Nuclear Theory·nucl-th

Wednesday·January 4, 2023

3 papers—1 primary·2 cross-listed

01
Energy dependence of heavy-ion initial condition in isobar collisions
Somadutta Bhatta🇺🇸 · Chunjian Zhang🇺🇸 · Jiangyong Jia🇺🇸
Collisions of isobar nuclei, those with the same mass number but different structure parameters, provide a new way to probe the initial condition of the heavy ion collisions. Using transport model simulation of $^{96}$ Ru+ $^{96}$ Ru and $^{96}$ Zr+ $^{96}$ Zr collisions at two energies $s_{NN} = 0.2$ TeV and 5.02 TeV, where $^{96}$ Ru and $^{96}$ Zr nuclei have significantly different deformations and radial profiles, we identify sources of eccentricities contributing independently to the final state harmonic flow $v_{n}$ . The efficacy for flow generation differs among these sources, and explains the modest energy dependence of the isobar ratios of $v_{n}$ . Additionally, a significant component of $v_{n}$ is found to be uncorrelated with the eccentricity but is instead generated dynamically during system evolution. Experimental measurement of these ratios at the LHC energy and comparison with RHIC energy can provide insight into the collision-energy dependence of the initial condition.
nucl-thnucl-exPLB(2024)·9 citations
02
The $Σ$ and $Ξ$ electromagnetic form factors in the extended vector meson dominance model
Bing Yan🇨🇳 · Cheng Chen🇨🇳 · Ju-Jun Xie🇨🇳
We propose a phenomenological extended vector meson dominance model for the baryon electromagnetic structure, and it is found that the current experimental data on the $Σ$ and $Ξ$ electromagnetic form factors in the time-like region can be well described. Meanwhile, we can also reproduce the ratios of the total cross sections of reactions $e^{+} e^{-} \to Σ^{+} Σ ˉ^{-}$ , $Σ^{0} Σ ˉ^{0}$ , and $Σ^{-} Σ ˉ^{+}$ , which are $9.7 \pm 1.3 : 3.3 \pm 0.7 : 1$ at center-of-mass energies from $2.3864$ to $3.02$ GeV. We also analytically continue the expression of the form factors to space-like region and estimate the charge radii of the $Σ$ and $Ξ$ hyperons. The result for the $Σ^{-}$ is in agreement with the experimental date.
↳ hep-phnucl-thPRD(2023)·24 citations
03
Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution
Michael Strickland🇺🇸
In this proceedings contribution I review recent work which computes the suppression of bottomonium production in heavy-ion collisions using open quantum systems methods applied within the potential non-relativistic quantum chromodynamics (pNRQCD) effective field theory. I discuss how the computation of bottomonium suppression can be reduced to solving a Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation for the evolution of the b-bbar reduced density matrix. The open quantum systems approach used allows one to take into account the non-equilibrium dynamics and decoherence of bottomonium in the quark-gluon plasma. Finally, I present comparisons of phenomenological predictions obtained using a recently obtained next-to-leading-order GKSL equation with ALICE, ATLAS, and CMS experimental data for bottomonium suppression and elliptic flow.
↳ hep-phnucl-thActa Phys.Polon.Supp.(2023)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Energy dependence of heavy-ion initial condition in isobar collisions

The Σ and Ξ electromagnetic form factors in the extended vector meson dominance model

Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution

Affiliations

The $Σ$ and $Ξ$ electromagnetic form factors in the extended vector meson dominance model