Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Schwerionenkollisionen und QCD Phasen

HK 44.6: Talk

Thursday, March 22, 2012, 18:00–18:15, P 5

Measurement of the J/ψ inclusive production cross section in pp collisions with ALICE at the LHC — •Jens Wiechula — Physikalisches Institut, Universität Tübingen

The measurement of the J/ψ production cross section in pp collisions is crucial for testing pQCD models of quarkonium production in the new energy regime provided by the LHC. In addition, the cross section in pp is important as reference for the heavy-ion program, for which J/ψ is an essential observable for the deconfined matter.

ALICE measures the J/ψ production at midrapidity (|y|<0.9) in the di-electron channel as well as at forward rapidity (2.5<y<4.0) with a dedicated muon spectrometer. In both channels J/ψ mesons are reconstructed down to zero transverse momentum. This kinematical reach is unique among the LHC experiments.

We will present the rapidity dependence of the inclusive J/ψ production cross section and transverse momentum spectra at a centre of mass energy of √s=7 TeV as well as at √s=2.76 TeV. In addition, polarisation measurements and the contribution of decays from B-hadrons will be addressed.