Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Schwerionenkollisionen und QCD Phasen

HK 41.4: Talk

Thursday, March 20, 2014, 15:00–15:15, HZ 6

Neutral meson measurement via photon conversions in p-Pb collisions at √s_NN= 5.02 TeV with ALICE at the LHC — •Annika Passfeld for the ALICE collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Germany

The measurement of particle production in p-Pb collisions at high LHC energies allows the study of fundamental properties of quantum chromodynamics (QCD) at low parton momentum fraction x and high gluon densities. Moreover it is important as reference for heavy ion collisions. It can show whether the initial state of the colliding nuclei plays a role in the observed suppression of hadron production at high p_T in Pb-Pb collisions. The measurement of neutral pions has the advantage of large statistics of identified particles over a relatively large transverse momentum range. In addition, the neutral pion measurement is crucial for the background determination for other analyses like the direct photon measurement.

In this talk the current status of the π⁰ → γ γ and η → γ γ analysis using photon conversions will be presented. Differential invariant cross sections for minimum bias collisions and for different charged particle multiplicities will be shown for both mesons as well as R_p−Pb for the neutral pions.