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HK: Fachverband Hadronen und Kerne

HK 12: Heavy Ion Collisions and QCD phases

HK 12.5: Talk

Monday, March 16, 2009, 18:00–18:15, H-ZO 10

Suppression of forward dilepton production from an anisotropic QGP — •Mauricio Martinez¹ and Michael Strickland² — ¹Helmholtz Reseach School and FIAS, Ruth-Moufang-Str. 1 60438, Frankfurt am Main, Germany — ²Department of Physics, Gettysburg College, Gettysburg, PA 17325

We calculate the rapidity dependence of leading-order medium dilepton yields resulting from a quark-gluon plasma which has a local time-dependent anisotropy in momentum space. We present a phenomenological model which includes temporal evolution of the plasma anisotropy parameter, ξ, and the hard momentum scale, p_hard. Our model interpolates between 1+1 dimensional collisionally-broadened expansion at early times and 1+1 dimensional ideal hydrodynamic expansion at late times. Using our model, we find that at LHC energies, forward high-energy medium dilepton production would be suppressed by up to a factor of 3 if one assumes an isotropization/thermalization time of 2 fm/c. Therefore, it may be possible to use forward dilepton yields to experimentally determine the time of onset of locally isotropic hydrodynamic expansion of the quark-gluon plasma as produced in ultrarelativistic heavy-ion collisions.