Phys. Rev. Lett. 71, 3075–3078 (1993)Transverse-mass M⊥ dependence of dilepton emission from preequilibrium and quark-gluon plasma in high energy nucleus-nucleus collisionsReceived 14 June 1993; published in the issue dated 8 November 1993 The dependence on invariant mass M and transverse momentum q⊥ of lepton pairs emitted by quarks during the early stage of central collisions between gold nuclei at √s =200A GeV is investigated within the parton cascade model. For fixed transverse mass M⊥ between 2 and 3 GeV, the spectrum is thermal shaped at low q⊥ and exhibits a power law behavior at larger q⊥. A suspected M⊥ scaling is not observed in the calculated distribution, but the significant shape of the spectrum and the large yield from preequilibrium emission may nevertheless serve as a characteristic signal for a parton plasma formation. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.3075
DOI:
10.1103/PhysRevLett.71.3075
PACS:
25.75.+r, 12.38.Mh, 13.87.Fh, 24.85.+p
See AlsoComment: M. Asakawa, Comment on “Transverse-Mass M⊥ Dependence of Dilepton Emission from Preequilibrium and Quark-Gluon Plasma in High Energy Nucleus-Nucleus Collisions”, Phys. Rev. Lett. 74, 1486 (1995). Reply: K. Geiger, Geiger Replies:, Phys. Rev. Lett. 74, 1487 (1995). |
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