Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Schwerionenkollisionen und QCD Phasen

HK 44.8: Vortrag

Donnerstag, 22. März 2012, 18:30–18:45, P 5

J/ψ Production as a Function of Charged Particle Multiplicity in pp Collisions at √s = 7  TeV — •Julian Book — Institut für Kernphysik, Goethe-Universität Frankfurt am Main

The investigation of the properties of strongly interacting matter under extreme conditions is the aim of the ALICE experiment. Quarkonia, bound states of heavy (charm or bottom) quarks such as the J/ψ, are expected to be produced in the first hard scattering. Thus they will provide insights into the earliest and hottest stages of collisions where the formation of a Quark-Gluon Plasma is expected.
The measurement of quarkonia in pp collisions will help to understand the production mechanisms of quarkonia in hadronic collisions and give the possibility to test different pQCD production models. At the new energy regime reached by the LHC, the underlying event should be affected by Multi-Parton Interactions (MPI). If the effect of MPI extends to hard processes, a non-trivial dependence of quarkonia production on the charged particle multiplicty might result.
We will present the first measurement of J/ψ production as a function of the charged particle multiplicity in pp collisions at √s = 7  TeV at the LHC.