Nuclear Theory·nucl-th

Tuesday·June 1, 2021

14 papers—8 primary·6 cross-listed

09
New insight on the quark condensate beyond chiral limit
Ling-feng Chen🇨🇳 · Zhan Bai🇨🇳 · Fei Gao🇩🇪 · Yu-xin Liu🇨🇳
With analyzing the mass function obtained by solving Dyson-Schwinger Equations, we propose a cut-off independent definition of quark condensate beyond chiral limit. With this well-defined condensate, we then analyze the evolution of the condensate and its susceptibility with the current quark mass. The susceptibility shows a critical mass in the neighborhood of the s-quark current mass, which defines a transition boundary for internal hadron dynamics.
↳ hep-phnucl-thPRD(2021)·7 citations
10
Do we need to use regularization on the thermal part in the NJL model?
Kai Xue🇨🇳 · Xiaozhu Yu🇨🇳 · Xinyang Wang🇨🇳
The Nambu--Jona-Lasinio (NJL) model is one of the most useful tools to study non-perturbative strong interaction matter. Because it is a nonrenormalizable model, the choosing of regularization is a subtle issue. In this paper, we discuss one of the general things of the regularization in the NJL model, which is whether we need to use the regularization on the thermal part by evaluating the quark chiral condensate and thermal properties in the two-flavor NJL model. The calculations in this work include three regularization schemes that contain both gauge covariant and invariant schemes. We found no matter which regularization scheme we choose, it is necessary to use the regularization on the thermal part when calculating the chiral condensate related physics quantities and do not use the regularization on the thermal part when calculating the grand potential related physical quantities.
↳ hep-phnucl-thCPC(2022)·13 citations
11
Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at $s_{NN} =$ 27, 54.4, and 200 GeV at RHIC
STAR Collaboration: M. S. Abdallah · J. Adam · L. Adamczyk · J. R. Adams · J. K. Adkins · G. Agakishiev · I. Aggarwal · M. M. Aggarwal · Z. Ahammed · I. Alekseev · D. M. Anderson · A. Aparin and 381 other authors
According to first principle Lattice QCD calculations, the transition from quark-gluon plasma to hadronic matter is a smooth crossover in the region $μ_{B} \leq T_{c}$ . In this range the ratio, $C_{6} / C_{2}$ , of net-baryon distributions are predicted to be negative. In this paper, we report the first measurement of the midrapidity net-proton $C_{6} / C_{2}$ from 27, 54.4 and 200 GeV Au+Au collisions at RHIC. The dependence on collision centrality and kinematic acceptance in ( $p_{T}$ , $y$ ) are analyzed. While for 27 and 54.4 GeV collisions the $C_{6} / C_{2}$ values are close to zero within uncertainties, it is observed that for 200 GeV collisions, the $C_{6} / C_{2}$ ratio becomes progressively negative from peripheral to central collisions. Transport model calculations without critical dynamics predict mostly positive values except for the most central collisions within uncertainties. These observations seem to favor a smooth crossover in the high energy nuclear collisions at top RHIC energy.
↳ nucl-exhep-exhep-phnucl-thPRL(2021)·76 citations
12
A systematic analysis of transverse momentum spectra of $J / ψ$ mesons in high energy collisions
Xu-Hong Zhang🇨🇳 · Fu-Hu Liu🇨🇳 · Khusniddin K. Olimov🇺🇿
We aggregate the transverse momentum spectra of $J / ψ$ mesons produced in high energy gold-gold (Au-Au), deuteron-gold ( $d$ -Au), lead-lead (Pb-Pb), proton-lead ( $p$ -Pb), and proton-(anti)proton ( $p$ - $p (p)$ ) collisions measured by several collaborations at the Relativistic Heavy Ion collider (RHIC), the Tevatron Proton-Antiproton Collider, and the Large Hadron Collider (LHC). The collision energy (the center-of-mass energy) gets involved in a large range from dozens of GeV to 13 TeV (the top LHC energy). We consider two participant or contributor partons, a charm quark and an anti-charm quark, in the production of $J / ψ$ . The probability density of each quark is described by means of the modified Tsallis--Pareto-type function (the TP-like function) while considering that both quarks make suitable contributions to the $J / ψ$ transverse momentum spectrum. Therefore, the convolution of two TP-like functions is applied to represent the $J / ψ$ spectrum. We adopt the mentioned convolution function to fit the experimental data and find out the trends of the power exponent, effective temperature, and of the revised index with changing the centrality, rapidity, and collision energy. Beyond that, we capture the characteristic of $J / ψ$ spectrum, which is of great significance to better understand the production mechanism of $J / ψ$ in high energy collisions.
↳ hep-phhep-exnucl-exnucl-thIJMPE(2021)·9 citations
13
Search for doubly-heavy dibaryons in the quark-delocalization color-screening model
Zhuocheng Xia🇨🇳 · Saijun Fan🇨🇳 · Xinmei Zhu🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳
We perform a systemical investigation of the low-lying doubly-heavy dibaryon systems with strange $S = 0$ , isospin $I = 0$ , $1$ , $2$ and the angular momentum $J = 0$ , $1$ , $2$ , $3$ in the quark delocalization color screening model. We find the effect of channel-coupling cannot be neglected in the study of the multi-quark systems. Due to the heavy flavor symmetry, the results of the doubly-charm and doubly-bottom dibaryon systems are similar with each other. Both of them have three bound states, the quantum numbers of which are $I J = 00$ , $I J = 02$ and $I J = 13$ , respectively. The energies are $4554$ MeV, $4741$ MeV, and $4969$ MeV respectively for the doubly-charm systems and $11219$ MeV, $11416$ MeV, and $11633$ MeV respectively for the doubly-bottom dibaryon systems. Besides, six resonance states are obtained, which are $I J = 00$ $N Ξ_{cc}$ and $N Ξ_{bb}$ with resonance mass of $4716$ MeV and $11411$ MeV respectively, $I J = 11$ $N Ξ_{cc}^{*}$ and $N Ξ_{bb}^{*}$ with resonance mass of $4757$ MeV and $11432$ MeV respectively, and $I J = 12$ $Σ_{c} Σ_{c}^{*}$ and $Σ_{b} Σ_{b}^{*}$ with resonance mass of $4949$ MeV and $11626$ MeV respectively. All these heavy dibaryons are worth searching for on experiments, although it will be a challenging work.
↳ hep-phnucl-thPRC(2022)·29 citations
14
Probing gluon Bose correlations in DIS
Alex Kovner🇺🇸 · Ming Li🇺🇸 · Vladimir V. Skokov🇺🇸
We study correlations originating from the quantum nature of gluons in a hadronic wave function. Bose-Einstein correlation between identical particles lead to the enhancement in the number of pairs of gluons with the same quantum numbers and small relative momentum. We show that these preexisting correlations can be probed in Deep Inelastic Scattering experiments at high energy. Specifically, we consider diffractive dijet plus a third jet production. The azimuthal dependence displays a peak at the zero relative angle between the transverse momentum imbalance of the photon-going dijet and the transverse momentum of the hadron-going jet. Our calculations explicitly show that the peak originates from Bose enhancement. Comparing electron-proton to electron-nucleus collisions, we demonstrate that the nuclear target enhances the relative strength of the peak. With the future high luminosity Electron-Ion Collider the proposed measurements of gluon Bose enhancement become experimentally feasible.
↳ hep-phnucl-thPRL(2022)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

New insight on the quark condensate beyond chiral limit

Do we need to use regularization on the thermal part in the NJL model?

Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at sNN​​= 27, 54.4, and 200 GeV at RHIC

A systematic analysis of transverse momentum spectra of J/ψ mesons in high energy collisions

Search for doubly-heavy dibaryons in the quark-delocalization color-screening model

Probing gluon Bose correlations in DIS

Affiliations

Measurement of the Sixth-Order Cumulant of Net-Proton Multiplicity Distributions in Au+Au Collisions at $s_{NN} =$ 27, 54.4, and 200 GeV at RHIC

A systematic analysis of transverse momentum spectra of $J / ψ$ mesons in high energy collisions