Thu·Dec 28, 2023Thursday·December 28, 2023

1. 01*

   Modification of Quark-Gluon Distributions in Nuclei by Correlated Nucleon Pairs

   nCTEQ Collaboration: A.W. Denniston🇮🇱 · T. Jezo🇩🇪 · A. Kusina🇵🇱 · N. Derakhshanian🇵🇱 · P. Duwentaster🇫🇮 · O. Hen🇺🇸 · C. Keppel🇺🇸 · M. Klasen🇩🇪 · K. Kovarik🇩🇪 · J.G. Morfin🇺🇸 · K.F. Muzakka🇩🇪 · F.I. Olness🇺🇸 and 5 other authors

   We extend the QCD Parton Model analysis using a factorized nuclear structure model incorporating individual nucleons and pairs of correlated nucleons. Our analysis of high-energy data from lepton Deep-Inelastic Scattering, Drell-Yan and W/Z production simultaneously extracts the universal effective distribution of quarks and gluons inside correlated nucleon pairs, and their nucleus-specific fractions. Such successful extraction of these universal distributions marks a significant advance in our understanding of nuclear structure properties connecting nucleon- and parton-level quantities.

   hep-phnucl-exPRL(2024)·38 citations
2. 02*

   Accelerated quantum circuit Monte-Carlo simulation for heavy quark thermalization

   Xiaojian Du🇪🇸 · Wenyang Qian🇪🇸

   Thermalization of heavy quarks in the quark-gluon plasma (QGP) is one of the most promising phenomena for understanding the strong interaction. The energy loss and momentum broadening at low momentum can be well described by a stochastic process with drag and diffusion terms. Recent advances in quantum computing, in particular quantum amplitude estimation (QAE), promise to provide a quadratic speed-up in simulating stochastic processes. We introduce and formalize an accelerated quantum circuit Monte-Carlo (aQCMC) framework to simulate heavy quark thermalization. With simplified drag and diffusion coefficients connected by Einstein's relation, we simulate the thermalization of a heavy quark in isotropic and anisotropic mediums using an ideal quantum simulator and compare that to thermal expectations. With Grover-like QAE, we calculate physical observables with quadratically fewer resources, which is a boost over the classical MC simulation that usually requires a large sampling number at the same estimation accuracy.

   hep-phnucl-thquant-phPRD(2024)·15 citations
3. 03*

   Hubble Tension and Cosmological Imprints of $U(1{)}_X$ Gauge Symmetry: $U(1{)}_{B_3-3L_i}$ as a case study

   Dilip Kumar Ghosh🇮🇳 · Purusottam Ghosh🇮🇳 · Sk Jeesun🇮🇳 · Rahul Srivastava🇮🇳

   The current upper limit on $N_{\mathrm{eff}}$ at the time of CMB by Planck 2018 can place stringent constraints in the parameter space of BSM paradigms where their additional interactions may affect neutrino decoupling. Motivated by this fact in this paper we explore the consequences of light gauge boson ($Z^{\prime }$) emerging from local $U(1{)}_X$ symmetry in $N_{\mathrm{eff}}$ at the time of CMB. First, we analyze the generic $U(1{)}_X$ models with arbitrary charge assignments for the SM fermions and show that, in the context of $N_{\mathrm{eff}}$ the generic $U(1{)}_X$ gauged models can be broadly classified into two categories, depending on the charge assignments of first generation leptons. We then perform a detailed analysis with two specific $U(1{)}_X$ models: $U(1{)}_{B_3-3L_e}$ and $U(1{)}_{B_3-3L_{\mu }}$ and explore the contribution in $N_{\mathrm{eff}}$ due to the presence of $Z^{\prime }$ realized in those models. For comparison, we also showcase the constraints from low energy experiments like: Borexino, Xenon 1T, neutrino trident, etc. We show that in a specific parameter space, particularly in the low mass region of $Z^{\prime }$, the bound from $N_{\mathrm{eff}}$ (Planck 2018) is more stringent than the experimental constraints. Additionally, a part of the regions of the same parameter space may also relax the $H_0$ tension.

   hep-phEPJC(2024)·10 citations
4. 04*

   Dynamic solar Primakoff process

   Zheng-Liang Liang🇨🇳 · Lin Zhang🇨🇳

   The Primakoff mechanism is one of the primary channels for the production of solar axion. In canonical estimation of the Primakoff photon-axion conversion rate, the recoil effect is neglected and a static structure factor is adopted. By use of the linear response theory, we provide a dynamic description of the solar Primakoff process. It is found that the collective electrons overtake ions as the dominant factor, in contrast to the static screening picture where ions contribute more to the photon-axion conversion. Nonetheless, the resulting axion flux is only 1-2% lower than the standard estimate based on the static structure factor.

   hep-phPRD(2024)·4 citations
5. 05*

   Neutrino Lorentz Invariance Violation from Cosmic Fields

   Rubén Cordero🇲🇽 · Luis A. Delgadillo🇲🇽

   From a cosmological perspective, scalar fields are well-motivated dark matter and dark energy candidates. Several possibilities of neutrino couplings with a time-varying cosmic field have been investigated in the literature. In this work, we present a framework in which violations of Lorentz invariance (LIV) and $CPT$ symmetry in the neutrino sector could arise from an interaction among neutrinos with a time-varying scalar field. Furthermore, some cosmological and phenomenological aspects and constraints concerning this type of interaction are discussed. Potential violations of Lorentz and $CPT$ symmetries at present and future neutrino oscillation experiments such as IceCube and KM3NeT can probe this scenario.

   hep-phPLB(2024)·6 citations
6. 06*

   The Transverse Energy-Energy Correlator at Next-to-Next-to-Next-to-Leading Logarithm

   Anjie Gao🇺🇸 · Hai Tao Li🇨🇳 · Ian Moult🇺🇸 · Hua Xing Zhu🇨🇳

   We present an operator based factorization formula for the transverse energy-energy correlator in the back-to-back (dijet) region, and uncover its remarkable perturbative simplicity and relation to transverse momentum dynamics. This simplicity enables us to achieve next-to-next-to-next-to leading logarithmic (N${}^3$LL) accuracy for a hadron collider dijet event shape for the first time. Our factorization formula applies to color singlet, $W/Z/\gamma$ + jet, and dijet production, providing a natural generalization of transverse momentum observables to one- and two-jet final states. This provides a laboratory for precision studies of QCD and transverse momentum dynamics at hadron colliders, as well as an opportunity for understanding factorization and its violation in a perturbatively well controlled setting.

   hep-phnucl-thJHEP(2024)·40 citations
7. 07*

   Dark-technicolour at low scale

   Gauhar Abbas🇮🇳 · Neelam Singh🇮🇳

   We discuss a low-scale realization of the dark-technicolour paradigm, where the dark-technicolour scale is close to the electroweak scale. This scenario provides an ultraviolet completion of the standard HVM, and predicts a dark-Higgs with mass $m_{\mathrm{DH}}=95.4$ GeV. Moreover, the grand-unification scale in this framework can be as low as $1.18\times 10^8$ GeV.

   hep-phhep-ex6 citations
8. 08*

   $S_4$ Lepton Flavor Model with 3HDM

   Yukimura Izawa🇯🇵

   We prsent a lepton flavor model with $S_4$ and $U(1{)}_{\mathrm{FN}}$ symmetry. The left-handed leptons are assigned as a triplet under the $S_4$ symmetry, the right-handed electron and muon as $S_4$ doublets, and the right-handed tauon as an $S_4$ singlet. We introduce three right-handed Majorana neutrinos that are charged under the $S_4$ symmetry and two scalar fields. Additionally, the three Higgs doublets are assigned as an $S_4$ triplet, and we analyze the scalar potential to get the conditions for the Higgs VEVs. We numerically calculate the PMNS matrix, and give strong predictions for the mixing angle $0.486<\sin {\theta }_{23}<0.603$ and the Dirac CP phase $60.12^{\circ }<|{\delta }_{CP}|<76.47^{\circ }$. Our predictions for the lightest neutrino mass $m_{light}\simeq 5.53[\mathrm{meV}]$ and the effective Majorana neutrino mass $m_{ee}\simeq 6.33[\mathrm{meV}]$ from the neutrinoless double beta decay experiments are relatively close to upper limits. Lastly, we obtain the sum of neutrino masses $m_1+m_2+m_3\simeq 66.1[\mathrm{meV}]$, and two Majorana phases ${\eta }_1$ and ${\eta }_2$.

   hep-phhep-ex4 citations
9. 09*

   Neutrino mass mechanisms from a nonstandard Higgs Lagrangian and implications for flavor hierarchies

   Suppanat Supanyo🇹🇭 · Chanon Hasuwannakit🇬🇧 · Sikarin Yoo-Kong🇹🇭 · Lunchakorn Tannukij🇹🇭

   We present an alternative framework to establish the neutrino mass scale from the Higgs mechanism in a minimalist approach, which does not introduce new scalar bosons or extend the symmetry group of the standard model (SM). A nonstandard form of the Higgs Lagrangian, constructed via the inverse problem of calculus of variations, is proposed. Only one dimensionful parameter in the TeV scale is incorporated into the SM Lagrangian. The multiplicative Lagrangian model of the Higgs field plays an essential role in explaining the vast mass difference between charged fermions and Dirac neutrinos, while the Yukawa couplings for these two groups of particles naturally fall within the same scale. On the other hand, if the neutrino mass term has both Dirac and Majorana components, the mass of the mostly right-handed neutrinos in the Type-I seesaw mechanism can range from the keV scale up to slightly below the grand unification scale without requiring extremely small Yukawa couplings outside the SM regime. Furthermore, we discuss the potential of this mechanism to explain the hierarchical structure in the Yukawa couplings between first- and third-generation particles.

   hep-phInt.J.Mod.Phys.A(2026)·3 citations
10. 10*

    Global LHC constraints on electroweak-inos with SModelS v2.3

    Mohammad Mahdi Altakach🇫🇷 · Sabine Kraml🇫🇷 · Andre Lessa🇧🇷 · Sahana Narasimha🇦🇹 · Timothée Pascal🇫🇷 · Théo Reymermier🇫🇷 · Wolfgang Waltenberger🇦🇹

    Electroweak-inos, superpartners of the electroweak gauge and Higgs bosons, play a special role in supersymmetric theories. Their intricate mixing into chargino and neutralino mass eigenstates leads to a rich phenomenology, which makes it difficult to derive generic limits from LHC data. In this paper, we present a global analysis of LHC constraints for promptly decaying electroweak-inos in the context of the minimal supersymmetric standard model, exploiting the SModelS software package. Combining up to 16 ATLAS and CMS searches for which electroweak-ino efficiency maps are available in SModelS, we study which combinations maximise the sensitivity in different regions of the parameter space, how fluctuations in the data in individual analyses influence the global likelihood, and what is the resulting exclusion power of the combination compared to the analysis-by-analysis approach.

    hep-phhep-exSciPost Phys.(2024)·18 citations
11. 11*

    Masses of magnetized pseudoscalar and vector mesons in an extended NJL model: the role of axial vector mesons

    Máximo Coppola🇦🇷 · Daniel Gomez Dumm🇦🇷 · Santiago Noguera🇪🇸 · Norberto N. Scoccola🇦🇷

    We study the mass spectrum of light pseudoscalar and vector mesons in the presence of an external uniform magnetic field $\vec{B}$, considering the effects of the mixing with the axial vector meson sector. The analysis is performed within a two-flavor NJL-like model which includes isoscalar and isovector couplings together with a flavor mixing 't Hooft-like term. The effect of the magnetic field on charged particles is taken into account by retaining the Schwinger phases carried by quark propagators, and expanding the corresponding meson fields in proper Ritus-like bases. The spin-isospin and spin-flavor decomposition of meson mass states is also analyzed. For neutral pion masses it is shown that the mixing with axial vector mesons improves previous theoretical results, leading to a monotonic decreasing behavior with $B$ that is in good qualitative agreement with LQCD calculations, both for the case of constant or $B$-dependent couplings. Regarding charged pions, it is seen that the mixing softens the enhancement of their mass with $B$. As a consequence, the energy becomes lower than the one corresponding to a pointlike pion, improving the agreement with LQCD results. The agreement is also improved for the magnetic behavior of the lowest ${\rho }^{+}$ energy state, which does not vanish for the considered range of values of $B$ -- a fact that can be relevant in connection with the occurrence of meson condensation for strong magnetic fields.

    hep-phhep-latPRD(2024)·24 citations
12. 12*

    Wigner 6j symbols with gluon lines: completing the set of 6j symbols required for color decomposition

    Stefan Keppeler🇩🇪 · Simon Plätzer🇦🇹 · Malin Sjodahl🇸🇪

    We construct a set of Wigner 6j symbols with gluon lines (adjoint representations) in closed form, expressed in terms of similar 6j symbols with quark lines (fundamental representations). Together with Wigner 6j symbols with quark lines, this gives a set of 6j symbols sufficient for treating QCD color structure for any number of external particles, in or beyond perturbation theory. This facilitates a complete treatment of QCD color structure in terms of orthogonal multiplet bases, without the need of ever explicitly constructing the corresponding bases. We thereby open up for a completely representation theory based treatment of SU(N) color structure, with the potential of significantly speeding up the color structure treatment.

    hep-phmath-phmath.MPJHEP(2024)·10 citations
13. 13*

    Convergence of Ginzburg-Landau expansions: superconductivity in the Bardeen-Cooper-Schrieffer theory and chiral symmetry breaking in the Nambu-Jona-Lasinio model

    William Gyory🇺🇸 · Naoki Yamamoto🇯🇵

    We study the convergence of the Ginzburg-Landau (GL) expansion in the context of the Bardeen-Cooper-Schrieffer (BCS) theory for superconductivity and the Nambu-Jona-Lasinio (NJL) model for chiral symmetry breaking at finite temperature $T$ and chemical potential $\mu$. We present derivations of the all-order formulas for the coefficients of the GL expansions in both systems under the mean-field approximation. We show that the convergence radii for the BCS gap $\Delta$ and dynamical quark mass $M$ are given by ${\Delta }_{\text{conv}}=\pi T$ and $M_{\text{conv}}=\sqrt{{\mu }^2+(\pi T{)}^2}$, respectively. We also discuss the implications of these results and the quantitative reliability of the GL expansion near the first-order chiral phase transition.

    ↳ hep-thcond-mat.supr-conhep-phnucl-thPTEP(2024)·1 citation
14. 14*

    Frame transformation and stable-causal hydrodynamic theory

    Sayantani Bhattacharyya🇬🇧 · Sukanya Mitra🇮🇳 · Shuvayu Roy🇮🇳

    In this work, a connection has been indicated between the different existing formulations of relativistic hydrodynamic theories, which, in order to be causal and stable, (i) either requires `non-fluid' variables apart from velocity and temperature to be promoted to new degrees of freedom, or, (ii) needs to be in a generalized hydrodynamic frame other than those given by Landau or Eckart. The BDNK stress tensor (originally in a general frame) has been rewritten in the Landau frame using linearized all-order gradient-corrected redefinitions of the temperature and velocity fields. The redefinitions indicate that, while the BDNK formalism has a finite number of derivatives in the general frame, when written in the Landau frame, it either has an infinite number of derivatives, or one has to introduce MIS-like `non-fluid' variables by summing the infinite number of derivatives in the field redefinitions. There can be non-unique ways of performing these infinite-order summations. Finally, the dispersion relations and the corresponding spectra of these different systems of MIS type equations have been analyzed to check that the systems of equations presented here are indeed equivalent to the BDNK formalism, at least in the hydrodynamic regime.

    ↳ nucl-thgr-qchep-phhep-th10 citations
15. 15*

    Probing Ultralight Tensor Dark Matter with the Stochastic Gravitational-Wave Background from Advanced LIGO and Virgo's First Three Observing Runs

    Rong-Zhen Guo🇨🇳 · Yang Jiang🇨🇳 · Qing-Guo Huang🇨🇳

    Ultralight bosons are attractive dark-matter candidates and appear in various scenarios beyond standard model. They can induce superradiant instabilities around spinning black holes (BHs), extracting the energy and angular momentum from BHs, and then dissipated through monochromatic gravitational radiation, which become promising sources of gravitational wave detectors. In this letter, we focus on massive tensor fields coupled to BHs and compute the stochastic gravitational wave backgrounds emitted by these sources. We then undertake a search for this background within the data from LIGO/Virgo O1$\sim$ O3 runs. Our analysis reveals no discernible evidence of such signals, allowing us to impose stringent limits on the mass range of tensor bosons. Specifically, we exclude the existence of tensor bosons with masses ranging from $4.0\times 10^{-14}$ to $2.0\times 10^{-12}$ eV at $95\%$ confidence level.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2024)·8 citations
16. 16*

    Novel Instabilities in Counter-Streaming Nonabelian Fluids

    Subramanya Bhat K N🇮🇳 · Amita Das🇮🇳 · V Ravishankar🇮🇳 · Bhooshan Paradkar🇮🇳

    The dynamics of strongly interacting particles are governed by Yang-Mills (Y-M) theory, which is a natural generalization of Maxwell Electrodynamics (ED). Its quantized version is known as quantum chromodynamics (QCD) and has been very well studied. Classical Y-M theory is proving to be equally interesting because of the central role it plays in describing the physics of quark-gluon plasma (QGP)-which was prevalent in the early universe and is also produced in relativistic heavy ion collision experiments. This calls for a systematic study of classical Y-M theories. A good insight into classical Y-M dynamics would be best obtained by comparing and contrasting the Y-M results with their ED counterparts. In this article, a beginning has been made by considering streaming instabilities in Y-M fluids. We find that in addition to analogues of ED instabilities, novel nonabelian modes arise, reflecting the inherent nonabelian nature of the interaction. The new modes exhibit propagation/ growth, with growth rates that can be larger than what we find in ED. Interestingly, we also find a mode that propagates without getting affected by the medium.

    ↳ physics.plasm-phhep-ph0 citations
17. 17*

    Radiative corrections to the $R$ and $R^2$ invariants from torsion fluctuations on maximally symmetric spaces

    Riccardo Martini🇮🇹 · Gregorio Paci🇮🇹 · Dario Sauro🇮🇹

    We derive the runnings of the $R$ and $R^2$ operators that stem from integrating out quantum torsion fluctuations on a maximally symmetric Euclidean background, while treating the metric as a classical field. Our analysis is performed in a manifestly covariant way, exploiting both the recently-introduced spin-parity decomposition of torsion perturbations and the heat kernel technique. The Lagrangian we start with is the most general one for 1-loop computations on maximally symmetric backgrounds involving kinetic terms and couplings to the scalar curvature that is compatible with a gauge-like symmetry for the torsion. The latter removes the twice-longitudinal vector mode from the spectrum, and it yields operators of maximum rank four. We also examine the conditions required to avoid ghost instabilities and ensure the validity of our assumption to neglect metric quantum fluctuations, demonstrating the compatibility between these two assumptions. Then, we use our findings in the context of Starobinsky's inflation to calculate the contributions from the torsion tensor to the $\beta$-function of the $R^2$ term. While this result is quantitatively reliable only at the $0$-th order in the slow-roll parameters or during the very early stages of inflation -- due to the background choice -- it qualitatively illustrates how to incorporate quantum effects of torsion in the path integral formalism.

    ↳ gr-qchep-phhep-thmath-ph+1JHEP(2024)·15 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.