Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 64: Halbleiter 4

T 64.1: Talk

Tuesday, March 25, 2014, 16:45–17:00, P109a

Luminosity Monitoring in ATLAS with MPX Detectors — •Andre Sopczak¹, Babar Ali¹, Nedaa Asbah², Petr Benes¹, Benedikt Bergmann¹, Bartolomej Biskup¹, Michael Campbell³, Erik Heijne¹, Jan Jakubek¹, Edward Kladiva⁴, Claude Leroy², Marzio Nessi³, Stanislav Pospisil¹, Frank Seifert¹, Jaroslav Solc¹, Paul Soueid², Michal Suk¹, Daniel Turecek¹, and Zdenek Vykydal¹ — ¹IEAP CTU in Prague — ²University of Montreal — ³CERN — ⁴IEP SAS Kosice

The ATLAS-MPX detectors are based on the Medipix2 silicon devices designed by CERN for the detection of multiple types of radiation. Sixteen such detectors were successfully operated in the ATLAS detector at the LHC and collected data independently of the ATLAS data-recording chain from 2008 to 2013. Each ATLAS-MPX detector provides separate measurements of the bunch-integrated LHC luminosity. An internal consistency for luminosity monitoring of about 2% was demonstrated. In addition, the MPX devices close to the beam are sensitive enough to provide relative-luminosity measurements during van der Meer calibration scans, in a low-luminosity regime that lies below the sensitivity of the ATLAS calorimeter-based bunch-integrating luminometers. Preliminary results from these luminosity studies are presented for 2012 data taken at √s=8 TeV proton-proton collisions.