Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 69: Myondetektoren I

T 69.3: Talk

Wednesday, March 30, 2011, 17:15–17:30, 30.23: 2-11

Measurement of the performance of the muon reconstruction in ATLAS — •Marco Vanadia, Oliver Kortner, and Hubert Kroha — Max-Planck- Institut für Physik, Foehringer Ring 6, 80805 Muenchen

Final states with muons provide clean signatures for many physics processes at the LHC. The ATLAS detector is optimized for the efficient reconstruction of muons with high momentum resolution. In pp collision data recorded at the LHC, the efficiency of the muon identification can be determined by means of dimuon decays of J/ψ mesons and Z bosons.

The measurements show that the Monte-Carlo prediction of the muon identification efficiency deviates by less than 1% from the measured efficiency. The widths of the dimuon invariant mass spectra at the mass of the J/psi and the Z allow for the measurement of the muon momentum resolution as a function of the transverse momentum. The measured momentum resolution is in agreement with the expectation based on the material distribution in the ATLAS detector and the alignment accuracy of the tracking detectors.