Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 74: Heavy Ion Collisions and QCD Phases 11
HK 74.2: Talk
Friday, March 27, 2015, 15:00–15:15, T/SR14
The quark-gluon plasma within a partonic transport approach — •Florian Senzel1, Oliver Fochler1, Jan Uphoff1, Zhe Xu2, and Carsten Greiner1 — 1Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 2Tsinghua University, Beijing 100084, China
Aiming for the simultaneous description of the hard and the soft regime of ultra-relativistic heavy-ion collisions, the partonic transport approach BAMPS (Boltzmann Approach to Multi-Parton Scatterings) simulates microscopically the quark-gluon plasma by perturbative quantum chromodynamics. To this end, it numerically solves the 3+1D Boltzmann equation by allowing interactions among all parton species: both elastic 2 → 2 and inelastic 2 ↔ 3 processes for gluons as well as quarks. For the inelastic collisions, we employ the improved Gunion-Bertsch matrix element, which cures problems of the original Gunion-Bertsch result in characteristic regions of the phase space. Based on extensive numerical calculations, the improved matrix element agrees well with the exact pQCD calculation. By employing the improved GB matrix element together with a running coupling evaluated at the microscopic scale, we present results for the suppression of high pt particles as well as the collectivity of the bulk medium and compare them to LHC data of the nuclear modification factor RAA and the elliptic flow v2. Furthermore, we present studies of RAA for different hadron species, the elliptic flow v2 at high transverse momentum and the momentum loss of reconstructed jets.