Nuclear Theory·nucl-th

Wednesday·March 20, 2024

6 papers—1 primary·5 cross-listed

02
[Submitted on 19 Mar 2024] (cross-list from hep-ph)
The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC
Tom Reichert🇩🇪 · Jan Steinheimer🇩🇪 · Volodymyr Vovchenko🇩🇪 · Christoph Herold🇹🇭 · Ayut Limphirat🇹🇭 · Marcus Bleicher🇩🇪
It is shown that the hadronic phase in ultra-relativistic heavy ion collisions can be used to understand the properties of the $f_{0} (980)$ resonance. In particular it is shown that the centrality dependence of the $f_{0} (980) / π$ and $f_{0} (980) / ϕ$ ratios depends strongly on the $f_{0} (980) \to K + K$ branching ratio and whether the $f_{0} (980)$ is produced as a $∣ q q ⟩$ or $∣ s s ⟩$ state. These conclusions are drawn from calculations within the partial chemical equilibrium of the HRG model within Thermal-FIST as well as with the fully non-equilibrium hybrid-transport approach UrQMD. Our findings show how the hadronic phase in heavy ion collisions can be used for studies of exotic hadron properties otherwise possible only in dedicated experiments such as PANDA.
Comments:
10 pages, 6 figures, version accepted for publication
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2403.12629 [pdf]
EPJC(2024)·3 citations
03
[Submitted on 19 Mar 2024] (cross-list from hep-ph)
Compositeness of near-threshold $s$ -wave resonances
Tomona Kinugawa🇯🇵 · Tetsuo Hyodo🇯🇵
The near-threshold clustering phenomenon is well understood by the low-energy universality, for shallow bound states below the threshold. Nevertheless, the characteristics of resonances slightly above the threshold still lack thorough elucidation. We introduce a novel probabilistic interpretation scheme for complex compositeness of resonances, in which resonances with large decay widths fall outside the domain where their internal structure can be interpreted probabilistically. Employing this scheme to analyze resonances via the effective range expansion, we demonstrate that near-threshold resonances have a small composite fraction, in sharp contrast to shallow bound states below the threshold.
Comments:
29 pages, 10 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2403.12635 [pdf]
16 citations
04
[Submitted on 19 Mar 2024] (cross-list from hep-th)
An example of the convergence of hydrodynamics in strong external fields
Casey Cartwright🇳🇱
The anti-de-Sitter/conformal field theory (AdS/CFT) correspondence is used to provide an estimate of the radius of convergence of the linearized gradient expansion of the hydrodynamic description of $N = 4$ supersymmetric Yang-Mills (SYM) theory minimally coupled to $U (1)$ gauge theory subjected to strong magnetic fields. The results of this work demonstrate that the dispersion relations of hydrodynamic modes continue to converge for magnetic field strengths far beyond those values for which a hydrodynamic description is expected. For magnetic field strengths much larger then the temperature scale the bulk dual interpolates between AdS $_{4 + 1}$ and the product of a Bañados-Teitelboim-Zanelli (BTZ) black hole and a two dimensional manifold (BTZ $_{2 + 1} \times R^{2}$ ), and may be regarded as a renormalization group flow of the $3 + 1$ dimensional CFT to a $1 + 1$ dimensional CFT. In this regime, we clarify past literature on the quasi-normal mode (QNM) spectrum of bulk scalar fields by introducing a new way to classify the behavior of QNM collisions in the complex frequency and momentum plane.
Comments:
To appear in PRD. Accepted version: 16 pages, 6 figures
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2403.12638 [pdf]
PRD(2024)·8 citations
05
[Submitted on 19 Mar 2024] (cross-list from hep-ph)
$J / ψ$ production within a jet in high-energy proton-proton and nucleus-nucleus collisions
Shan-Liang Zhang🇨🇳 · Hongxi Xing🇨🇳
Within the framework of leading power factorization formalism of nonrelativistic quantum chromodynamics, we calculate the jet fragmentation function for $J / ψ$ production in proton-proton (pp) collisions ranging from $s = 500$ GeV to $13$ TeV. The reasonable agreements between theory and experimental data indicate that $J / ψ$ production within a jet is mainly dominated by gluon fragmentation. Such a mechanism can be further tested by the predicted jet transverse momentum and radius dependence of jet fragmentation function. Based on the satisfying description of pp baseline, we carry out the first theoretical investigation on medium modification on $J / ψ$ production within jet in heavy-ion collisions at the Large Hadron Collider, using a linear Boltzmann transport model combined with hydrodynamics for the simulation of jet-medium interaction. The consistency with the experimental measurement on nuclear modification factor $R_{AA}$ by CMS collaboration reveals that the gluon jet quenching is the driving force for the suppression of $J / ψ$ production in jet. Furthermore, we make predictions for the dependence of $R_{AA}$ on the jet transverse momentum and jet radius $R$ , which can be tested in future measurements to further constrain the flavor dependence of jet quenching.
Comments:
7 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2403.12704 [pdf]
PLB(2025)·8 citations
06
[Submitted on 19 Mar 2024] (cross-list from hep-ph)
Extraction of trans-helicity worm-gear distributions and opportunities at the Electron-Ion Collider in China
Ke Yang🇨🇳 · Tianbo Liu🇨🇳 · Peng Sun🇨🇳 · Yuxiang Zhao🇨🇳 · Bo-Qiang Ma🇨🇳
We present a global analysis of the trans-helicity worm-gear distribution function, $g_{1 T}^{⊥}$ , by fitting the longitudinal-transverse double spin asymmetry data of the semi-inclusive deep inelastic scattering. The analysis is performed within the framework of transverse momentum dependent factorization and evolution. It is found that the $u$ -quark favors a positive distribution and the $d$ -quark favors a negative distribution, which is consistent with previous model calculations and phenomenological extractions. Based on the fit to existing world data, we also study the impact of the proposed electron-ion collider in China and conclude that it can significantly improve the precision of the worm-gear distribution function and hence enhance our understanding of nucleon spin structures.
Comments:
17 pages, 11 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2403.12795 [pdf]
PRD(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC

Compositeness of near-threshold s-wave resonances

An example of the convergence of hydrodynamics in strong external fields

J/ψ production within a jet in high-energy proton-proton and nucleus-nucleus collisions

Extraction of trans-helicity worm-gear distributions and opportunities at the Electron-Ion Collider in China

Affiliations

Compositeness of near-threshold $s$ -wave resonances

$J / ψ$ production within a jet in high-energy proton-proton and nucleus-nucleus collisions