Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 14: Starke Wechselwirkung (Experiment) I
T 14.5: Talk
Monday, February 29, 2016, 12:00–12:15, VMP8 SR 206
Observation of soft diffraction with rapidity gaps in the CASTOR calorimeter of CMS — •Melike Akbiyik, Colin Baus, Sebastian Baur, Igor Katkov, Ralf Ulrich, and Hauke Woehrmann — Karlsruhe Institute of Technology, Karlsruhe, Germany
Observation of soft diffractive dissociation in pp collisions of LHC Run2 at √s=13 TeV are presented in kinematics regions defined by the masses MX and MY of the two final state hadronic systems separated by the largest rapidity gap in the event. Differential cross sections are obtained as a function of ξX=MX2/s. Two samples are distinguished depending on their masses MX and MY, one dominated by single dissociation (SD), and other one dominated by double dissociation (DD). The CASTOR calorimeter allow us to detect the hadronic system of the mass MY when it escapes the central detector. The activity (or lack of it) in CASTOR enables to distinguish a SD event from a DD event. The calibration of CASTOR is done using beam halo muon is introduced. Analysis of the obtained muon spectra provides relative response to a muon for each individual read-out channel.