Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-04-18
PoS High-pTphysics09 2009:049,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 5 figures, talk given at the 4th international workshop on High-pT Physics at the LHC 09, February 4-7 2009, Prague,
Scientific paper
We calculate leading-order dilepton yields from a quark-gluon plasma which has a time-dependent anisotropy in momentum space. Such anisotropies can arise during the earliest stages of quark-gluon plasma evolution due to the rapid longitudinal expansion of the created matter. A phenomenological model for the proper time dependence of the parton hard momentum scale, p_hard, and the plasma anisotropy parameter, xi, is proposed. The model describes the transition of the plasma from a 0+1 dimensional collisionally-broadened expansion at early times to a 0+1 dimensional ideal hydrodynamic expansion at late times. We find that high-energy dilepton production is enhanced by pre-equilibrium emission up to 50% at LHC energies, if one assumes an isotropization/thermalization time of 2 fm/c. Given sufficiently precise experimental data this enhancement could be used to determine the plasma isotropization time experimentally.
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