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Sep 20, 2013
09/13

by
S. S. Singh; Agam K. Jha

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We study the electromagnetic radiation from a hot and slightly strong interacting fireball system of quark-gluon plasma using the Boltzmann distribution function for the incoming particles and Bose-Einstein distribution for gluon in first calculation of electromagnetic radiation and Fermi-Dirac distribution for quark, antiquark and Boltzmann distribution for gluon in our second calculation. The thermal photon emission rate is found that it is infrared divergent for massless quarks which are...

Source: http://arxiv.org/abs/hep-ph/0607328v1

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Sep 20, 2013
09/13

by
S. S. Singh; Agam K. Jha

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A model of cut-off momentum distribution functions in a Quark Gluon Plasma with finite baryon chemical potential is discussed. This produces a quark gluon plasma signature in Ultra Relativistic Nuclear Collisions with a specific structure of the dilepton spectrum in the transverse momentum region of $(1-4)~GeV$ and the dilepton production rate is found to be a strong decreasing function of the chemical potential.

Source: http://arxiv.org/abs/hep-ph/0607005v1

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Sep 22, 2013
09/13

by
R. Ramanathan; Agam K. Jha; S. S. Singh

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We propose an algebraic form for the density of states of quarks and gluons in a Quark-Gluon Plasma (QGP) fireball in quasi-equilibrium with a hadronic medium as $\rho(k)= \frac {\alpha}{k} + {\beta}k + {\delta}k^{2}$, and determine the parameters $\alpha$, $\beta$ and $\delta$ using Lattice Gauge results on the velocity of sound in QGP. The behaviour of the resulting $\rho(k)$ can be easily compared with the thermodynamic data on QGP that is expected from LHC and other RHIC experiments. Our...

Source: http://arxiv.org/abs/1103.5049v1

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119

Jul 20, 2013
07/13

by
R. Ramanathan; Y. K. Mathur; K. K. Gupta; Agam K. Jha

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We construct the density of states for quarks and gluons using the `Thomas - Fermi model' for atoms and the `Bethe model' for nucleons as templates. With parameters to take care of the plasma (hydrodynamical) features of the QGP with a thermal potential for the interaction, we find a window in the parametric space of the model where observable QGP droplets of $ \sim $ 5 fm radius can occur with transition temperature in the range 140 MeV to 250 MeV. By matching with the expectations of Lattice...

Source: http://arxiv.org/abs/hep-ph/0406092v1

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Jul 24, 2013
07/13

by
S. Somorendro Singh; D. S. Gosain; Yogesh kumar; Agam K. Jha

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The free energy of a Quark-Gluon Plasma fireball in the hadronic medium is calculated in the Ramanathan et al. statistical model including the effect of curvature. The result with this curvature is found to produce significant improvement from earlier results in all the parameters we calculated. The surface tension with this curvature effect is found to be $ 0.17 T_{c}^{3}$, which is two times the earlier value of surface tension which is $ 0.078 T_{c}^{3} $, and it is nearly close to the...

Source: http://arxiv.org/abs/0807.4827v1

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Sep 21, 2013
09/13

by
R. Ramanathan; Y. K. Mathur; K. K. Gupta; Agam K. Jha

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We propose a simple statistical model for the density of states for quarks and gluons in a QGP droplet, making the Thomas-Fermi model of the atom and the Bethe-model for the nucleons as templates for constructing the density of states for the quarks and gluons with due modifications for the `hot' relativistic QGP state as against the `cold' non-relativistic atom and nucleons, which were the subject of the earlier `forebears' of the present proposal.We introduce `flow-parameters' $\gamma_{q,g}$...

Source: http://arxiv.org/abs/hep-ph/0402272v1

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Sep 20, 2013
09/13

by
R. Ramanathan; Agam k. Jha; K. k. Gupta; S. S. Singh

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We study the effect of finite chemical potential for the QGP constituents in the Ramanathan et al. statistical model (Phys.Rev.C70, 027903,2004). While the earlier computations using this model with vanishing chemical potentials indicated a weakly first order phase transition for the system in the vicinity of 170 MeV (Pramana, 68, 757, 2007), the introduction of finite values for the chemical potentials of the constituents makes the transition a smooth roll over of the phases, while allowing...

Source: http://arxiv.org/abs/0802.2433v1

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Sep 23, 2013
09/13

by
R. Ramanathan; Agam K. Jha; S. S. Singh; K. K. Gupta

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Thermal and interfacial properties of a QGP droplet in a hadronic medium are computed using a statistical model of the system. The results indicate a weakly first order transition at a transition temperature \sim (160 \pm 5) MeV. The interfacial surface tension is proportional to the cube of the transition temperaure irrespective of the magnitude of the transition temperature. The velocity of sound in the QGP droplet is predicted to be in the range (0.27 \pm 0.02) times the velocity of light in...

Source: http://arxiv.org/abs/hep-ph/0510196v2

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Sep 19, 2013
09/13

by
R. Ramanathan; Agam K. Jha; K. K. Gupta; S. S. Singh

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We study the phase structure of the QGP-Hadron system under quasi-static equilibrium using the Ramanathan et al. statistical model for the QGP fireball formation in a hadronic medium. While in the earlier published studies we had used the Peshier effective potential which is appropriate for the deconfined QGP phase but could be extrapolated to the transition region from the higher momentum regime, in this paper we study the same system using the Cornell and Richardson potentials which are more...

Source: http://arxiv.org/abs/0909.3683v1

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Sep 18, 2013
09/13

by
R. Ramanathan; Y. K. Mathur; K. K. Gupta; Agam K. Jha; S. S. Singh

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A Comparative study of the strengths and weakness of the models of fireball formation namely the statistical model of Ramanathan et.al (Physical Review C 70, 027903, 2004) and the approximation schemes of Kapusta et. al (Physical Review D 46, 1379, 1992) and its subsequent improved variants is made. The way to complement the various approximation schemes, in order to enhance their utility in the phenomenological analysis of QGP data that are expected from ongoing URHIC experiments, is...

Source: http://arxiv.org/abs/hep-ph/0502046v3