Nuclear Theory·nucl-th

Wednesday·August 10, 2022

10 papers—5 primary·5 cross-listed

06
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 $\sim 1 GeV^{2}$ .
↳ hep-phnucl-thPRD(2023)·18 citations
07
Measurement of Light Nuclei Production in Heavy-ion Collisions by the STAR experiment
Hui Liu (for the STAR Collaboration)🇨🇳
In these proceedings, we present the measurements of centrality, transverse momentum and rapidity dependences of proton ( $p$ ) and light nuclei ( $d$ ( $d$ ), $t$ , $^{3} He$ ( $^{3} He$ ), and $^{4} He$ ) production in Au+Au collisions at $s_{NN}$ = 3 GeV, and isobaric (Ru+Ru and Zr+Zr) collisions at $s_{NN}$ = 200 GeV. The compound yield ratios in central collisions at 3 GeV are found to be larger than the transport model calculations. Furthermore, the kinetic freeze-out parameters at 3 GeV show a different trend compared to those of light hadrons ( $π$ , $K$ , $p$ ) at higher energies.
↳ nucl-exnucl-thActa Phys.Polon.Supp.(2023)·8 citations
08
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
09
Nucleon-nucleon potential from instanton holonomies
Chris Halcrow🇸🇪 · Derek Harland🇬🇧
We derive the nucleon-nucleon interaction from the Skyrme model using the instanton and product approximations to skyrmion dynamics. In doing so, we also calculate the classical potential and metric for skyrmion dynamics in each of the approximations. This is the first time they have been compared in detail and the results show major disagreements between the approximations. We derive the eight low energy nucleon-nucleon interaction potentials and compare them with the Paris model. For the instanton approximation we find strong negative isoscalar and isovector spin-orbit potentials, matching phenomenological models and our geometric intuition. Results for the other potentials are mixed, in part due to the zero pion mass limit used in this approximation.
↳ hep-thnucl-thPRD(2022)·9 citations
10
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

Affiliations

first authorsco-authorsvia INSPIRE

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

Measurement of Light Nuclei Production in Heavy-ion Collisions by the STAR experiment

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

Nucleon-nucleon potential from instanton holonomies

Thermal Contributions to Primordial Nucleosynthesis

Affiliations