Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 51: Halbleiterdetektoren III

T 51.9: Vortrag

Mittwoch, 27. März 2019, 18:00–18:15, H03

Timepix3 (TPX3) Luminosity Determination of 13 TeV Proton-Proton Collisions at the ATLAS ExperimentCyprien Beaufort1, Benedikt Bergmann1, Thomas Billoud2, Bartholomej Biskup1, Jan Broulim1,3, Pavel Broulim3, Petr Burian1,3, Davide Caforio1, Erik Heijne1, Petr Fiedler1, Claude Leroy2, Catalina Lesmes Ramierez1, Stanislav Pospisil1, •Andre Sopczak1, Thomas Seidler1, and Michael Suk11Czech Technical University in Prague — 2University of Montreal — 3University of West Bohemia in Pilsen

Medipix and Timepix devices, installed in the ATLAS cavern at LHC, have proved to provide valuable complementary luminosity information. Results are presented from a new measurement network, based on the latest Timepix3 chip. In contrast to previously employed frame-based data acquisition, the TPX3 detector remains active continuously, sending information on pixel hits as they occur. Hit- and cluster-counting methods were used for the luminosity determination of the LHC proton-proton collisions. By counting the number of clusters, instead of just pixel hits, the precision of the luminosity determination could be improved. The LHC luminosity versus time is determined using these two methods, and fitted to a simple model incorporating luminosity reduction from single bunch and beam-beam interactions. The internal precision and long-term time stability of the TPX3 luminosity measurement were determined. The TPX3, owing to its precise time resolution, is able to resolve the time structure of the luminosity due to the collisions of individual LHC proton bunches.

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