Statistical Behavior of Lepton Pair Spectrum in the Drell-Yan Process and Signal from Quark-Gluon Plasma in High-Energy Collisions

Figure 2

Transverse momentum spectra of (with different invariant masses ) produced by the Drell-Yan process in collisions at (a), 200 (b), and 510 GeV (c). The data points are quoted from the R209 (a) [46], PHENIX (b) [47], and STAR Collaborations (c) [24]. In panels (a) and (b), is . The solid, dashed, and dotted curves are our results of fitting the data points with the convolution of two Lévy-Tsallis functions [Eqs. (2) and (6)], the two-component Erlang distribution [Eq. (4)], and the convolution of two Hagedorn functions [Eqs. (5) and (6)], respectively, see text in subsection 3.3 for the meanings of histograms which are quoted from QCD calculations.

(a)

(b)

(c)