München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Kalorimeter 3

T 62.3: Talk

Wednesday, March 11, 2009, 17:15–17:30, A016

Cosmic Ray Muon Timing and Sources of Fake Missing Transverse Energy in ATLAS — •Bernhard Meirose — Physikalisches Institut, University of Freiburg

Cosmic ray muons analysis is a crucial step in the commissioning of the ATLAS detector. In this work we used cosmic ray data for timing studies in the ATLAS Hadronic Tile Calorimeter (TileCal). Analysing time-of-flight distributions from cosmic muons between two modules of TileCal we crosschecked inter-module time offsets obtained in LASER run studies, showing that in a few cases previous results could be further improved. Using new cuts at the cell level we also showed how this analysis can be used for enhancing the signal-to-noise ratio. On the second part of our study we use cosmic ray muon data recorded with the ATLAS calorimeters and studied several sources of fake missing transverse energy in the calorimeter systems, including electronics noise. Methods to reject this background using calorimeter timing have been explored on simulated jet events, simulated cosmic ray events, and real cosmic ray data. Further rejection of in-time cosmic ray events has been studied with a simulated SUSY signal and compared to real cosmic ray data.