of heavy quarks and jets in the Glasma from classical colored particle simulations

    Dana Avramescu🇷🇴 · Virgil Băran🇷🇴 · Vincenzo Greco🇮🇹 · Andreas Ipp🇦🇹 · David. I. Müller🇦🇹 · Marco Ruggieri🇨🇳

    We investigate the effects of the pre-equilibrium Glasma stage of heavy-ion collisions on the broadening of momentum for heavy quarks and jets using classical colored particle simulations based on Wong's equations. Confirming previous studies, we find that these probes accumulate momentum on the order of the saturation scale $Q_s$ and that the color field of the Glasma induces an anisotropy with more broadening along the beam axis. For quark jets the anisotropy is more pronounced at lower energies.

    hep-phhep-latnucl-thActa Phys.Polon.Supp.(2023)·1 citation
11. 11*

    Automated Calculation of Beam Functions at NNLO

    Guido Bell🇩🇪 · Kevin Brune🇩🇪 · Goutam Das🇩🇪 · Marcel Wald🇩🇪

    We present an automated framework for the calculation of beam functions that describe collinear initial-state radiation at hadron colliders at next-to-next-to leading order (NNLO) in perturbation theory. By exploiting the infrared behaviour of the collinear matrix elements, we factorise the phase-space singularities with suitable observable-independent parametrisations. Our numerical approach applies to a large class of collider observables, and as a check of its validity, we compute the quark beam functions for transverse-momentum resummation and N-jettiness, which are known analytically at this order, finding excellent agreement.

    hep-phPoS(2022)·5 citations
12. 12*

    Non-factorizable charming loops in FCNC B decays vs B-decay semileptonic form factors

    Dmitri Melikhov🇷🇺

    We compare a non-factorizable charming-loop correction to an exclusive FCNC $B$-decay given in terms of the 3-particle Bethe-Salpeter amplitude (3BS) of the $B$-meson, $⟨0|\bar{q}(x)G_{\mu \nu }(z)b(0)|B(p)⟩$, with the corresponding correction to the $B$-meson semileptonic form factor. In spite of certain similarities, these two corrections are shown to have substantial differences: The form factor correction is dominated by the collinear light-cone configuration of 3BS: $z_{\mu }=u{x}_{\mu }$, $0<u<1$, $x^2=0$. In contrast, the FCNC amplitude is dominated by a different configuration with non-collinear arguments: $x^2=0$, $z^2=0$, but $(x-z{)}^2\ne 0$ (i.e., $z_{\mu }\ne u{x}_{\mu }$).

    hep-phPRD(2022)·11 citations
13. 13*

    Complete SMEFT predictions for four top quark production at hadron colliders

    Rafael Aoude🇧🇪 · Hesham El Faham🇧🇪 · Fabio Maltoni🇧🇪 · Eleni Vryonidou🇬🇧

    We study four top quark production at hadron colliders in the Standard Model Effective Field Theory (SMEFT). We perform an analysis at the tree-level, including all possible QCD- and EW-coupling orders and relevant dimension-six operators. We find several cases where formally subleading terms give rise to significant contributions, potentially providing sensitivity to a broad class of operators. Inclusive and differential predictions are presented for the LHC and a future $pp$ circular collider operating at $100$ TeV. We estimate the sensitivity of different operators and perform a simplified chi-square fit to set limits on SMEFT Wilson coefficients. In so doing, we assess the importance of including subleading terms and differential information in constraining new physics contributions. Finally, we compute the SMEFT predictions for the double insertion of dimension-six operators and scrutinise the possible enhancements to the sensitivity induced by a specific class of higher order terms in the EFT series.

    hep-phJHEP(2022)·51 citations
14. 14*

    Indirect Signals of Dark Matter Can Change Depending on Where You Look

    Hooman Davoudiasl🇺🇸 · Julia Gehrlein🇺🇸

    We propose that the nature of indirect signals of dark matter (DM) can depend on the Galactic environment they originate from. We demonstrate this possibility in models where DM annihilates into light mediators whose branching fractions depend on a long range force sourced by ordinary matter. In particular, electromagnetic signals of DM may only arise near the centers of galaxies where the ordinary matter densities, and hence astrophysical background levels, are high. We briefly discuss how our model could explain the Galactic Center gamma ray excess, without leaving much of a trace in baryon-poor environments, like dwarf spheroidal galaxies. Similar spatial dependence of indirect signals can also apply to models featuring metastable DM decay into light mediators.

    hep-phastro-ph.COPRD(2023)·5 citations
15. 15*

    Probing high scale seesaw and PBH generated dark matter via gravitational waves with multiple tilts

    Debasish Borah🇮🇳 · Suruj Jyoti Das🇮🇳 · Rishav Roshan🇰🇷

    We propose a scenario where a high scale seesaw origin of light neutrino mass and gravitational dark matter (DM) in MeV-TeV ballpark originating from primordial black hole (PBH) evaporation can be simultaneously probed by future observations of stochastic gravitational wave (GW) background with multiple tilts or spectral breaks. A high scale breaking of an Abelian gauge symmetry ensures the dynamical origin of the seesaw scale while also leading to the formation of cosmic strings responsible for generating stochastic GW background. The requirement of a correct DM relic in this ballpark necessitates the inclusion of a diluter as PBH typically leads to DM overproduction. This leads to a second early matter dominated epoch after PBH evaporation due to the long-lived diluter. These two early matter dominated epochs, crucially connected to the DM relic, lead to multiple spectral breaks in the otherwise scale-invariant GW spectrum formed by cosmic strings. We find interesting correlations between DM mass and turning point frequencies of GW spectrum which are within reach of several near future experiments like LISA, BBO, ET, CE, etc.

    hep-phastro-ph.CONPB(2024)·27 citations
16. 16*

    Hadronic $J/\psi$ Regeneration in Pb+Pb Collisions

    Joseph Dominicus Lap🇺🇸 · Berndt Müller🇺🇸

    We make use of published yields for $D$-mesons and $J/\psi$ in Pb+Pb collisions at ALICE and a schematic description of the expansion of the hadron gas to study $D$-meson collisions during the hadronic break-up phase as a production mechanism for charmonium in relativistic heavy ion collisions at the Large Hadron Collider. Our calculation is based on chemical reaction rates with thermal cross sections for an effective meson interaction among pseudoscalar and vector mesons. We find that due to regeneration, the newly measured $J/\psi$ yields are consistent with anywhere from roughly $25\%$ to $110\%$ of the total yield present at hadronization time. This allows us to bound the fractional abundance of $J/\psi$ immediately after hadronization: $0.28\le \frac{d{N}_0^{J/\psi }/dy}{d{N}_{\mathrm{eq}}^{J/\psi }/dy}\le 1.13$. Our results are robust under the relaxation of the particulars of our schematic description and imply that it will be difficult to distinguish regeneration during hadronization from regeneration by final-state hadronic interactions. Therefore, regeneration must be taken into account when modelling.

    ↳ nucl-thhep-phPLB(2023)·1 citation
17. 17*

    Spin-thermal shear coupling in relativistic nuclear collisions

    M. Buzzegoli🇺🇸 · F. Becattini🇮🇹 · G. Inghirami🇩🇪 · I. Karpenko🇨🇿 · A. Palermo🇮🇹

    The spin polarization measurements of particles emitted in heavy-ion collisions have opened the possibility for new phenomenological investigations of spin physics in relativistic fluids. The theoretical predictions of global polarization are in agreement with the data, but consistent discrepancies stand out for the local polarization. We show that the covariant theory of relativistic quantum fluids at local equilibrium implies an additional, non-dissipative contribution to the spin polarization vector, which is proportional to the thermal shear, which has been previously overlooked. This additional contribution, together with an improved approximation in the expansion of the local equilibrium density operator, restores the quantitative agreement between the theoretical predictions and the experimental data.

    ↳ nucl-thhep-phActa Phys.Polon.Supp.(2023)·9 citations
18. 18*

    Gravity in binary systems at the fifth and sixth post-Newtonian order

    J. Blümlein🇩🇪 · A. Maier🇩🇪 · P. Marquard🇩🇪 · G. Schäfer🇩🇪

    Binary sources of gravitational waves in the early inspiral phase are accurately described by a post-Newtonian expansion in small velocity and weak interaction. We compute the conservative dynamics to fifth and partial sixth order using a non-relativistic effective field theory. We give predictions for central observables and determine the required coefficients for the construction of an Effective One-Body Hamiltonian, extending the applicability of our results to the late inspiral and merger phases.

    ↳ gr-qchep-phPoS(2022)·6 citations
19. 19*

    Primordial black holes induced stochastic axion-photon oscillations in primordial magnetic field

    Hai-Jun Li🇨🇳

    Primordial black holes (PBHs) can be produced in the very early Universe due to the large density fluctuations. The cosmic background of axion-like particles (ALPs) could be non-thermally generated by PBHs. In this paper, we investigate the ALPs emitted by ultra-light PBHs with the mass range $10\mathrm{g}\lesssim M_{\mathrm{PBH}}\lesssim 10^9\mathrm{g}$, in which PBHs would have completely evaporated before the start of Big Bang Nucleosynthesis (BBN) and can therefore not be directly constrained. In this case, the minimal scenario that ALPs could interact only with photons is supposed. We study the stochastic oscillations between the ALPs and photons in the cosmic magnetic field in detail. The primordial magnetic field (PMF) can be modelled as the stochastic background field model with the completely non-homogeneous component of the cosmic plasma. Using the latest stringent limits on PMF, we show the numerical results of ALP-photon oscillation probability distributions with the homogeneous and stochastic magnetic field scenarios. The PBH-induced stochastic ALP-photon oscillations in the PMF may have the effects on some further phenomena, such as the cosmic microwave background (CMB), the cosmic X-ray background (CXB), and the extragalactic gamma-ray background (EGB).

    ↳ astro-ph.COastro-ph.HEhep-phJCAP(2022)·9 citations
20. 20*

    Six-loop anomalous dimension of the ${\varphi }^Q$ operator in the $O(N)$ symmetric model

    Alexander Bednyakov🇷🇺 · Andrey Pikelner🇷🇺

    A technique of large-charge expansion provides a novel opportunity for calculation of critical dimensions of operators ${\varphi }^Q$ with fixed charge $Q$. In the small-coupling regime the polynomial structure of the anomalous dimensions can be fixed from a number of direct perturbative calculations for a fixed $Q$. At the six-loop level one needs to include new diagrams that correspond to operators with five or more legs. The latter never appeared before in scalar-theory calculations. Here we show how to compute the anomalous dimension of the operator ${\varphi }^{Q=5}$ at the six-loop order. In combination with results for operators with $Q<5$, which are extracted from the six-loop beta-functions for general scalar theory, and with predictions from the large-charge expansion, our calculation allows us to derive the answer for general-$Q$ anomalous dimensions. At the critical point resummation in three dimensions enables us to compare the critical exponents with results of Monte-Carlo simulations and large-$N$ predictions.

    ↳ hep-thcond-mat.stat-mechhep-phPRD(2022)·13 citations
21. 21*

    Thermal fluctuations on the freeze-out surface of heavy-ion collisions and their impact on particle correlations

    Adrian Skasberg Aasen🇩🇪 · Stefan Floerchinger🇩🇪 · Giuliano Giacalone🇩🇪 · Deniz Guenduez🇩🇪

    Particle momentum distributions originating from a quark-gluon plasma as produced in high-energy nuclear collisions can be influenced by thermal fluctuations in fluid dynamic fields. We study this effect by generalizing the commonly used kinetic freeze-out prescription by allowing for small fluctuations around an average in fluid velocity, chemical potentials and temperature. This leads to the appearance of specific two-body momentum correlations. Combining a blast-wave parametrization of the kinetic freeze-out surface with the thermal correlation functions of an ideal resonance gas, we perform an exploratory study of angular net-charge correlations induced by thermal fluctuations around vanishing chemical potential. We note a diffusion of the near-side peak around $\Delta y=\Delta \varphi =0$ induced by variances of different chemical potentials, which could be investigated experimentally.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·4 citations
22. 22*

    Instantons in rotating finite-temperature Yang-Mills gas

    M. N. Chernodub🇫🇷

    We find an instanton (caloron) solution in the finite-temperature SU(2) gluon gas subjected to (imaginary, in Euclidean spacetime) rotation. We demonstrate that the rotation decreases the temperature of the caloron and leads to the delocalization of its topological charge over fractionally charged constituents. Furthermore, we show that in the high-temperature limit, the rapidly-rotating caloron becomes a ``circulon'': a self-dual monopole (dyon) possessing a spatial toroidal core.

    ↳ hep-thhep-ph12 citations
23. 23*

    Thermal Contributions to Primordial Nucleosynthesis

    Samina Masood🇺🇸 · Jaskeerat Singh🇺🇸

    Electron mass is known to modify at finite temperatures and densities. Weak nuclear processes have a great impact on electron mass which modifies in a statistical background. We demonstrate how the temperature change in electron mass is associated with beta decay in the early universe. Its precise contributions to the abundance of light elements in the early universe describe some of the details about nucleosynthesis. We employ the calculational scheme of the renormalization of QED to precisely compute the temperature dependence of electron mass during the nuclear processes. In this paper we precisely compute the concentration of electron and its mass change with temperature during nucleosynthesis and use it to describe the helium abundance, expansion rate and energy density of the universe during nucleosynthesis.

    ↳ astro-ph.HEhep-phnucl-thInt.J.Mod.Phys.A(2025)·0 citations
24. 24*

    Flavored anisotropic black holes

    Ana Garbayo🇪🇸 · Carlos Hoyos🇪🇸 · Niko Jokela🇫🇮 · José Manuel Penín🇫🇮 · Alfonso V. Ramallo🇪🇸

    We construct a black hole geometry dual to a (2+1)-dimensional defect in an ambient (3+1)-dimensional gauge theory at non-zero temperature and quark density. The geometry is a solution to the equations of motion of type IIB supergravity with brane sources, a low energy limit of an intersection of stacks of color D3-branes and flavor D5-branes. We consider the case in which the number of D5-branes is large and they can be homogeneously distributed along the directions orthogonal to the defect, creating in this way a multilayer structure. The quark density is generated by exciting a gauge field in the worldvolume of the dynamic brane sources. We study the thermodynamics of the anisotropic black hole and compute the energy density of the dual theory, as well as the pressures and speeds of sound along the directions parallel and orthogonal to the defect. We also calculate transport coefficients in the shear channel, quark-antiquark potentials, and the entanglement entropies for slab subregions. These analyses give us a good overview on how the degrees of freedom are spread, entangled, and behave in this unquenched system in the deconfining phase at strong coupling.

    ↳ hep-thgr-qchep-phJHEP(2022)·9 citations
25. 25*

    A change of origin and an update to SIS100 simulation geometries

    E. Clerkin · P. Dahm

    An update on decisions made during 2021 in relation to the simulation geometries for the future CBM experiment at FAIR.

    ↳ physics.ins-dethep-exhep-phCBM Progress Report 2021·4 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.