Evolution of strangeness in an equilibrating and expanding quark-gluon plasma

Pal, Dipali; Sen, Abhijit; Mustafa, Munshi G.; Srivastava, D. K.

doi:10.1103/physrevc.65.034901

Cited by 23 publications

(24 citation statements)

References 33 publications

(45 reference statements)

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“…However, there remains dependence on the history of the QGP fireball in models in which gluon (and light quark) chemical equilibrium is not attained even in central reactions at RHIC [25,26]. Thus only if gluons in QGP did not approach the chemical equilibrium at τ f , a signature of this condition would be seen in the strangeness yield as is seen considering the right hand side of Eq.…”

Section: Study Of the Dependence On Initial Thermalization Conditionmentioning

confidence: 97%

“…The chemical relaxation times for the strangeness approach to chemical equilibrium, in an expanding QGP, has been considered several times before [3,21,22,23,24,25,26]. The study of QGP strangeness chemical equilibration must not be confused with the phenomenological investigation of chemical equilibrium in the final state hadron abundance.…”

Section: Introductionmentioning

confidence: 99%

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Strangeness chemical equilibration in a quark-gluon plasma

Letessier

Rafelski

2007

Phys. Rev. C

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We study, in the dynamically evolving QGP fireball formed in relativistic heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward and beyond the chemical equilibrium. We account for the contribution of the direct strangeness production and evaluate the thermal-QCD strangeness production mechanisms. The specific yield of strangeness per entropy,s/S, is the primary target variable. We explore the effect of collision impact parameter, i.e., fireball size, on kinetic strangeness chemical equilibration in QGP. Insights gained in study the RHIC data with regard to the dynamics of the fireball are applied to the study strangeness production at the LHC. We use these results and consider the strange hadron relative particle yields at RHIC and LHC in a systematic fashion. We consider both the dependence on s/S and directly participant number dependence.

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Section: Study Of the Dependence On Initial Thermalization Conditionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Strangeness chemical equilibration in a quark-gluon plasma

Letessier

Rafelski

2007

Phys. Rev. C

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“…with Z = p/T and Z s = [Z 2 + ( m s T ) 2 ] 1/2 are easily calculated, numerically, where the mass of the s quark m s is taken as 150 MeV as done in [33].…”

Section: Evolution Of the Systemmentioning

confidence: 99%

Photon emission from a chemically non-equilibrated parton gas at finite baryon density

Long

et al. 2006

Nuclear Physics A

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“…In order to account for the regeneration via correlated b −b pairs in our current UMQS model, we considered the deexcitation of octet state to singlet state via emitting a gluon. We calculated this de-excitation in terms of recombination cross-section σ f,nl for bottomonium in QGP by using the detailed balance from the gluonic dissociation cross-section σ d,nl [51]: is their respective fugacity terms [83]. We have calculated the relative velocity of b −b pair in medium given by:…”

Section: Regeneration Factormentioning

confidence: 99%

Centrality and transverse momentum dependent suppression of $$\Upsilon (1S)$$ Υ ( 1 S ) and $$\Upsilon (2S)$$

2019

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Deconfined QCD matter in heavy-ion collisions has been a topic of paramount interest for many years. Quarkonia suppression in heavy-ion collisions at the relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) experiments indicate the quark-gluon plasma (QGP) formation in such collisions. Recent experiments at LHC have given indications of hot matter effect in asymmetric p-Pb nuclear collisions. Here, we employ a theoretical model to investigate the bottomonium suppression in Pb-Pb at √ s N N = 2.76, 5.02 TeV, and in p-Pb at √ s N N = 5.02 TeV center-of-mass energies under a QGP formation scenario. Our present formulation is based on an unified model consisting of suppression due to color screening, gluonic dissociation along with the collisional damping. Regeneration due to correlated QQ pairs has also been taken into account in the current work. We obtain here the net bottomonium suppression in terms of survival probability under the combined effect of suppression plus regeneration in the deconfined QGP medium. We mainly concentrate here on the centrality, N part and transverse momentum, p T dependence of ϒ(1S) and ϒ(2S) states suppression in Pb-Pb and p-Pb collisions at mid-rapidity. We compare our model predictions for ϒ(1S) and ϒ(2S) suppression with the corresponding experimental data obtained at the LHC energies. We find that the experimental observations on p t and N part dependent suppression agree reasonably well with our model predictions.

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Evolution of strangeness in an equilibrating and expanding quark-gluon plasma

Cited by 23 publications

References 33 publications

Strangeness chemical equilibration in a quark-gluon plasma

Strangeness chemical equilibration in a quark-gluon plasma

Photon emission from a chemically non-equilibrated parton gas at finite baryon density

Centrality and transverse momentum dependent suppression of $$\Upsilon (1S)$$ Υ ( 1 S ) and $$\Upsilon (2S)$$

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