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T: Fachverband Teilchenphysik

T 120: QCD 2

T 120.1: Gruppenbericht

Donnerstag, 27. März 2014, 16:45–17:05, GFH 01-721

Rapidity gaps in proton-lead collisions with the CMS experiment — •Igor Katkov, Melike Akbiyik, Sebastian Baur, Colin Baus, Hauke Wöhrmann, and Ralf Ulrich — KIT, Karlsruhe, Germany

During 2013 there was for the first time an extended run with asymmetric beams of protons and lead ions at the center of mass energy of 5.02 TeV per nucleon at the LHC. Proton-ion collision data allow to explore the interplay with cosmic ray physics, where the formation of extensive air showers is dominated by collisions of protons with nitrogen or oxygen nuclei. At the highest energies little is experimentally known about diffractive processes, which are crucial for full understanding of many aspects of proton-ion interactions. The presence of large angular regions without hadronic activity, called rapidity gaps, is a characteristic signature of a diffractive process in particle detectors. First results of an analysis of proton-lead collision events with rapidity gaps in the CMS detector are presented and discussed.