Transverse momentum spectra of dileptons at NA60

Details Transverse momentum spectra of dileptons at NA60 Transverse momentum spectra of dileptons at NA60

2007-01-30

arxiv.org/abs/hep-ph/0701253v1

Phys.Rev.C80:014902,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures

Scientific paper

10.1103/PhysRevC.80.014902

Recently the NA60 collaboration has reported the transverse mass spectra of dimuons coming from In-In collisions at 158 GeV/A. The measured yields display a strong invariant mass dependence not typical of radial flow, suggesting that different sources contribute in different mass regions. We interpret the dimuon transverse mass spectra from an early thermalized partonic phase and hadronic phase constrained by the strictures of broken chiral symmetry. Each phase develops a specific transverse momentum dependence by hydrodynamical expansion. We show that a measurement of the momentum anisotropy at NA60 could provide information on the dominant emission source (hadronic or partonic) in the intermediate mass region 1.5 <= M <= 3.0 GeV.

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