Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 65: Detektorsysteme II

T 65.10: Vortrag

Mittwoch, 21. März 2018, 18:50–19:05, Z6 - SR 2.007

Nuclear Interaction Studies with the CMS Tracking Detector — •Melanie Eich and Gregor Kasieczka — Institut für Experimentalphysik, Universität Hamburg

The identification of jets coming from b quarks (b-tagging) is important for many analyses using data from the CMS detector. For b-tagging, among others, the vertex displacement of b quark induced jets is used. Such displaced vertices can also be mimicked by the interaction of hadrons with nucleons of the detector material, so called nuclear interactions. Knowledge about the fraction of misidentified b jets is important and allows to reject these jets. Previous studies of nuclear interactions were done using data recorded in CMS Run I. The study used vertex finding algorithms in combination with truth matching procedures in simulation, to calculate, amongst others, b tag efficiencies of the CSV algorithm. In this talk the status of the nuclear interaction study is presented, using data recorded with the CMS detector in 2017.