Low Mass Dimuons Produced in Relativistic Nuclear Collisions

Details Low Mass Dimuons Produced in Relativistic Nuclear Collisions Low Mass Dimuons Produced in Relativistic Nuclear Collisions

2007-06-13

arxiv.org/abs/0706.1934v3

Phys.Rev.Lett.100:162301,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, updated hadronic analysis

Scientific paper

10.1103/PhysRevLett.100.162301

The NA60 experiment has measured low-mass muon pair production in In-In collisions at 158 A GeV with unprecedented precision. We show that this data is reproduced very well by a dynamical model with parameters scaled from fits to measurements of hadronic transverse mass spectra and Hanbury-Brown and Twiss correlations in Pb-Pb and Pb-Au collisions at the same energy. The data is consistent with in-medium properties of $\rho$ and $\omega$-mesons at finite temperature and density as deduced from empirical forward-scattering amplitudes. Inclusion of the vacuum decay of the $\rho$-meson after freeze-out is necessary for an understanding of the mass and transverse momentum spectrum of dimuons with $M \apprle 0.9 {\rm GeV}/c^2$.

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