Flavor dependence of jet quenching in pp collisions and its effect on R AA for heavy mesons

The flavor dependence of the medium modification factor R _pp for pp collisions has been studied for a scenario with formation of a small-size quark-gluon plasma (QGP) for RHIC (√ s = 0.2 TeV) and LHC (√ s = 2.76 TeV) energies. It has been found that at p _T ~ 10 GeV the pion spectrum is suppressed by ~20-30 (25-35)% for RHIC (LHC), for D ( B) mesons the suppression effect is smaller by a factor of ~0.7-0.8 (0.5). The flavor hierarchy R _pp ^π < R _pp ^D < R _pp ^B is held at p _T ≲ 20 GeV for RHIC and at p _T ≲ 70 GeV for LHC. This gives a significant reduction of the heavy-to-light ratios of the nuclear modification factors R _AA as compared to that in the standard scenario without the QGP production in pp collisions.