Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Schwerionenkollisionen und QCD Phasen
HK 4.5: Vortrag
Montag, 17. März 2014, 15:15–15:30, HZ 6
Jet reconstruction with background subtraction in a partonic transport model — •Florian Senzel1, Jan Uphoff1, Oliver Fochler1, Zhe Xu2, and Carsten Greiner1 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität Frankfurt, Germany — 2Department of Physics, Tsinghua University, Beijing, China
Experimental data measured in √s=2.76 ATeV Pb+Pb collisions by the LHC experiments showed a significant imbalance in the transverse momenta of the two reconstructed jets with the highest transverse momenta. This momentum imbalance is assumed to be caused by the different in-medium path lengths and thereby different energy and momentum loss of the di-jets within the dense medium. To investigate this momentum loss we extended the transport model BAMPS which solves the full 3+1D Boltzmann equation for partons based on pQCD cross sections. One feature of BAMPS is the stochastic modeling of both 2→2 and 2↔3 scattering processes by employing a new, improved Gunion-Bertsch matrix element. We will show our results for the momentum asymmetry AJ using well-established experimental subtraction methods and have a closer look at the role of further recoil scattering processes of the initial shower partons on the momentum loss of the reconstructed jets. Thereby we will emphasize that for this investigation a careful consideration of the subtraction of the soft underlying background medium becomes crucial.
Supported by HGS-HIRe.