Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 95: Pixeldetektoren 5
T 95.2: Vortrag
Mittwoch, 29. März 2017, 17:05–17:20, S 2
Precision Luminosity of LHC Proton-Proton Collisions at 13 TeV Using Hit-Counting with TPX Pixel Devices — •Andre Sopczak1, Babar Ali1, Thanawat Asawatavonvanich1, Jakub Begera1, Benedikt Bergmann1, Thomas Billoud2, Petr Burian1, Davide Caforio1, Ivan Caicedo1, Erik Heijne1, Josef Janecek1, Claude Leroy2, Petr Manek1, Kazuya Mochizuki2, Yesid Mora1, Josef Pacik1, Costa Papadatos2, Michal Platkevic1, Stepan Polansky1, Stanislav Pospisil1, Michal Suk1, and Zdenek Svoboda1 — 1IEAP CTU in Prague — 2University of Montreal
A network of Timepix (TPX) devices installed in the ATLAS cavern measures the LHC luminosity as a function of time as a stand-alone system. The data were recorded from 13 TeV proton-proton collisions in 2015. Using two TPX devices, the number of hits created by particles passing the pixel matrices was counted. A van der Meer scan of the LHC beams was analysed using bunch-integrated luminosity averages over the different bunch profiles for an approximate absolute luminosity normalization. It is demonstrated that the TPX network has the capability to measure the reduction of LHC luminosity with precision. Comparative studies were performed among four sensors (two sensors in each TPX device) and the relative short-term precision of the luminosity measurement was determined to be 0.1% for 10 s time intervals. The internal long-term time stability of the measurements was below 0.5% for the data-taking period.