scholarly journals Quarkonium Phenomenology from a Generalised Gauss Law

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 119 ◽  
Author(s):  
David Lafferty ◽  
Alexander Rothkopf
Keyword(s):  
Chemical Potential ◽  
Heavy Ion ◽  
Temperature Dependent ◽  
Ion Collisions ◽  
Debye Mass ◽  
Single Temperature ◽  
Consistent Manner ◽  
Dependent Parameter ◽  
Quark Potential ◽  
Heavy Quark Potential

We present an improved analytic parametrisation of the complex in-medium heavy quark potential derived rigorously from the generalised Gauss law. To this end we combine in a self-consistent manner a non-perturbative vacuum potential with a weak-coupling description of the QCD medium. The resulting Gauss-law parametrisation is able to reproduce full lattice QCD data by using only a single temperature dependent parameter, the Debye mass m D . Using this parametrisation we model the in-medium potential at finite baryo-chemical potential, which allows us to estimate the Ψ ′ / J / Ψ ratio in heavy-ion collisions at different beam energies.

scholarly journals Equation of States and Charmonium Suppression in Heavy-Ion Collisions

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Indrani Nilima ◽  
Vineet Kumar Agotiya
Keyword(s):  
Equation Of State ◽  
Heavy Ion ◽  
Particle Model ◽  
Quasi Particle ◽  
Ion Collisions ◽  
Debye Mass ◽  
Charmonium Suppression ◽  
Quark Potential ◽  
Heavy Quark Potential ◽  
Charmonium States

The present article is the follow-up of our work Bottomonium suppression in quasi-particle model, where we have extended the study for charmonium states using quasi-particle model in terms of quasi-gluons and quasi quarks/antiquarks as an equation of state. By employing medium modification to a heavy quark potential thermodynamic observables, viz., pressure, energy density, speed of sound, etc. have been calculated which nicely fit with the lattice equation of state for gluon, massless, and as well massive flavored plasma. For obtaining the thermodynamic observables we employed the debye mass in the quasi particle picture. We extended the quasi-particle model to calculate charmonium suppression in an expanding, dissipative strongly interacting QGP medium (SIQGP). We obtained the suppression pattern for charmonium states with respect to the number of participants at mid-rapidity and compared it with the experimental data (CMS JHEP) and (CMS PAS) at LHC energy (Pb+Pb collisions, sNN = 2.76 TeV).

scholarly journals Quarkonium Production in the QGP

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 117
Author(s):  
Alexander Rothkopf
Keyword(s):  
Heavy Ion Collisions ◽  
Open Quantum Systems ◽  
Heavy Ion ◽  
Heavy Quarkonium ◽  
Recent Theory ◽  
Ion Collisions ◽  
Quark Potential ◽  
The One ◽  
Heavy Quark Potential ◽  
Systems Framework

We report on recent theory progress in understanding the production of heavy quarkonium in heavy-ion collisions based on the in-medium heavy-quark potential extracted from lattice QCD simulations. On the one hand, the proper in-medium potential allows us to study the spectral properties of heavy quarkonium in thermal equilibrium, from which we estimate the ψ ′ to J / ψ ratio in heavy-ion collisions. On the other hand, the potential provides a central ingredient in the description of the real-time evolution of heavy-quarkonium formulated in the open-quantum-systems framework.

scholarly journals QUARKONIA IN THE QUARK GLUON PLASMA

2013 ◽  
Vol 28 (11) ◽  
pp. 1340012 ◽  
Author(s):  
ÁGNES MÓCSY ◽  
PÉTER PETRECZKY ◽  
MICHAEL STRICKLAND
Keyword(s):  
Quark Gluon Plasma ◽  
Bound States ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Spectral Functions ◽  
Ion Collisions ◽  
Quark Potential ◽  
Heavy Quark Potential ◽  
Complex Valued

In this paper, we review recent progress toward understanding the nature of quarkonia in the quark gluon plasma. We review the theory necessary to understand the melting of bound states due to color-screening, including lattice results for the heavy quark potential, lattice results on the correlation functions related to the relevant spectral functions, and the emergence of a complex-valued potential in high-temperature quantum chromodynamics. We close with a brief survey of phenomenological models of quarkonium suppression in relativistic heavy ion collisions.

scholarly journals Finite Temperature QCD Sum Rules: A Review

2017 ◽  
Vol 2017 ◽  
pp. 1-24 ◽  
Author(s):  
Alejandro Ayala ◽  
C. A. Dominguez ◽  
M. Loewe
Keyword(s):  
Finite Temperature ◽  
Chemical Potential ◽  
Sum Rules ◽  
Light Quark ◽  
Axial Vector ◽  
Heavy Ion ◽  
Qcd Sum Rules ◽  
Rho Meson ◽  
Ion Collisions ◽  
Rule Method

The method of QCD sum rules at finite temperature is reviewed, with emphasis on recent results. These include predictions for the survival of charmonium and bottonium states, at and beyond the critical temperature for deconfinement, as later confirmed by lattice QCD simulations. Also included are determinations in the light-quark vector and axial-vector channels, allowing analysing the Weinberg sum rules and predicting the dimuon spectrum in heavy-ion collisions in the region of the rho-meson. Also, in this sector, the determination of the temperature behaviour of the up-down quark mass, together with the pion decay constant, will be described. Finally, an extension of the QCD sum rule method to incorporate finite baryon chemical potential is reviewed.

scholarly journals A gauge invariant Debye mass and the complex heavy-quark potential

2016 ◽  
Vol 753 ◽  
pp. 232-236 ◽  
Author(s):  
Yannis Burnier ◽  
Alexander Rothkopf
Keyword(s):  
Heavy Quark ◽  
Gauge Invariant ◽  
Debye Mass ◽  
Quark Potential ◽  
Heavy Quark Potential

scholarly journals Effects of Superstatistics on the Location of the Effective QCD Critical End Point

2019 ◽  
Vol 64 (8) ◽  
pp. 665
Author(s):  
A. Ayala ◽  
M. Hentschinski ◽  
L. A. Hernández ◽  
M. Loewe ◽  
R. Zamora
Keyword(s):  
Phase Diagram ◽  
Chemical Potential ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Chiral Symmetry Restoration ◽  
Interaction Volume ◽  
Qcd Phase Diagram ◽  
End Point ◽  
Ion Collisions ◽  
Effective Description

Effects of the partial thermalization during the chiral symmetry restoration at the finite temperature and quark chemical potential are considered for the position of the critical end point in an effective description of the QCD phase diagram. We find that these effects cause the critical end point to be displaced toward larger values of the temperature and lower values of the quark chemical potential, as compared to the case where the system can be regarded as completely thermalized. These effects may be important for relativistic heavy ion collisions, where the number of subsystems making up the whole interaction volume can be linked to the finite number of participants in the reaction.

DUALITY OF DYNAMICAL AND THERMAL DESCRIPTIONS IN PARTON DISTRIBUTION FUNCTIONS

2011 ◽  
Vol 26 (14) ◽  
pp. 1009-1016 ◽  
Author(s):  
J. CLEYMANS ◽  
G. I. LYKASOV ◽  
A. S. SORIN ◽  
O. V. TERYAEV
Keyword(s):  
Chemical Potential ◽  
Heavy Ion ◽  
Distribution Functions ◽  
Effective Width ◽  
Statistical Distributions ◽  
Free Nucleon ◽  
Parton Distribution Functions ◽  
Ion Collisions ◽  
Temperature Parameter ◽  
Statistical Form

We suggest a duality between the standard (dynamical) and statistical distributions of partons in the nucleons. The temperature parameter entering into the statistical form for the quark distributions is estimated. It is shown that the freeze-out temperature in central heavy-ion collisions at zero chemical potential or the effective width of the energy distribution of pions has a similar value which was estimated in this paper for the valence massless quarks in a free nucleon.

scholarly journals Flow and vorticity with varying chemical potential in relativistic heavy ion collisions

2020 ◽  
Vol 29 (01) ◽  
pp. 2050001
Author(s):  
Abhisek Saha ◽  
Soma Sanyal
Keyword(s):  
Shear Viscosity ◽  
Heavy Ion Collisions ◽  
Collision Energy ◽  
Chemical Potential ◽  
Transport Model ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Viscous Effects ◽  
Ion Collisions ◽  
Lower Collision

We study the vorticity patterns in relativistic heavy ion collisions with respect to the collision energy. The collision energy is related to the chemical potential used in the thermal — statistical models that assume approximate chemical equilibrium after the relativistic collision. We use the multiphase transport model (AMPT) to study the vorticity in the initial parton phase as well as the final hadronic phase of the relativistic heavy ion collision. We find that as the chemical potential increases, the vortices are larger in size. Using different definitions of vorticity, we find that vorticity plays a greater role at lower collision energies than at higher collision energies. We also look at other effects of the flow patterns related to the shear viscosity at different collision energies. We find that the shear viscosity obtained is almost a constant with a small decrease at higher collision energies. We also look at the elliptic flow as it is related to viscous effects in the final stages after the collision. Our results indicate that the viscosity plays a greater role at higher chemical potential and lower collision energies.

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