Measuring Quark-Gluon-Plasma Thermalization Time with Dileptons

Details Measuring Quark-Gluon-Plasma Thermalization Time with Dileptons Measuring Quark-Gluon-Plasma Thermalization Time with Dileptons

2007-09-22

arxiv.org/abs/0709.3576v3

Phys.Rev.Lett.100:102301,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures; v3: update to match published version

Scientific paper

10.1103/PhysRevLett.100.102301

We calculate the medium dilepton yield from a quark-gluon plasma which has a time-dependent local momentum-space anisotropy. A phenomenological model for the hard momentum scale, p_hard(tau), and plasma anisotropy parameter, xi(tau), is constructed which interpolates between free streaming behavior at early times (tau << tau_iso) and ideal hydrodynamic behavior at late times (tau >> tau_iso). We show that high-energy dilepton production is sensitive to the assumed plasma isotropization time, tau_iso, and can therefore be used to experimentally determine the time of onset for hydrodynamic expansion of a quark-gluon plasma and the magnitude of expected early-time momentum-space anisotropies.

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