Nuclear Theory·nucl-th

Wednesday·February 20, 2019

8 papers—5 primary·3 cross-listed

06
The role of the stochastic color field fluctuations on $J / ψ$ suppression in ultra-relativistic heavy-ion collisions
Ashik Ikbal Sheikh🇮🇳 · Zubayer Ahammed🇮🇳 · M.G. Mustafa🇮🇳
We consider the effect of the stochastic color field fluctuations in addition to the collisional as well as the radiative energy losses in the propagation of charm quarks in the hot and dense deconfined medium of quarks and gluons created in ultra-relativistic heavy-ion collisions. These fluctuations lead to energy gain of the propagating charm quarks. We construct and solve Langevin transport equations for charm quarks under the evolving background matter described by the ( $3 + 1$ )-D relativistic viscous hydrodynamics. Considering the energy gain of charm quarks, the nuclear modification factor $R_{AA}$ of $J / ψ$ is calculated. Interestingly, the experimental measurements for $J / ψ$ suppression in $A u - A u$ collisions at $s_{N N} = 200$ GeV by PHENIX Collaboration and $P b - P b$ collisions at $s_{N N} = 2.76$ TeV by ALICE and CMS Collaborations, can be nicely described with the effect of these field fluctuations without invoking the regeneration phenomena.
↳ hep-phnucl-th0 citations
07
Thermodynamics of Bose gases from functional renormalization with a hydrodynamic low-energy effective action
Felipe Isaule · Michael C. Birse · Niels R. Walet
The functional renormalization group for the effective action is used to construct an effective hydrodynamic description of weakly interacting Bose gases. We employ a scale-dependent parametrization of the boson fields developed previously to start the renormalization evolution in a Cartesian representation at high momenta and interpolate to an amplitude-phase one in the low-momentum regime. This technique is applied to Bose gases in one, two and three dimensions, where we study thermodynamic quantities such as the pressure and energy per particle. The interpolation leads to a very natural description of the Goldstone modes in the physical limit, and compares well to analytic and Monte-Carlo simulations at zero temperature. The results show that our method improves aspects of the description of low-dimensional systems, with stable results for the superfluid phase in two dimensions and even in one dimension.
↳ cond-mat.quant-gasnucl-thphysics.atom-phAnnals Phys.(2020)·13 citations
08
Elliptical flow coalescence to identify the $f_{0}$ (980) content
An Gu🇺🇸 · Terrence Edmonds🇺🇸 · Jie Zhao🇺🇸 · Fuqiang Wang🇺🇸
We use a simple coalescence model to generate $f_{0}$ (980) particles for three configurations: a $s s ˉ$ meson, a $u u ˉ s s ˉ$ tetraquark, and a $K^{+} K^{-}$ molecule. The phase-space information of the coalescing constituents is taken from a multi-phase transport (AMPT) simulation of heavy-ion collisions. It is shown that the number of constituent quarks scaling of the elliptic flow anisotropy can be used to discern $s s ˉ$ from $u u ˉ s s ˉ$ and $K^{+} K^{-}$ configurations.
↳ nucl-exnucl-thPRC(2020)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

The role of the stochastic color field fluctuations on J/ψ suppression in ultra-relativistic heavy-ion collisions

Thermodynamics of Bose gases from functional renormalization with a hydrodynamic low-energy effective action

Elliptical flow coalescence to identify the f0​(980) content

Affiliations

The role of the stochastic color field fluctuations on $J / ψ$ suppression in ultra-relativistic heavy-ion collisions

Elliptical flow coalescence to identify the $f_{0}$ (980) content