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Nuclear Theory·nucl-th

Thursday·April 4, 2024

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 05

    [Submitted on 2 Apr 2024] (cross-list from hep-ph)

    Avenues for a number density interpretation of dihadron fragmentation functions

    T. Rogers🇺🇸 · A. Courtoy🇲🇽

    In this comment, we reassess the underlying physics of the number sum rule for dihadron fragmentation functions. We will argue that, currently, there are no settled constraints on what constitutes a valid number density interpretation for multihadron fragmentation functions. Imposing overly restrictive criteria might lead to misinterpretating the data. Most importantly, and on the basis of phenomenological analyses, the slightly varying definitions used in previous work are not excluded from possessing legitimate number density interpretations (up to the usual issues with ultraviolet divergences and renormalization), so long as they are paired with appropriate factorization theorems. We advocate for further theoretical analyses to be challenged with experimental data, available at JLab or at the future EIC.

    Comments:
    Comment, 3 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2404.02281 [pdf]
    Rev.Mex.Fis.(2025)·2 citations
  2. 06

    [Submitted on 3 Apr 2024] (cross-list from hep-ph)

    Net proton number cumulants from viscous hydro with equation of state including a critical end point

    Yi-fan Shen🇨🇳 · Wei Chen🇨🇳 · Xiang-yu Wu🇨🇦 · Kun Xu🇨🇳 · Mei Huang🇨🇳

    In the SMASH-CLVisc-hybrid framework, including SMASH for the initial conditions and the hadronic rescattering stage, and CLVisc for the quark gluon plasma (QGP) evolution, we investigate net baryon number fluctuations via considering the equation of state (EoS) with and without a critical end point (CEP) in the QCD phase transition. Specifically, two distinct QCD EoS are utilized: one with smooth crossover derived from NEOS and another with a critical end point sourced from the rPNJL model. Our results show that non-monotonic behavior of is not observed above the collision energy , nor are there explicit differences between the EoS characterized by crossover and that by CEP. This could be attributed to the significant deviation of the freeze-out line from the location of CEP. It is also found that the pure SMASH result of is positive and close to zero at 3 GeV, which is different from the negative value observed from STAR.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2404.02397 [pdf]
    PRC(2025)·3 citations
  3. 07

    [Submitted on 3 Apr 2024] (cross-list from cond-mat.quant-gas)

    Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions

    Kazuki Oi · Pascal Naidon · Shimpei Endo

    We study three-body systems in a mass-imbalanced two-component cold-atom mixture, and we investigate the three-body parameter of their Efimov states for both bosonic and fermionic systems, with a major focus on the Er-Er-Li Efimov states. For a system interacting solely via van der Waals interactions, the van der Waals universality of the three-body parameter is analytically derived using the quantum defect theory. With the addition of a perturbative dipole interaction between the heavy atoms, the three-body parameters of the bosonic and fermionic Efimov states are found to behave differently. When the dipole interaction is as strong as the van der Waals interaction, corresponding to realistic Er-Er-Li Efimov states, we show that the van der Waals universality persists once the effects of the non-perturbative dipole interaction are renormalized into the s-wave and p-wave scattering parameters between the heavy atoms. For a dipole interaction much stronger than the van der Waals interaction, we find that the universality of the Efimov states can be alternatively characterized by a quasi-one-dimensional scattering parameter due to a strong anisotropic deformation of the Efimov wavefunctions. Our work thus clarifies the interplay of isotropic and anisotropic forces in the universality of the Efimov states. Based on the renormalized van der Waals universality, the three-body parameter is estimated for specific isotopes of Er-Li cold-atom mixtures.

    Comments:
    21pages, 13 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2404.02441 [pdf]
    PRA(2024)·6 citations
  4. 08

    [Submitted on 3 Apr 2024] (cross-list from hep-ph)

    Deep learning for flow observables in high energy heavy-ion collisions

    H. Hirvonen🇫🇮 · K.J. Eskola🇫🇮 · H. Niemi🇫🇮

    We demonstrate how deep convolutional neural networks can be trained to predict 2+1 D hydrodynamic simulation results for flow coefficients, mean-transverse-momentum and charged particle multiplicity from the initial energy density profile. We show that this method provides results that are accurate enough, so that one can use neural networks to reliably estimate multi-particle flow correlators. Additionally, we train networks that can take any model parameter as an additional input and demonstrate with a few examples that the accuracy remains good. The usage of neural networks can reduce the computation time needed in performing Bayesian analyses with multi-particle flow correlators by many orders of magnitude.

    Comments:
    4 pages, 4 figures. Presented at the XXXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2023), Houston, Texas, USA
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2404.02602 [pdf]
    EPJ Web Conf.(2024)·3 citations
  5. 09

    [Submitted on 3 Apr 2024] (cross-list from hep-ph)

    Light-quark mass dependence of the resonance

    Xiu-Lei Ren🇩🇪

    We present the light-quark mass dependence of the resonance at leading order in a renormalizable framework of covariant chiral effective field theory. The meson-baryon scattering amplitudes, which are obtained by solving the scattering equation within time-ordered perturbation theory, follow the quark mass trajectory of the Coordinated Lattice Simulations consortium. At MeV and MeV, our parameter-free prediction of poles is consistent with the recent lattice results of BaSc Collaboration [Phys. Rev. Lett. 132, 051901 (2024)]. Varying the pion mass from MeV to MeV, we present the evolution of double-pole positions of : the higher pole remains a resonance around the threshold; whereas the lower pole undergoes a transition from resonance to a virtual state, and ultimately to a bound state of the system, which could be verified by the forthcoming lattice QCD simulations.

    Comments:
    9 pages, 4 figures, 1 table; version to appear in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2404.02720 [pdf]
    PLB(2024)·11 citations
  6. 10

    [Submitted on 3 Apr 2024] (cross-list from hep-ph)

    Pre-equilibrium Photon and Dilepton Production

    Oscar Garcia-Montero🇩🇪 · Aleksas Mazeliauskas🇩🇪 · Philip Plaschke🇩🇪 · Sören Schlichting🇩🇪

    We use QCD kinetic theory to compute photon and dilepton production in the chemically equilibrating out-of-equilibrium quark-gluon plasma created in the early stages of high-energy heavy-ion collisions. We derive universal scaling functions for the pre-equilibrium spectra of photons and dileptons. These scaling functions can be used to make realistic predictions for the pre-equilibrium emission and consequently establish the significance of the pre-equilibrium phase for the production of electromagnetic probes in heavy-ion collisions.

    Comments:
    4 pages, 1 figure; Proceeding on 30th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2023), 3-9 September 2023, Houston (TX), USA
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2404.02861 [pdf]
    EPJ Web Conf.(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE