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

Figure 1

Transverse momentum spectra of (with different invariant masses or Feynman variables ) produced by the Drell-Yan process in different collisions at different energies. The data points in (a)–(c) are quoted from the E288 Collaboration [43] and obtained in -Cu collisions at GeV (), 23.8 GeV (), and 27.4 GeV (), respectively. The data points in (d) come from -Cu collisions at GeV performed by the E605 Collaboration [44]. The data points in (e) () and (f) () come from -W collisions at GeV measured by the FNAL-615 Collaboration [45], where the units GeV/ are not shown in (e) due to crowding space. In panel (d), is , and in other panels, 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)

(d)

(e)

(f)