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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Physik mit schweren Ionen

HK 19.5: Talk

Tuesday, March 13, 2007, 18:00–18:15, F

Dilepton production from an anisotropic quark gluon plasma — Adrian Dumitru¹, Michael Strickland², and •Mauricio Martinez³ — ¹Institut für Theoretische Physik, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany — ²Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany — ³Helmholtz Research School, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany

We calculate the leading-order dilepton production resulting from the annihilation process qq → l⁺ l⁻ assuming a quark-gluon plasma which is anisotropic in momentum space. Such momentum-space anisotropies are generated by the rapid longitudinal expansion of the initial pre-hadronic fireball. Although hydrodynamic models assume fast isotropization, there is currently no independent way to determine the level of anisotropy experimentally. Due to their weak interaction with the surrounding matter electromagnetic observables, such as dilepton production provide an ideal tool for determining such information.