Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 75: Heavy Ion Collisions and QCD Phases 12
HK 75.3: Vortrag
Freitag, 27. März 2015, 15:15–15:30, T/SR25
Correlation between mean transverse momentum and charged particle multiplicity based on geometrical superposition of p–Pb collisions — •Jerome Jung for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
The mean transverse momentum ⟨ pT ⟩ as a function of
the charged-particle multiplicity Nch in pp, p–Pb and Pb–Pb collisions was recently published by ALICE. While in pp and in p–Pb collisions a strong increase of ⟨ pT ⟩ with Nch is observed, Pb–Pb collisions show a saturation at a much lower ⟨ pT ⟩ .
Efforts of reproducing this behaviour in Pb–Pb with a superpositon of nucleon-nucleon interactions do not succeed. A superposition of p–Pb collisions seems to be more promising, since the p–Pb data shows characteristics of both pp and Pb–Pb collisions.
The geometric distribution of the p–Pb impact parameters is based on the Woods-Saxon density distribution.
Using the correlation of the impact parameter and the multiplicity Nch in p-Pb collisions a multiplicity-spectrum was generated.
Combining this spectrum with experimental p–Pb data we present ⟨ pT ⟩ as a function of Nch in simulated Pb–Pb collisions and compare it to the correlation measured in Pb–Pb by ALICE.