Medium-Modification of Photon-Tagged Jets in AA Collisions

Abstract

We study nuclear modification of the photon-tagged jets in AA collisions within the jet quenching scheme based on the light-cone path integral approach to the induced gluon emission. The calculations are performed for running coupling. Collisional energy loss is treated as a perturbation to the radiative mechanism. We obtain a reasonable agreement with the recent data from the STAR Collaboration on the mid-rapidity nuclear modification factor IAA for Au+Au collisions at √ s = 200 GeV for parametrization of running αs consistent with that necessary for description of the data on suppression of the high-pT spectra.PACS numbers:

Updated analysis of jet quenching at RHIC and LHC within the light cone path integral approach

“…For gluon we account for only g → g transition. We neglect the induced gluon conversion into qq pairs, which for light quarks for RHIC and LHC conditions turns out to be relatively small [94]. At z > 0.5, similarly to the q → q case, we take D in g/g (z) = W(ξ = 1 − z), where now W(ξ) is defined via the one gluon spectrum g → gg.…”

Jet quenching from heavy to light ion collisions

“…We evaluate D in j/k via the induced gluon spectrum dP/dx (x is the gluon fractional momentum) in the approximation of independent gluon emission [39]. A detailed description of the method for evaluation of the induced gluon spectrum within the LCPI formalism and the implementation of the approximation of independent gluon emission for calculation of D in j/k can be found in [11,40].…”