Tue·Jun 20, 2023Tuesday·June 20, 2023

1. 01*

   Two-loop helicity amplitudes for $V+$jet production including axial vector couplings to higher orders in $ϵ$

   Thomas Gehrmann🇨🇭 · Petr Jakubčík🇨🇭 · Cesare Carlo Mella🇩🇪 · Nikolaos Syrrakos🇩🇪 · Lorenzo Tancredi🇩🇪

   We compute the two-loop Quantum Chromodynamics (QCD) corrections to all partonic channels relevant for the production of an electroweak boson $V=Z,W^{\pm },{\gamma }^{\ast }$ and a jet at hadron colliders. We consider the decay of a vector boson $V$ to three partons $V\to q\bar{q}g$, $V\to ggg$ with a vector and axial vector coupling in both channels, including singlet and non-singlet contributions. For the quark channel, we use a recent tensor decomposition and extend the calculation to $\mathcal{O}({ϵ}^2)$. For the gluonic channel, we define a new tensor decomposition which allows us to compute the vector and the axial vector amplitudes at once and to perform the computation of the amplitudes to $\mathcal{O}({ϵ}^2)$. We provide finite remainders of the helicity amplitudes analytically continued to all relevant scattering regions $q\bar{q}\to Vg$, $qg\to Vq$ and $gg\to Vg$. The axial vector contribution to the gluon-induced channel completes the set of two-loop amplitudes for this process, while the extension to $\mathcal{O}({ϵ}^2)$ represents the first step in the calculation of next-to-next-to-next-to-leading-order (N${}^3$LO) QCD corrections to $Z$+jet production at hadron colliders.

   hep-phJHEP(2023)·24 citations
2. 02*

   Quark mass difference effects in hadronic Fermi matrix elements from first principles

   Chien-Yeah Seng🇺🇸 · Vincenzo Cirigliano🇺🇸 · Xu Feng🇨🇳 · Mikhail Gorchtein🇩🇪 · Luchang Jin🇺🇸 · Gerald A. Miller🇺🇸

   It was recently estimated that the strong isospin-symmetry breaking (ISB) corrections to the Fermi matrix element in free neutron decay could be of the order $10^{-4}$, one order of magnitude larger than the na\"ıve estimate based on the Behrends-Sirlin-Ademollo-Gatto theorem. To investigate this claim, we derive a general expression of the leading ISB correction to hadronic Fermi matrix elements, which takes the form of a four-point correlation function in lattice gauge theory and is straightforward to compute from first principles. Our formalism paves the way for the first determination of such correction in the neutron sector with fully-controlled theory uncertainties.

   hep-phhep-exhep-latnucl-ex+1PLB(2023)·7 citations
3. 03*

   Impact of chiral asymmetry and magnetic field on passage of an energetic test parton in a QCD medium

   Ritesh Ghosh🇮🇳 · Mohammad Yousuf Jamal🇮🇳 · Manu Kurian🇺🇸

   We study the dependence of collisional energy loss of a test parton moving with a high velocity on the chiral imbalance and magnetic field in the QCD medium. A semi-classical approach is adopted to estimate the parton energy loss that takes into account the back-reaction on the parton due to the polarization effects of the QCD medium while traversing through the medium. We find that the motion of the parton is sensitive to the chiral asymmetry in the medium. Further, we investigate the effect of magnetic field-induced anisotropy on the energy transfer between the moving parton and the medium. Our results show that the energy loss of the parton is strongly influenced by the strength of the magnetic field as well as the relative orientation of the motion of the parton and the direction of the magnetic field in the medium.

   hep-phPRD(2023)·15 citations
4. 04*

   Renormalization group summation and analytic continuation from spacelike to timeline regions

   M. S. A. Alam Khan🇮🇳

   Analytic continuation of the perturbative series from spacelike to timelike regions is performed using renormalization group summed perturbation theory (RGSPT). This method provides an all-order summation of kinematic ``${\pi }^2$-terms'' accessible from a given order of a perturbative series. The impact of the summation of these terms is studied for Higgs boson decay and electromagnetic R-ratio in the perturbative QCD. Results obtained using RGSPT have improved convergence behavior in addition to significantly reduced renormalization scale dependence compared to fixed-order perturbation theory (FOPT). The higher-order behavior using the Padé approximant is also studied for processes considered.

   hep-phhep-lathep-thPRD(2023)·17 citations
5. 05*

   Renormalization group improved determination of light quark masses from Borel-Laplace sum rules

   M. S. A. Alam Khan🇮🇳

   We determine masses of light quarks ($m_u$,$m_d$,$m_s$) using Borel-Laplace sum rules and renormalization group summed perturbation theory (RGSPT) from the divergence of the axial vector current. The RGSPT significantly reduces the scale dependence of the finite order perturbative series for the renormalization group (RG) invariant quantities such as spectral function, the second derivative of the polarization function of the pseudoscalar current correlator, and its Borel transformation. In addition, the convergence of the spectral function is significantly improved by summing all running logarithms and kinematical ${\pi }^2$-terms. Using RGSPT, we find $m_s(2GeV)=104.34_{-4.21}^{+4.23}\text{hs}\text{MeV}$, and $m_d(2GeV)=4.21_{-0.45}^{+0.48}\text{hs}\text{MeV}$ leading to $m_u(2GeV)=2.00_{-0.40}^{+0.33}\text{hs}\text{MeV}$.

   hep-phhep-latPRD(2023)·9 citations
6. 06*

   Core-corona procedure and microcanonical hadronization to understand strangeness enhancement in proton-proton and heavy ion collisions in the EPOS4 framework

   K. Werner🇫🇷

   The multiplicity dependence of multistrange hadron yields in proton-proton and lead-lead collisions at several TeV allows one to study the transition from very big to very small systems, in particular, concerning collective effects. I investigate this, employing a core-corona approach based on new microcanonical hadronization procedures in the EPOS4 framework, as well as new methods allowing one to transform energy-momentum flow through freeze-out surfaces into invariant-mass elements. I try to disentangle effects due to ``canonical suppression'' and ``core-corona separation'', which will both lead to a reduction of the yields at low multiplicity.

   hep-phnucl-thPRC(2024)·72 citations
7. 07*

   Renormalization group improved determination of ${\alpha }_s$, $m_c$, and $m_b$ from the low energy moments of heavy quark current correlators

   M. S. A. Alam Khan🇮🇳

   We determine ${\alpha }_s$, $m_c$, and $m_b$ using the relativistic quarkonium sum rule and the renormalization group summed perturbation theory (RGSPT). Theoretical uncertainties, especially originating from the variation of the renormalization scale, are considerably reduced for the higher moments. Our determinations using RGSPT are also found to be stable with respect to the use of $\overline{\text{MS}}$ quark mass for the condensate terms. We obtain ${\alpha }_s^{\left(n_f=5\right)}(M_Z)=0.1171(7)$, ${\overline{m}}_c=1281.1(3.8)\mathrm{MeV}$, and ${\overline{m}}_b=4174.3(9.5)\mathrm{MeV}$.

   hep-phhep-latPRD(2023)·10 citations
8. 08*

   Helicity of Quarks and Gluons at Small Bjorken $x$

   Yossathorn Tawabutr🇺🇸

   The proton spin puzzle is a longstanding problem in high-energy nuclear physics: how the proton spin distributes among the spin and orbital angular momenta of the quarks and gluons inside. Two of the unresolved pieces of the puzzle are the contributions to quark and gluon spins from the region of small Bjorken $x$. This dissertation fills the gap by constructing the evolution of these quantities into the small-$x$ region using a modified dipole formalism. The dominant contributions to the evolution equations resum powers of ${\alpha }_s{\ln }^2(1/x)$, where ${\alpha }_s$ is the strong coupling constant. In general, these evolution equations do not close. However, once the large-$N_c$ or large-$N_c\&N_f$ limit is taken, they turn into a system of linear integral equations that can be solved iteratively. At large $N_c$, the evolution equations are shown to be consistent with the gluon sector of the polarized DGLAP evolution in the small-$x$ limit. We numerically solve the equations in the large-$N_c$ and large-$N_c\&N_f$ limits and obtain the exponential growth in $\ln (1/x)$ for $N_f\le 5$, with the intercept decreasing with $N_f$. For the large-$N_c$ limit, we have ${\alpha }_h=3.66$, which agrees up to the uncertainty with the earlier work by Bartels, Ermolaev and Ryskin. Furthermore, at $N_f=6$, the asymptotic form attains an oscillation in $\ln (1/x)$ on top of the exponential growth, with the period spanning several units of rapidity. Finally, parts of the single-logarithmic corrections to the small-$x$ helicity evolution is also derived, resumming powers of ${\alpha }_s\ln (1/x)$. There, the effects of the unpolarized small-$x$ evolution and the running coupling are also included for consistency. The complete single-logarithmic corrections can be derived based on the framework established here. Altogether, these equations will provide the most precise small-$x$ helicity evolution to date.

   hep-phhep-exnucl-exnucl-th4 citations
9. 09*

   An updated determination of the pion-photon transition form factor

   Hua Zhou🇨🇳 · Jiang Yan🇨🇳 · Qing Yu🇨🇳 · Xing-Gang Wu🇨🇳

   In this paper, we study the properties of the pion-photon transition form factor (TFF), $\gamma {\gamma }^{\ast }\to {\pi }^0$, by using the principle of maximum commonality (PMC) to deal with its perturbative QCD contribution up to next-to-next-to-leading order (NNLO) QCD corrections. Applying the PMC, we achieve precise pQCD approximant for the TFF in large $Q^2$-region without conventional renormalization scale ambiguity. We also discuss the power suppressed non-valence quark contribution to the TFF, which is important for a sound prediction in low and intermediate $Q^2$-region, e.g. the non-valence quark components affect the TFF by about $1\%$ to $23\%$ when $Q^2$ changes down from $40\mathrm{Ge}{\mathrm{V}}^2$ to $4\mathrm{Ge}{\mathrm{V}}^2$. The resultant pion-photon TFF shows a better agreement with previous Belle data. It is hoped that previous discrepancies between the experimental measurements and theoretical predictions could be clarified by the forth-coming precise data on the Belle II measurements.

   hep-phPRD(2023)·8 citations
10. 10*

    Search for Lepton Flavor Violating Signals at the Future Electron-Proton Colliders

    Anjan Kumar Barik🇮🇳 · Atri Dey🇮🇪 · Tousik Samui🇮🇳

    The search for lepton flavor violation (LFV) is a powerful probe to look for new physics beyond the Standard Model. We explored the possibility of searches for LFV $Z$ boson couplings to electron and muon pairs at the upcoming electron-proton colliders, namely the Large Hadron Electron Collider (LHeC) and the Future Circular lepton-hadron Collider (FCC-eh). We employed the study via a single muon plus an associated jet channel to search for the LFV signal. We used a multivariate technique to obtain an improved signal-background analysis. By using the condition on nonobservation of any significant deviation of the signal over the expected background, we provide an upper limit on the LFV $Z$ boson coupling and corresponding branching ratio (BR). We find that an upper limit of up to $1.13\times 10^{-7}$ and $4.64\times 10^{-8}$ can be set on BR($Z\to e\mu$) at 95\% confidence level (C.L.) with one year run of LHeC and FCC-eh, respectively, if the LFV coupling is governed by vector or axial-vector coupling. For tensor or axial-tensor coupling, these limits can be improved up to $2.34\times 10^{-8}$ and $5.02\times 10^{-9}$ for LHeC and FCC-eh machines, respectively, at 95\% C.L. The projected numbers improve significantly over the existing limit of $2.62\times 10^{-7}$ set by ATLAS.

    hep-phhep-exPLB(2026)·3 citations
11. 11*

    Effect of finite volume on thermodynamics of quark-hadron matter

    Somenath Pal🇮🇳 · Anton Motornenko🇩🇪 · Volodymyr Vovchenko🇺🇸 · Abhijit Bhattacharyya🇮🇳 · Jan Steinheimer🇩🇪 · Horst Stoecker🇩🇪

    The effects of a finite system volume on thermodynamic quantities, such as the pressure, energy density, specific heat, speed of sound, conserved charge susceptibilities and correlations, in hot and dense strongly interacting matter are studied within the parity-doublet Chiral Mean Field (CMF) model. Such an investigation is motivated by relativistic heavy-ion collisions, which create a blob of hot QCD matter of a finite volume, consisting of strongly interacting hadrons and potentially deconfined quarks and gluons. The effect of the finite volume of the system is incorporated by introducing a lower momentum cut-offs in the momentum integrals appearing in the model, the numerical value of the momentum cut-off being related to the de Broglie wavelength of the given particle species. It is found that some of these quantities show a significant volume dependence, in particular those sensitive to pion degrees of freedom, and the crossover transition is generally observed to become smoother in finite volume. These findings are relevant for the effective equation of state used in fluid dynamical simulations of heavy-ion collisions and efforts to extract the freeze out properties of heavy-ion collisions with susceptibilities involving electric charge and strangeness.

    hep-phnucl-thPRD(2024)·8 citations
12. 12*

    Exclusive ${\eta }_c$ production from small-$x$ evolved Odderon at a electron-ion collider

    Sanjin Benić🇭🇷 · Davor Horvatić🇭🇷 · Abhiram Kaushik🇭🇷 · Eric Andreas Vivoda🇭🇷

    We compute exclusive ${\eta }_c$ production in high energy electron-nucleon and electron-nucleus collisions that is sensitive to the Odderon. In perturbative QCD the Odderon is a $C$-odd color singlet consisting of at least three $t$-channel gluons exchanged with the target. By using the Color Glass Condensate effective theory our result describes the Odderon exchange at the high collision energies that would be reached at a future electron-ion collider. The Odderon distribution is evolved to small-$x$ using the Balitsky-Kovchegov evolution equation with running coupling corrections. We find that while at low momentum transfers $t$ the cross section off a proton is dominated by the Primakoff process, the Odderon becomes relevant at larger momentum transfers of $|t|\ge 1.5$ GeV${}^2$. We point that the Odderon could also be extracted at low-$t$ using neutron targets since the Primakoff component is strongly suppressed. In the case of nuclear targets, the Odderon cross section becomes enhanced thanks to the mass number of the nuclear target. The gluon saturation effect induces a shift in the diffractive pattern with respect to the Primakoff process that could be used as a signal for the Odderon.

    hep-phnucl-thPRD(2023)·18 citations
13. 13*

    Neutrino mixing matrix in terms of neutrino mass matrix and its Frobenius covariants

    M.I. Krivoruchenko🇷🇺 · F. Šimkovic🇸🇰

    An explicit expression is derived for the mixing matrix of Majorana neutrinos in terms of the mass matrix and its Frobenius covariants. Illustrative scenarios are taken as examples where the suggested formula is used to obtain the mixing matrix from the mass matrix.

    hep-phPhys.Part.Nucl.Lett.(2024)·3 citations
14. 14*

    Two and three photon fusion into charmonium in ultra-peripheral nuclear collisions

    R. Fariello🇧🇷 · D. Bhandari🇺🇸 · C.A. Bertulani🇺🇸 · F.S. Navarra🇧🇷

    In this paper we investigate the production of charmonium states in two and three photon fusion processes in nucleus -- nucleus collisions at the CERN Large Hadron Collider (LHC) energies. Our results indicate that the experimental study of these processes is feasible and can be used to constrain the theoretical decay widths and give information on the non $c-\bar{c}$ components of these states.

    hep-phnucl-thPRC(2023)·12 citations
15. 15*

    Amplitude of $H\to \gamma Z$ process via one $W$ loop in unitary gauge (I. Details of calculation with Dyson scheme)

    Shi-Yuan Li🇨🇳

    Decay amplitude of $H\to \gamma Z$ process via one $W$ loop in the unitary gauge is presented. The divergent integrals including those of high divergence orders typical of unitary gauge are arranged to cancel to get the electromagnetic $U(1)$ gauge invariant finite result, hence no contribution to the renormalization constant of $Z\gamma$ mixing in this 1-loop subprocess. For the calculation of the Feynman diagrams employing the Feynman rules, all the integrations of the propagator momenta and all the delta-functions representing the 4-momentum conservation of every vertex are retained in the beginning. Therefore, the ambiguity of setting independent loop momentum for divergences worse than logarithmic does not exist, and shift of integrated variable in such divergent integrals is eschewed. The calculation are done in 4-dimension Minkowski momentum space without the aid of any regularization. The correct treatment on the surface terms for the quadratic and logarithmic tensor integral is one of the key points. This part I is devoted to the calculation details and the indications from the key surface terms. Comparing with other gauge(s) and complete results for $H\to \gamma Z$ are left for part II.

    hep-ph1 citation
16. 16*

    Multi-frequency probes of 2HDM+S dark matter

    Geoff Beck🇿🇦

    The two-Higgs-doublet with additional scalar (2HDM$+S$) model is one proposed to account for several anomalies that have persisted and increased in significance over runs 1 and 2 at the Large Hadron Collider (LHC). In addition to this, 2HDM+$S$ also supplies a potential Dark Matter (DM) candidate coupling to the Standard Model via the $S$ boson. So far, this model has been difficult to constrain by indirect means. Here we will explore the potential of Omega Centauri, a nearby globular cluster to constrain this interesting DM model. Although such structures are generally considered to be lacking in DM, arguments have been made that this cluster is in fact the relic of a tidally stripped dwarf galaxy. In such a scenario, the DM content would be significant. Combined with its nearness, this would suggest a potential for powerful indirect dark matter signals. We employ both Fermi-LAT gamma-ray data, as well as MeerKAT telescope sensitivities to determine the current status of Omega Centauri as a source of indirect constraints on Weakly Interacting Massive Particles (WIMPs) in a 2HDM+$S$ scenario and for general annihilation channels.

    hep-phastro-ph.COPoS(2023)·1 citation
17. 17*

    Gravitational wave probes on self-interacting dark matter surrounding an intermediate mass black hole

    Kenji Kadota🇨🇳 · Jeong Han Kim🇰🇷 · Pyungwon Ko🇰🇷 · Xing-Yu Yang🇰🇷

    The presence of dark matter overdensities surrounding a black hole can influence the evolution of a binary system. The gravitational wave signals emitted by a black hole binary offer a promising means to probe the dark matter environments near a black hole. The dense region of dark matter can lead to the dephasing of gravitational waveforms, which can be detected by upcoming experiments such as the Laser Interferometer Space Antenna (LISA). The dark matter density profile around the black hole can vary for different dark matter models. Our study specifically investigates the impact of the ultralight self-interacting scalar dark matter (SIDM) on the gravitational wave signals emitted by black hole binaries. A distinctive characteristic of SIDM surrounding a black hole, as opposed to collisionless dark matter, is the formation of a soliton core. We perform a Fisher matrix analysis to estimate the size of the soliton and the corresponding SIDM parameter space that future LISA-like gravitational wave experiments can explore.

    hep-phastro-ph.COgr-qchep-thPRD(2024)·30 citations
18. 18*

    Challenging Beyond-the-Standard-Model Solutions to the Fine-Structure Anomaly in Heavy Muonic Atoms

    K. A. Beyer🇩🇪 · I. A. Valuev🇩🇪 · C. H. Keitel🇩🇪 · M. Tamburini🇩🇪 · N. S. Oreshkina🇩🇪

    The leading-order contribution of a new boson to the muonic fine-structure anomaly, which refers to a discrepancy between the predicted transition energies and spectroscopic measurements of $\mu {-}^{90}$Zr, $\mu {-}^{120}$Sn, and $\mu {-}^{208}$Pb, is investigated. We consider bosons of scalar, vector, pseudoscalar, and pseudovector type. Spin-dependent couplings sourced by pseudoscalars or pseudovectors are disfavoured as solutions to the anomaly due to the nuclei in question having vanishing angular momentum. Spin-independent interactions resulting from scalar or vector exchange are also disfavoured because no parameter space exists to simultaneously fit different atomic states of the same nucleus. Therefore, we conclude that a `Beyond-the-Standard-Model' resolution of the muonic fine-structure anomaly is generally disfavoured, and the first-order solution by a single new boson is excluded.

    hep-phphysics.atom-phPLB(2024)·8 citations
19. 19*

    Dilaton-induced open quantum dynamics

    Christian Käding🇦🇹 · Mario Pitschmann🇦🇹 · Caroline Voith🇦🇹

    In modern cosmology, scalar fields with screening mechanisms are often used as explanations for phenomena like dark energy or dark matter. Amongst a zoo of models, the environment dependent dilaton, screened by the Polyakov-Damour mechanism, is one of the least constrained ones. Using recently developed path integral tools for directly computing reduced density matrices, we study the open quantum dynamics of a probe, modelled by another real scalar field, induced by interactions with an environment comprising fluctuations of a dilaton. As the leading effect, we extract a correction to the probe's unitary evolution, which can be observed as a frequency shift. Assuming the scalar probe to roughly approximate a cold atom in matter wave interferometry, we show that comparing the predicted frequency shifts in two experimentally distinct setups has the potential to exclude large parts of the dilaton parameter space.

    hep-phastro-ph.COgr-qchep-th+1EPJC(2023)·31 citations
20. 20*

    GUT origins of general electroweak multiplets and their oblique parameters

    Liang Chen🇨🇳 · Ta-Wei Chan🇹🇼 · Thomas W. Kephart🇺🇸 · Wai Yee Keung🇺🇸 · Tzu-Chiang Yuan🇹🇼

    We survey the scalar electroweak multiplets that can originate from a grand unified theory (GUT) like $SU(5)$, $SO(10)$ or $E_6$. We compute the oblique parameters $S$, $T$ and $U$ for a general scalar electroweak multiplet and then apply the results to the leptoquark, as well as the color sextet and octet cases, allowed by the GUT survey. Constraints from precision measurement data of the Standard Model $W$ boson mass and $\rho$ parameter to the mass splittings within each of these multiplets are presented. Extension to general vector electroweak multiplets is briefly discussed.

    hep-phNPB(2024)·0 citations
21. 21*

    $J/\psi$ production at NLO with a scale-dependent color-evaporation model

    B. Guiot🇨🇱 · A. Radic🇨🇱 · I. Schmidt🇨🇱 · K. Werner🇫🇷

    Nearly ten years ago, Kang, Ma, Qiu, and Sterman derived an evolution equation for a $Q\bar{Q}$ pair fragmenting into a quarkonium. In this study we explore the consequence of this evolution for the color-evaporation model, focusing on $J/\psi$ transverse-momentum ($p_t$) distributions in proton-proton collisions. We show that, as expected, it softens the spectrum obtained by fixed-order calculations. While next-to-leading-order calculations strongly overestimate data at large $p_t$, ours, including the (approximate) $Q\bar{Q}$ evolution and next-to-leading-order cross sections computed with Madgraph, are in good agreement with experiments. Since our study with the color-evaporation model shows a significant effect of the $Q\bar{Q}$ evolution at large $p_t$, a determination of scale-dependent long-distance-matrix elements of non-relativistic QCD could be necessary. To describe data at small and intermediate $p_t$, we use the $k_t$-factorization approach, and we argue that quarkonia data could help constrain unintegrated parton densities.

    hep-phPRD(2023)·4 citations
22. 22*

    Distinctive nuclear signatures of low-energy atmospheric neutrinos

    Anna M. Suliga🇺🇸 · John F. Beacom🇺🇸

    New probes of neutrino mixing are needed to advance precision studies. One promising direction is via the detection of low-energy atmospheric neutrinos (below a few hundred MeV), to which a variety of near-term experiments will have much-improved sensitivity. Here we focus on probing these neutrinos through distinctive nuclear signatures of exclusive neutrino-carbon interactions -- those that lead to detectable nuclear-decay signals with low backgrounds -- in both neutral-current and charged-current channels. The neutral-current signature is a line at 15.11 MeV and the charged-current signatures are two- or three-fold coincidences with delayed decays. We calculate the prospects for identifying such events in the Jiangmen Underground Neutrino Observatory (JUNO), a large-scale liquid-scintillator detector. A five-year exposure would yield about 16 neutral-current events (all flavors) and about 16 charged-current events (mostly from ${\nu }_e+{\bar{\nu }}_e$, with some from ${\nu }_{\mu }+{\bar{\nu }}_{\mu }$), and thus roughly 25\% uncertainties on each of their rates. Our results show the potential of JUNO to make the first identified measurement of sub-100 MeV atmospheric neutrinos. They also are a step towards multi-detector studies of low-energy atmospheric neutrinos, with the goal of identifying additional distinctive nuclear signatures for carbon and other targets.

    hep-phastro-ph.HEnucl-thPRD(2023)·10 citations
23. 23*

    Vector-Like Top Quark Production via an Electroweak Dipole Moment at a Muon Collider

    Alexander Belyaev🇬🇧 · R. Sekhar Chivukula🇺🇸 · Benjamin Fuks🇫🇷 · Elizabeth H. Simmons🇺🇸 · Xing Wang🇺🇸

    Vectorial partners of the Standard Model quarks and leptons are predicted in many dynamical models of electroweak symmetry breaking. The most easily accessible of these new particles, either due to mass or couplings, are typically expected to be the partners of the third-generation fermions. It is therefore essential to explore the signatures of these particles at future high-energy colliders. We study the potential of a high-energy muon collider to singly produce a vector-like top-quark partner via an electroweak dipole moment operator, such an operator being typical of composite constructions beyond the Standard Model. We use a phenomenological model for third-generation quarks and their partners that satisfies an extended custodial symmetry. This automatically protects the $W$-boson and $Z$-boson masses from receiving large electroweak corrections, and it allows the model to be viable given current electroweak data. We demonstrate that cross sections associated with dipole-induced vector-like quark production can easily exceed those inherent to more conventional single-production modes via ordinary electroweak couplings. We then explore the associated phenomenology, and we show that at least one (and often more than one) of the extra vector-like states can be studied at high-energy muon colliders. Typical accessible masses are found to range up to close to the kinematic production threshold, when the vector-like partners are produced in combination with an ordinary top quark.

    hep-phhep-exPRD(2023)·15 citations
24. 24*

    Skyrmions at Finite Density

    Fabrizio Canfora🇨🇱 · Scarlett C. Rebolledo-Caceres🇨🇱

    In this paper, we will describe recent advances in analytical methods to construct exact solutions of the Skyrme model (and its generalizations) representing inhomogeneous Hadronic condensates living at finite Baryon density. Such novel analytical tools are based on the idea to generalize the well known spherical hedgehog ansatz to situations (relevant for the analysis of finite density effects) in which there is no spherical symmetry anymore. Besides the intrinsic mathematical interest to find exact solutions with non-vanishing Baryonic charge confined to a finite volume, this framework opens the possibility to compute important physical quantities which would be difficult to compute otherwise.

    ↳ hep-thhep-phnucl-thMod.Phys.Lett.A(2023)·4 citations
25. 25*

    Polarized Photons from the Early Stages of Relativistic Heavy-Ion Collisions

    Sigtryggur Hauksson🇫🇷 · Charles Gale🇨🇦

    The polarization of real photons emitted from early-time heavy-ion collisions is calculated, concentrating on the contribution from bremsstrahlung and quark-antiquark annihilation processes at leading order in the strong coupling. The effect of an initial momentum space anisotropy of the parton distribution is evaluated using a model for the non-equilibrium scattering kernel for momentum broadening. The effect on the photon polarization is reported for different degrees of anisotropy. The real photons emitted early during in-medium interactions will be dominantly polarized along the beam axis.

    ↳ nucl-thhep-phPRC(2024)·13 citations
26. 26*

    Dynamical Analysis of the Dirac-Born-Infeld type of Tachyon field minimally coupled with barotropic fluid using EOS parametrization of a field

    Saddam Hussain🇮🇳 · Saikat Chakraborty🇹🇭 · Nandan Roy🇹🇭 · Kaushik Bhattacharya🇮🇳

    In this paper, we present a dynamical system analysis of the tachyon dark energy model by parametrization of the equation of state (EoS) of the dark energy. The choice of parametrization can constrain the form of the field potential, and as a result, the theory can be directly constrained from the observation without assuming a particular form of the potential.

    ↳ gr-qchep-phSpringer Proc.Phys.(2024)·0 citations
27. 27*

    Reduce, Reuse, Reinterpret: an end-to-end pipeline for recycling particle physics results

    Giordon Stark🇺🇸 · Camila Aristimuno Ots🇺🇸 · Mike Hance🇺🇸

    Searches for new physics at the Large Hadron Collider have constrained many models of physics beyond the Standard Model. Many searches also provide resources that allow them to be reinterpreted in the context of other models. We describe a reinterpretation pipeline that examines previously untested models of new physics using supplementary information from ATLAS Supersymmetry (SUSY) searches in a way that provides accurate constraints even for models that differ meaningfully from the benchmark models of the original analysis. The public analysis information, such as public analysis routines and serialized probability models, is combined with common event generation and simulation toolkits MadGraph, Pythia8, and Delphes into workflows steered by TOML configuration files, and bundled into the mapyde python package. The use of mapyde is demonstrated by constraining previously untested SUSY models with compressed sleptons and electroweakinos using ATLAS results.

    ↳ hep-exhep-phPhys. Codebases 2024·4 citations
28. 28*

    Chiral symmetry breaking and phase diagram of dual chiral density wave in a rotating quark matter

    S. M. A. Tabatabaee🇮🇷

    We study the inhomogeneous phase of a two-flavor quark matter under rotation at finite temperature and density using the Nambu-Jona-Lasinio model. To do this, we consider the chiral broken phase, in particular, described by the so-called dual chiral density wave which is formed as a standing wave of simultaneous scalar and pseudoscalar condensates. The solution of the corresponding Dirac equation as well as the energy spectrum found in the mean-field approximation. We then use the thermodynamic potential calculated for this model, to study the $\mu$ and $\Omega$ dependence of constituent mass and the wave vector at $T=0$. We find there exist two islands in the $\mu -\Omega$ plane that the dual-chiral density wave survives. The first region lies at intermediate densities and small $\Omega$. We observe, by increasing the angular velocity of matter, dual-chiral density wave forms in regions with smaller chemical potential. On the other hand, in contrast to the former, the second region is located at the large $\Omega$ and small densities. Finally, we study this phase of quark matter at finite temperature and present $T-\mu$, $T-\Omega$, and $\mu -\Omega$ phase portraits of a hot-rotating quark matter at finite density.

    ↳ nucl-thhep-phPRD(2023)·13 citations

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