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Nuclear Theory·nucl-th

Friday·January 19, 2024

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 01

    Hadronisation in event generators from small to large systems

    Yuuka Kanakubo🇫🇮 · Yasuki Tachibana🇯🇵 · Tetsufumi Hirano🇯🇵

    The results of the dynamical core-corona initialisation framework in p+p and Pb+Pb collisions at the LHC energies are presented. We extract the fractions of final hadron yields originating from equilibrated and non-equilibrated matter as functions of multiplicity. We show that the contribution from non-equilibrated matter is non-negligible even in intermediate and central Pb+Pb collisions. The particle production from non-equilibrated matter behaves as a correction on that is purely obtained from the equilibrated matter. The result poses a warning on Bayesian parameter estimation with conventional hydrodynamic models. The observed flow coefficients might need a reinterpretation with new dynamical models which incorporate the particle production from non-equilibrated matter.

    nucl-thhep-phnucl-exPoS(2024)·0 citations
  2. 02

    Impact of Limited Statistics on the Measured Hyper-Order Cumulants of Net-Proton Distributions in Heavy-Ion Collisions

    Lizhu Chen🇨🇳 · Ye-Yin Zhao🇨🇳 · Yunshan Cheng🇺🇸 · Gang Wang🇺🇸 · Zhiming Li🇨🇳 · Yuanfang Wu🇨🇳

    Hyper-order cumulants and of net-baryon distributions are anticipated to offer crucial insights into the phase transition from quark-gluon plasma to hadronic matter in heavy-ion collisions. However, the accuracy of and is highly contingent on the fine shape of the distribution's tail, the detectable range of which could be essentially truncated by low statistics. In this paper, we use the fast Skellam-based simulations, as well as the Ultrarelativistic Quantum Molecular Dynamics model, to assess the impact of limited statistics on the measurements of and of net-proton distributions at lower RHIC energies. Both ratios decrease from the unity baseline as we reduce statistics, and could even turn negative without a pertinent physics mechanism. By incorporating statistics akin to experimental data, we can replicate the net-proton and values comparable to the corresponding measurements for Au+Au collisions at 7.7, 11.5 and 14.5 GeV. Our findings underscore a caveat to the interpretation of the observed beam energy dependence of hyper-order cumulants.

    nucl-thnucl-exPRC(2024)·6 citations
  3. 03

    Dense Hadronic Matter in Neutron Stars

    Laura Tolos🇪🇸

    In this lecture we discuss the properties of dense hadronic matter inside neutron stars. In particular, we pay attention to the role of strangeness in the core of neutron stars, by analysing the presence of baryons and mesons with strangeness. We consider two interesting possible scenarios in their interior, that is, the existence of hyperons leading to the so-called hyperon puzzle and the presence of a kaon condensed phase inside neutron stars.

    nucl-thastro-ph.HEhep-phActa Phys.Polon.B(2024)·4 citations
  4. 04

    Method of moments for a relativistic single-component gas

    Caio V. P. de Brito🇧🇷 · Gabriel S. Denicol🇧🇷

    We derive the equations of motion for all the irreducible moments of the single-particle distribution function. We find that these moment equations of motion are highly coupled, with the dynamics of lower-rank moments always being coupled to those of a higher-rank, leading to an endless tower of equations. Considering a massless gas in Bjorken flow, we investigate how this hierarchy of differential equations can be properly truncated and solved.

    nucl-thPRD(2024)·10 citations
  5. 05

    Chiral confining Hartree-Fock Lagrangians based on Nambu-Jona--Lasino model

    M. Chamseddine🇫🇷 · J. Margueron🇫🇷 · H. Hansen🇫🇷 · G. Chanfray🇫🇷

    We study a relativistic Hartree-Fock Lagrangian model which considers confinement, chiral symmetry breaking, nucleon form factor and short range correlations. The chiral potential originally based on the linear sigma-model is compared to an improved potential generated by the Nambu-Jona--Lasino (NJL) model for quark interaction. Our model is also anchored in fundamental hadronic properties predicted by Lattice-QCD calculations and a few nuclear empirical properties. We explore in a Bayesian approach the role of the saturation density, the energy per particle and the incompressibility modulus for the model selection. We find that most of our models could not reproduce these empirical quantities, unless a phenomenological "missing" energy is added. The properties of this "missing" energy are therefore inferred from our Bayesian analysis and we obtain that it shall be attractive. Finally we analyse the origin of the break down density in relativistic approaches and we relate it to the properties of the scalar potential.

    nucl-thEPJA(2024)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE