scholarly journals Probing the gluon plasma with charm balance functions

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Sumit Basu ◽  
Peter Christiansen ◽  
Alice Ohlson ◽  
David Silvermyr
Keyword(s):  
Chemical Equilibrium ◽  
Quark Gluon Plasma ◽  
Light Quark ◽  
Gluon Plasma ◽  
Charm Quarks ◽  
Significant Time ◽  
Large Systems ◽  
Microscopic Picture ◽  
Balance Functions ◽  
Extreme Scenario

AbstractRecent theoretical explanations for how hydrodynamic-like flow can build up quickly in small collision systems (hydrodynamization) has led to a microscopic picture of flow building up in a gluon-dominated phase before chemical equilibrium between quarks and gluons has been attained. The goal of this contribution to Offshell-2021 is to explore consequence of assuming a long-lived gluon-dominated phase, which we shall denote a gluon plasma (GP). As these consequences are naturally enhanced in a large systems, we assume and explore the extreme scenario in which a GP would be created in AA collisions and exist for significant time before the formation of a chemically-equilibrated quark-gluon plasma (QGP). The GP and its formation would be impossible to probe with light-quark hadrons, which are first produced later in this scenario. As charm quarks are produced early in the collision, they can circumvent the limitations of light quarks and we propose charm balance functions as an effective tool to test this idea and constrain the dynamics of the GP.

CHARM QUARK THERMALIZATION IN QUARK-GLUON PLASMA

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2048-2054 ◽  
Author(s):  
LI YAN ◽  
PENGFEI ZHUANG ◽  
NU XU
Keyword(s):  
Relaxation Time ◽  
Quark Gluon Plasma ◽  
Transport Model ◽  
Charm Quark ◽  
Gluon Plasma ◽  
Transverse Momentum Distribution ◽  
Hydrodynamic Description ◽  
Charm Quarks ◽  
Relaxation Time Approximation ◽  
Quark Transverse Momentum

The charm quark thermalization in quark-gluon plasma is described by a transport model in relaxation time approximation. Combining the transport equation for charm quarks with the hydrodynamic description for the medium, we calculated the charm quark transverse momentum distribution and discussed its dependence on the relaxation time.

scholarly journals STUDY OF VECTOR MESON FRAGMENTATION USING A BROKEN SU(3) MODEL

2012 ◽  
Vol 27 (19) ◽  
pp. 1250103 ◽  
Author(s):  
D. INDUMATHI ◽  
H. SAVEETHA
Keyword(s):  
Quark Gluon Plasma ◽  
Light Quark ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Dglap Evolution ◽  
Relativistic Heavy Ion Collider ◽  
Breaking Parameter ◽  
Fragmentation Functions ◽  
Scaled Energy ◽  
Gluon Fragmentation

Inclusive hadro-production in e+e- annihilation processes is examined to study the fragmentation process. A broken SU(3) model is used to determine the quark and gluon fragmentation functions of octet vector mesons, ρ and K*, in a simple way with an SU(3) breaking parameter λ. These are expressed in terms of just two light quark fragmentation functions, V(x, Q2) and γ(x, Q2) and the gluon fragmentation function Dg(x, Q2). These functions are parametrized at the low input scale of [Formula: see text], evolved through LO DGLAP evolution including charm and bottom flavor at appropriate thresholds, and fitted by comparison with data at the Z-pole. The model is extended with the introduction of a few additional parameters to include a study of singlet–octet mixing and hence ω and ϕ fragmentation. The model gives good fits to the available data for x ≳0.01, where x is the scaled energy of the hadron. The model is then applied successfully to ω, ϕ production in pp collisions at the relativistic heavy ion collider, RHIC, these data form an important baseline for the study of Quark Gluon Plasma in heavy nucleus collisions at RHIC, and also in future at the LHC.

scholarly journals Large momenta fluctuations of charm quarks in the Quark-Gluon Plasma⋆

2005 ◽  
Vol 26 (3) ◽  
pp. 333-337 ◽  
Author(s):  
S. Terranova ◽  
D. M. Zhou ◽  
A. Bonasera
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Charm Quarks

scholarly journals Erratum: Propagation of charm quarks in equilibrating quark-gluon plasma [Phys. Rev. C 57, 889 (1998)]

1998 ◽  
Vol 57 (6) ◽  
pp. 3499-3499 ◽  
Author(s):  
Munshi Mustafa ◽  
Dipali Pal ◽  
Dinesh Srivastava
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Plasma Phys ◽  
Charm Quarks

scholarly journals Tomography of the quark-gluon plasma by charm quarks

2015 ◽  
Vol 92 (1) ◽  
Author(s):  
Taesoo Song ◽  
Hamza Berrehrah ◽  
Daniel Cabrera ◽  
Juan M. Torres-Rincon ◽  
Laura Tolos ◽  
...  
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Charm Quarks

scholarly journals Propagation of charm quarks in equilibrating quark-gluon plasma

1998 ◽  
Vol 57 (2) ◽  
pp. 889-898 ◽  
Author(s):  
Munshi Golam Mustafa ◽  
Dipali Pal ◽  
Dinesh Kumar Srivastava
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Charm Quarks

scholarly journals Towards the quark-gluon plasma Equation of State with dynamical strange and charm quarks

2016 ◽  
Vol 668 ◽  
pp. 012092 ◽  
Author(s):  
Florian Burger ◽  
Ernst-Michael Ilgenfritz ◽  
Maria Paola Lombardo ◽  
Michael Müller-Preussker ◽  
Anton Trunin
Keyword(s):  
Equation Of State ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Charm Quarks ◽  
Plasma Equation

scholarly journals Measurements of Λc+ in pp, p–Pb and Pb–Pb collisions with ALICE at the LHC

2020 ◽  
Vol 1643 (1) ◽  
pp. 012011
Author(s):  
C Hills
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Lhcb Collaboration ◽  
Charm Quarks ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Model Predictions ◽  
Modification Factor

Abstract The baryon-to-meson ratio Λ c + / D 0 and the nuclear modification factor RAA in the charm sector are important observables to gain an understanding of how charm quarks hadronise and lose energy in the Quark-Gluon Plasma produced in heavy-ion collisions. In this contribution, recent measurements performed with the ALICE detector in pp, p–Pb and Pb–Pb collisions at 5.02 TeV are presented and compared with previous measurements in pp collisions at 7 TeV, measurements by the LHCb Collaboration and theoretical model predictions.

scholarly journals Chemical Evolution of Strongly Interacting Quark-Gluon Plasma

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Ying-Hua Pan ◽  
Wei-Ning Zhang
Keyword(s):  
Chemical Equilibrium ◽  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Short Time Scale ◽  
Ion Collisions ◽  
Strongly Interacting ◽  
Quark Production ◽  
Short Time

At very initial stage of relativistic heavy ion collisions a wave of quark-gluon matter is produced from the break-up of the strong color electric field and then thermalizes at a short time scale (~1 fm/c). However, the quark-gluon plasma (QGP) system is far out of chemical equilibrium, especially for the heavy quarks which are supposed to reach chemical equilibrium much late. In this paper a continuing quark production picture for strongly interacting QGP system is derived, using the quark number susceptibilities and the equation of state; both of them are from the results calculated by the Wuppertal-Budapest lattice QCD collaboration. We find that the densities of light quarks increase by 75% from the temperatureT=400 MeV toT=150 MeV, while the density of strange quark annihilates by 18% in the temperature region. We also offer a discussion on how this late production of quarks affects the final charge-charge correlations.

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