Transverse momentum spectra of dileptons measured by the NA60 Collaboration in In+In collisions at 158 GeV/nucleon
Journal Article
·
· Physical Review. C, Nuclear Physics
- Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800 (United States)
Recently the NA60 Collaboration has reported the transverse mass spectra of dimuons coming from In-In collisions at 158 GeV/nucleon. 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.
- OSTI ID:
- 21290005
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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