Low-mass dilepton rate from the deconfined phase

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.014908· OSTI ID:21499359

Greiner, Carsten ^[1]; Haque, Najmul ^[2]; Mustafa, Munshi G ^[1]; Thoma, Markus H ^[3]

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1. Institut fuer Theoretische Physik, Johann Wolfgang Goethe University, Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)
2. Theory Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India)
3. Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse, 85748 Garching (Germany)

We discuss low-mass dilepton rates ({<=}1 GeV) from the deconfined phase of QCD using both perturbative and nonperturbative models and compare them 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 approach dominates over the Born rate, independent of any uncertainty associated with the choice of the strong coupling in perturbation theory. On the other hand, the rate from {rho}-q interaction in the deconfined phase is important at 200 MeV {<=}M{<=} 1 GeV as it is almost of same order as the Born rate as well as the in-medium hadron gas rate. Also, the higher order perturbative rate, leaving aside its various uncertainties, from the hard-thermal-loop 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 realistic way to advocate the quark-hadron duality hypothesis based on the dilepton rates from quark-gluon plasma and hadron gas.

• OSTI ID: 21499359
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 1; Other Information: DOI: 10.1103/PhysRevC.83.014908; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

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GLUON CONDENSATION
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HYPOTHESIS
MASS
MEV RANGE 100-1000
PERTURBATION THEORY
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QUARK MATTER
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PARTICLE MODELS
QUANTUM FIELD THEORY