Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Schwerionenkollisionen und QCD Phasen VIII

HK 64.1: Gruppenbericht

Freitag, 25. März 2011, 14:00–14:30, HS1

Measurement of the J/ψ Production Cross Section in pp Collisions at √s=7 TeV with ALICE at the LHC and Perspectives for PbPb Collisions — •Frederick Kramer¹, Ionut Arsene², Christoph Blume³, Julian Book¹, Anton Andronic², WooJin J. Park², and Jens Wiechula⁴ — ¹University of Frankfurt — ²GSI Darmstadt — ³University of Heidelberg — ⁴University of Tübingen

ALICE is the dedicated heavy-ion physics experiment at the Large Hadron Collider (LHC). It is designed to provide excellent capabilities to study the Quark-Gluon Plasma (QGP), the deconfined state of strongly-interacting matter, in the highest energy density regime opened up by the LHC. Quarkonia, bound states of heavy (charm or bottom) quarks such as the J/ψ, are crucial probes of the QGP. An essential baseline for measurements in AA collisions is high-precision data from pp collisions. Moreover, measurements in pp in the new energy domain of the LHC serve as a crucial test for competing models of quarkonium hadroproduction.

We will present first results of rapidity and transverse momentum distributions of the inclusive J/ψ production cross section. The analysis is based on the reconstruction of the channel J/ψ→e⁺e⁻ using the central barrel detectors of ALICE. Furthermore, the status of the corresponding analysis in PbPb collisions will be given.