Energy distributions of dimuons and diphotons in relativistic heavy ion collisions

Dimuon and Diphoton Emission from Quark-Gluon Plasma in High-Energy Heavy-Ion Collisions: Effects of Longitudinal Flow

“….. 20). Namely, the emission of pairs from the QGP with large invariant mass of about 5GeV is more active than that from the RG; furthermore in this region the dimuon emission from the RG is strongly suppressed because of the presence of the pion form-factor 22 ) (2'6).…”

“…20) replacing the variables (El , E 2) by (Cl, C2). It owes the rapidity-independence in the energy-tof) distribution.…”

Energy distribution of muon pairs: A signal for the creation of a baryon-rich quark-gluon plasma in relativistic heavy-ion collisions

“…From Ref. [12] we get the following relations (Q=QGP, H = H R G , MP=muon pairs, and P P = photon pairs):…”

“…2 ~e V / f m~) are taken from our earlier papers [9,13]. The total contribution to the pair production rate is given by Following Yoshida [12], we also consider the pairs of particles which are collinearly produced in the transverse direction. In other words, the detectors are assumed to be opposite to each other in the plane perpendicular to the ion-beam axis in the center of the ion-momentum frame.…”

“…Hirasawa et al [ l l ] have studied the angular distribution of muon pairs and photon pairs and pointed out the superiority of the photon pair data. Recently, Yoshida [12] has calculated the energy distribution of muon pairs and photon pairs and found that an analysis of the muon pair data is easier than that of photon pairs for distinguishing between the Q G P phase and the hadronic phase.…”