By Ian R. Kenyon
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R C P ratios for ^/SJVJV — 200 GeV Au + Au collision data measured in STAR. o. §.. I 5 6 7 pT (GeV/c) Figure 11. R C P ratios for yijviv = 200 GeV Au + Au collision data measured in PHENIX. 2. Charm and Beauty Hadrons Heavy (charm and beauty) quarks are expected to lose less energy while propagating through a dense colored medium. The large heavy quark mass reduces the available phase space for gluon radiation. 44 PHENIX and STAR have measured the spectra of non-photonic electrons in TJSNN — 200 GeV p + p and Au + Au collisions over a range of impact parameters.
However, this has proved another educational example of MC predictions being the limiting factor. We do not have a control sample, but depend on SM predictions, largely Wj and Zj. We have 2 MC generators- 23 Figure 21. The distributions in photon and lepton E T , E T > and 3-body transverse mass from the CDF i ^ t search in 305 p b " 1 . 10 20 30 40 50 60 70 80 90 100 Photon ET[GeV] Figure 22. Comparison of the E T spectrum of isolated photons in Drell-Yan+7 from MadGraph (red) and Baur (black) MC generators.
Curves 2 (a and b) are for various values of the gluon density of the medium (1000 and 3500). Clearly only curve lc approximates what is seen in the data, but this curve does not include B-meson decays that become important above about 3 GeV/c. In Fig. 13 the parameters for transverse momentum squared labeled "Armesto" from Ref. 47 and gluon density labeled DVGL from Refs. 48 ' 49 for the calculations are listed in the legend. The curve labeled "DVGLR" corresponds to calculations including induced gluon radiation, while those labeled "DVGL-R+EL" correspond to gluon radiation and elastic scattering energy loss.