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.
| Author: | Mauricio Martinez |
|---|---|
| URN: | urn:nbn:de:hebis:30-66016 |
| 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 |
| Language: | English |
| Date of Publication (online): | 2009/05/11 |
| Year of first Publication: | 2009 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Release Date: | 2009/05/11 |
| Note: | 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 |
| HeBIS-PPN: | 214037061 |
| 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): |  Deutsches Urheberrecht |
