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T: Fachverband Teilchenphysik
T 79: Experimental methods IV
T 79.5: Vortrag
Donnerstag, 2. April 2020, 17:30–17:45, H-ÜR 1
Bunch pattern dependency of the track counting luminosity measurement in the ATLAS experiment — •Paul Moder1,2, Valerie Lang2, Beate Heinemann1,2, and Claudia Seitz1 for the ATLAS collaboration — 1DESY Hamburg — 2Albert-Ludwigs-Universität Freiburg
The measurement of the integrated luminosity, delivered to the ATLAS experiment by the Large Hadron Collider (LHC) at CERN is a key parameter for every physics analysis. It describes the number of particle collisions over a certain time and area, and combined with the cross section, it can be used to predict the expected production rates for a particular process. The uncertainty in the luminosity measurement therefore plays an important role for the precision of physics analyses in ATLAS.
One of the methods for measuring the luminosity is called track counting. For this method, the reconstructed charged particle tracks in the ATLAS Inner Detector are counted where the average over several crossings of proton bunches is proportional to the number of simultaneous interactions µ and therefore the luminosity for a dedicated track selection. One challenge of the method, however, is the dependence on the pattern of proton bunches, which usually consists of trains - a number of consecutive filled bunches - and individual bunches with larger gaps in between. In this presentation, the studies of the dependency of the track counting luminosity measurement on the bunch position will be shown.