scholarly journals Free Energy Evolution and Photon Radiation from QGP

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yogesh Kumar ◽  
S. Somorendro Singh
Keyword(s):  
Free Energy ◽  
Transverse Momentum ◽  
Statistical Model ◽  
Quark Gluon Plasma ◽  
Quark Mass ◽  
Gluon Plasma ◽  
Direct Photon ◽  
Photon Radiation ◽  
Energy Evolution ◽  
Experimental Works

We investigate a simple statistical model of quark-gluon plasma (QGP) formation. In the model, we use a phenomenological parameter which enhances the growth of quark droplet formation and also stabilizes the formation of the QGP droplet. Then, we study direct photon radiation through annihilation and Compton processes from these stabilized QGP incorporating the parametrized momentum factor in the quark mass. The production rate of thermal photon is found to be dominated in the low transverse momentum and increases a little in comparison to the recent development of direct photon radiation of other theoretical and experimental works.

Expansion of Free Energy in the Field of Magnetized Quark–Gluon Plasma

2021 ◽  
pp. 149-155
Author(s):  
Yogesh Kumar ◽  
Poonam Jain ◽  
Sanjeev Kumar ◽  
R. K. Meena ◽  
M. S. Khan
Keyword(s):  
Free Energy ◽  
Quark Gluon Plasma ◽  
Gluon Plasma

scholarly journals Flow and correlation phenomena measurements in pp, pPb and PbPb collisions at CMS

2018 ◽  
Vol 172 ◽  
pp. 05005
Author(s):  
Sandra S. Padula
Keyword(s):  
Transverse Momentum ◽  
Collective Behavior ◽  
Quark Gluon Plasma ◽  
Frictional Resistance ◽  
Gluon Plasma ◽  
High Energy ◽  
Collective Flow ◽  
Particle Correlation ◽  
The Past ◽  
High Energy Collisions

The quark-gluon plasma created in high energy collisions of large nuclei exhibits strong anisotropic collective behavior as a nearly perfect fluid, flowing with little frictional resistance or viscosity. It has been investigated extensively over the past years employing two or more particle correlations. An overview of collective flow and particle correlation measurements at CMS as a function of transverse momentum, pseudorapidity, event multiplicity, for both charged hadrons or identified particles will be presented. These results are compared among pp, pPb and PbPb systems and several aspects of their intriguing similarities are discussed.

scholarly journals A CONSISTENT QUASIPARTICLE PICTURE OF QUARK–GLUON PLASMA AND THE VELOCITY OF SOUND

2006 ◽  
Vol 21 (27) ◽  
pp. 2067-2077 ◽  
Author(s):  
SANJAY K. GHOSH ◽  
TAMAL K. MUKHERJEE ◽  
SIBAJI RAHA
Keyword(s):  
Quark Gluon Plasma ◽  
Quark Mass ◽  
Gluon Plasma ◽  
Velocity Of Sound ◽  
Lattice Data ◽  
Mass Model ◽  
Density Dependent ◽  
Quasiparticle Picture

A thermodynamically consistent density dependent quark mass model has been used to study the velocity of sound in a hot quark–gluon plasma. The results are compared with the recent lattice data.

JET CONVERSIONS IN QGP AND SUPPRESSION OF IDENTIFIED HADRONS

2007 ◽  
Vol 16 (07n08) ◽  
pp. 1930-1936 ◽  
Author(s):  
WEI LIU ◽  
CHE MING KO ◽  
BEN-WEI ZHANG
Keyword(s):  
Transverse Momentum ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
High Transverse Momentum ◽  
Ion Collisions ◽  
Conversion Rates ◽  
Gluon Jets

A gluon or quark jet traversing through a quark-gluon plasma can be converted into a quark or gluon jet through scatterings with thermal partons. Their conversion rates due to two-body elastic and inelastic scattering as well as scatterings involving gluon radiation are evaluated in the lowest order in Quantum Chromodynamics (QCD). Including both energy loss and conversions of quark and gluon jets in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we find a net conversion of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/π+ and [Formula: see text] ratios at high transverse momentum. Using the larger QCD coupling constant from lattice QCD calculations than that given by the perturbative QCD further enhances the net quark to gluon jet conversion rate, leading to a closer similarity between these ratios at high transverse momentum in central Au + Au collisions at [Formula: see text] and in p + p collisions at same energy as observed in experiments.

scholarly journals JET QUENCHING PARAMETER VIA SOFT COLLINEAR EFFECTIVE THEORY (SCET)

2011 ◽  
Vol 20 (07) ◽  
pp. 1610-1615 ◽  
Author(s):  
FRANCESCO D'ERAMO ◽  
HONG LIU ◽  
KRISHNA RAJAGOPAL
Keyword(s):  
Transverse Momentum ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Jet Quenching ◽  
Effective Theory ◽  
Strongly Coupled ◽  
Expectation Value ◽  
Soft Collinear Effective Theory ◽  
Strongly Coupled Plasma ◽  
The Fourier Transform

We analyze the transverse momentum broadening in the absence of radiation of an energetic parton propagating through quark-gluon plasma via Soft Collinear Effective Theory (SCET). We show that the probability for picking up transverse momentum k⊥ is given by the Fourier transform of the expectation value of two transversely separated light-like path-ordered Wilson lines. The subtleties about the ordering of operators do not change the [Formula: see text] value for the strongly coupled plasma of [Formula: see text] SYM theory.

PION ELLIPTIC FLOW AND HBT INTERFEROMETRY IN A GRANULAR QUARK-GLUON PLASMA DROPLET MODEL

2007 ◽  
Vol 16 (07n08) ◽  
pp. 1832-1838
Author(s):  
WEI-NING ZHANG ◽  
YAN-YU REN ◽  
CHEUK-YIN WONG
Keyword(s):  
Transverse Momentum ◽  
Velocity Distribution ◽  
Quark Gluon Plasma ◽  
Elliptic Flow ◽  
Gluon Plasma ◽  
Droplet Model ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
Hbt Interferometry

We use a model of quark-gluon plasma granular droplets that evolve hydrodynamically to investigate pion elliptic flow and Hanbury–Brown–Twiss interferometry. We find that the data of pion transverse momentum spectra, elliptic flows, and HBT radii in [Formula: see text] Au + Au collisions at RHIC can be described well by an expanding source of granular droplets with an anisotropic velocity distribution.

scholarly journals Perturbative QCD at High Temperature

1997 ◽  
Vol 12 (08) ◽  
pp. 1431-1464 ◽  
Author(s):  
Agustin Nieto
Keyword(s):  
Field Theory ◽  
Free Energy ◽  
Perturbation Theory ◽  
High Temperature ◽  
Perturbative Qcd ◽  
Effective Field Theory ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Effective Field ◽  
Recent Developments

Recent developments of perturbation theory at finite temperature based on effective field theory methods are reviewed. These methods allow the contributions from the different scales to be separated and the perturbative series to be reorganized. The construction of the effective field theory is shown in detail for ϕ4 theory and QCD. It is applied to the evaluation of the free energy of QCD at order g5 and the calculation of the g6 term is outlined. Implications for the application of perturbative QCD to the quark–gluon plasma are also discussed.

Photon production in high energy nuclear collision of quark–gluon plasma

2014 ◽  
Vol 29 (22) ◽  
pp. 1450110 ◽  
Author(s):  
S. Somorendro Singh ◽  
Yogesh Kumar
Keyword(s):  
Quark Gluon Plasma ◽  
Quark Mass ◽  
Gluon Plasma ◽  
High Energy ◽  
Photon Production ◽  
Nuclear Collision ◽  
Current Observation ◽  
Direct Photon Production ◽  
Photon Spectra ◽  
High Energy Nuclear Collision

We extend to investigate photon production through annihilation with scattering (AWS), and Compton and annihilation processes from a stabilized high energy nuclear collision of quark–gluon plasma (QGP) incorporating finite value of quark mass obtained through a strong coupling value. The production rate is represented in the region of low and intermediate photon energy and it is observed to be a decreasing function with temperature. The calculation is extended to the case of photon spectra with the photon transverse momentum. The current observation shows little enhancement in both processes at the temperature T = 0.25 GeV and it is in conformity with the recent direct photon production of other works at temperature T = 0.30 GeV .

scholarly journals Hard-thermal-loop resummation of the free energy of a quark-gluon plasma

2000 ◽  
Vol 61 (7) ◽  
Author(s):  
Jens O. Andersen ◽  
Eric Braaten ◽  
Michael Strickland
Keyword(s):  
Free Energy ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Hard Thermal Loop

scholarly journals Transverse momentum broadening of a jet in quark-gluon plasma: an open quantum system EFT

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Varun Vaidya ◽  
Xiaojun Yao
Keyword(s):  
Field Theory ◽  
Transverse Momentum ◽  
Master Equation ◽  
Effective Field Theory ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Effective Field ◽  
Jet Quenching ◽  
Jet Substructure ◽  
Open Quantum

Abstract We utilize the technology of open quantum systems in conjunction with the recently developed effective field theory for forward scattering to address the question of massless jet propagation through a weakly-coupled quark-gluon plasma in thermal equilibrium. We discuss various possible hierarchies of scales that may appear in this problem, by comparing thermal scales of the plasma with relevant scales in the effective field theory. Starting from the Lindblad equation, we derive and solve a master equation for the trans- verse momentum distribution of a massless quark jet, at leading orders both in the strong coupling and in the power counting of the effective field theory. Markovian approximation is justified in the weak coupling limit. Using the solution to the master equation, we study the transverse momentum broadening of a jet as a function of the plasma temperature and the time of propagation. We discuss the physical origin of infrared sensitivity that arises in the solution and a way to handle it in the effective field theory formulation. We suspect that the final measurement constraint can only cut-off leading infrared singularities and the solution to the Markovian master equation resums a logarithmic series. This work is a stepping stone towards understanding jet quenching and jet substructure observables on both light and heavy quark jets as probes of the quark-gluon plasma.

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