Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 11: QCD / Partonstruktur

T 11.3: Talk

Monday, March 19, 2018, 16:30–16:45, Z6 - SR 1.002

Measurement of the diffractive cross sections with the CMS experiment at 13TeV — •Melike Akbiyik, Ralf Ulrich, and Sebastian Baur — KIT, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

The cross section for single and double diffractive processes is measured at the CERN LHC with the CMS experiment in proton-proton collisions at 13TeV. The CASTOR calorimeter is a crucial part of the analysis, since it is suited to distinguish between single and double diffraction. A multivariate classification with BDTs is employed for the core task. As input serve pixel tracks (with no magnetic field in CMS) combined with towers from all calorimeters, covering the enormous continuous acceptance from -6.6<eta<+5.2. The results are the first measurements of diffractive cross sections at 13TeV so far. The data challenges some of the model predictions, and favors smaller values of single diffraction towards the highest energies.