Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 98: Soft QCD und PDF fits

T 98.9: Gruppenbericht

Donnerstag, 12. März 2015, 18:45–19:05, K.11.20 (K5)

Diffraction in proton-ion collisions with the CMS experiment — •Igor Katkov¹, Melike Akbiyik¹, Sebastian Baur¹, Colin Baus¹, Victor Kim², Katerina Kuznetsova², Hauke Wöhrmann¹, and Ralf Ulrich¹ — ¹KIT, Karlsruhe, Germany — ²PNPI, St.Petersburg, Russia

Total inelastic cross section is a fundamental quantity and one of the key parameters characterizing the development of the cascade process in the extensive air showers initiated by cosmic ray particles, mostly protons, colliding with nitrogen or oxygen nuclei. According to the models the different diffractive contributions to the proton-ion cross section in the full phase space add up to around 10% at LHC energies but so far little is known experimentally while sensitivity of the models to diffraction is relatively high. Collisions of protons and lead ions at the centre of mass energy of 5.02 TeV per nucleon at the LHC recorded in 2013 allow for quantitative experimental studies of the process with diffractive topologies. Measurements are performed as a function of the size of the pseudorapidity interval without hadronic activity, rapidity gap, as well as dedicated studies of low mass diffraction are presented and discussed.