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T: Fachverband Teilchenphysik
T 98: Soft QCD und PDF fits
T 98.6: Talk
Thursday, March 12, 2015, 18:00–18:15, K.11.20 (K5)
Measurement of the proton–proton total cross section at √s = 7 TeV via elastic scattering with the ALFA sub-detector of ATLAS at the LHC — •Kristof Kreutzfeldt, Michael Düren, Christian Heinz, and Hasko Stenzel — 2. Physikalisches Institut, Universität Gießen
The ALFA (Absolute Luminosity for ATLAS) detector is one of the ATLAS forward detectors located about 240 m away from the interaction point in the LHC tunnel. ALFA is a scintillating fibre tracking detector housed in Roman pots and designed to measure elastic proton-proton scattering up to the smallest scattering angles.
In 2011 data were taken at a centre-of-mass energy of √s = 7 TeV during a special low intensity fill of LHC with high β* = 90 m beam optics. Results of the measurement of the differential elastic cross section dσ/dt, the total cross section σtot, the nuclear slope B and other derived quantities will be presented in this talk. In the analysis the luminosity determination, the fine tuning of beam optics parameters and a data-driven method to determine the reconstruction efficiency are emphasized.