Soft electromagnetic radiations from an equilibrating quark-gluon plasma

Pal, Dipali; Mustafa, Munshi G.

doi:10.1103/physrevc.60.034905

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…The models where it is not present are the traditional σωρ models. When the φ is present, we have chosen to call the models as σωρφ models [17,18,[31][32][33].…”

Section: Model Parametersmentioning

confidence: 99%

Hypernuclear matter in a complete SU(3) symmetry group

2014

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Using the well known quantum hadrodynamics (QHD), we study the effects of meson-hyperon coupling constants on the onset of hyperons in dense nuclear matter. We use the SU(3) symmetry group to fix all these coupling constants, constrained to experimental nuclear matter results and astrophysical observations. While the discovery of massive pulsars PSR J1614-2230 and PSR J0348+0432 points towards a very stiff equation of state at very large densities, results from heavy ion collisions point in opposite direction for densities below five times the nuclear saturation density. We study some well known parametrizations and see that most of them cannot satisfy both types of constraints. Indeed, although in our model we can simulate a 2.25 M⊙ hyperonic neutron star, the heavy ion collision constraints limit the maximum mass around 2.06 M⊙.

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“…The models where it is not present are the traditional σωρ models. When the φ is present, we have chosen to call the models as σωρφ models [17,18,[31][32][33].…”

Section: Model Parametersmentioning

confidence: 99%

Hypernuclear matter in a complete SU(3) symmetry group

2014

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The role of gluons in dilepton production from the quark–gluon plasma

Lin

2000

Nuclear Physics A

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We study high mass dilepton production from gluon-induced processes, gq → qγ * , gq →qγ * , and gg → qqγ * , in a thermally equilibrated but chemically under-saturated partonic matter that is expected to be created in the initial stage of ultra-relativistic heavy ion collisions. Regulating the divergence in these processes by the thermal quark mass, we find that gluon-induced processes are more important than the leading-order qq annihilation process as a result of the larger number of gluons than quarks in the partonic matter. The dependence of the thermal dilepton yield from the partonic stage of heavy ion collisions on the initial conditions for the partonic matter is also studied. We further discuss the feasibility of observing thermal dileptons from the quark-gluon plasma in heavy ion experiments.

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Low-mass dilepton rate from the deconfined phase

et al. 2011

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We discuss low mass dilepton rates (≤ 1 GeV) from the deconfined phase of QCD using both perturbative and non-perturbative models and compare with those from lattice gauge theory and in-medium hadron gas. Our analysis suggests that the rate at very low invariant mass (M ≤ 200 MeV) using the nonperturbative gluon condensate in a semiempirical way within the Green function dominates over the Born-rate and independent of any uncertainty associated with the choice of the strong coupling in perturbation theory. On the other hand the rate from ρ − q interaction in the deconfined phase is important between 200 MeV ≤ M ≤ 1 GeV as it is almost of same order of the Born-rate as well as in-medium hadron gas rate. Also the higher order perturbative rate, leaving aside its various uncertainties, from HTL approximation becomes reliable at M ≥ 200 MeV and also becomes comparable with the Born-rate and the lattice-rate for M ≥ 500 MeV, constraining on the broad resonance structures in the dilepton rate at large invariant mass. We also discuss the lattice constraints on the low mass dilepton rate. Furthermore, we discuss a more realistic way to advocate the quark-hadron duality hypothesis based on the dilepton rates from QGP and hadron gas than it is done in the literature.

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Soft electromagnetic radiations from an equilibrating quark-gluon plasma

Cited by 3 publications

References 41 publications

Hypernuclear matter in a complete SU(3) symmetry group

Hypernuclear matter in a complete SU(3) symmetry group

The role of gluons in dilepton production from the quark–gluon plasma

Low-mass dilepton rate from the deconfined phase

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