High-energy dileptons from an anisotropic quark-gluon plasma

  • 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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Author:Mauricio Martinez
ArXiv Id:http://arxiv.org/abs/0904.2866v1
Parent Title (German):Vortrag an der Tagung "High-pT Physics at LHC -09" 4 Februar 2009, Prag
Document Type:Article
Date of Publication (online):2009/05/11
Year of first Publication:2009
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Release Date:2009/05/11
Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
Source:arXiv:0904.2866v1 ; Vortrag an der Tagung "High-pT Physics at LHC -09" 4 Februar 2009, Prag
Institutes:Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht