EE1: Muon reconstruction in the ATLAS muon spectrometer
Muons play an important role in many studies of the standard model and its possible extensions. In addition to the identification of muons also their momentum and direction of flight are relevant for such analyses. This requires a good calibration and alignment of the many muon detector modules in the muon spectrometer and that this calibration will be continuously monitored and immediately updated in the case of changes. Appropriate calibration data shall be provided within 24 hours after data taking [1] just before these data are used for the reconstruction of the muon trajectories. In order to systematically investigate the behaviour of muon detector modules for the ATLAS experiment a dedicated test setup has been built at LMU (see [2]) where muon from cosmic rays are used to measure the properties of detector modules. Furthermore a calibration computer farm is setup by LMU and MPI which provides the needed computing power for the planned online calibration and alignment of the ATLAS muon spectrometer. For this calibration farm the procedures to calibration and align the ATLAS muon spectrometer have to be developed and to be improved such that a precision of 50 microns can be achieved for the measured points along the track of a single muon.
References:
Muons play an important role in many studies of the standard model and its possible extensions. In addition to the identification of muons also their momentum and direction of flight are relevant for such analyses. This requires a good calibration and alignment of the many muon detector modules in the muon spectrometer and that this calibration will be continuously monitored and immediately updated in the case of changes. Appropriate calibration data shall be provided within 24 hours after data taking [1] just before these data are used for the reconstruction of the muon trajectories. In order to systematically investigate the behaviour of muon detector modules for the ATLAS experiment a dedicated test setup has been built at LMU (see [2]) where muon from cosmic rays are used to measure the properties of detector modules. Furthermore a calibration computer farm is setup by LMU and MPI which provides the needed computing power for the planned online calibration and alignment of the ATLAS muon spectrometer. For this calibration farm the procedures to calibration and align the ATLAS muon spectrometer have to be developed and to be improved such that a precision of 50 microns can be achieved for the measured points along the track of a single muon.
References:
- P. Bagnaia et al.,
Calibration model for the MDT chambers of the ATLAS Muon Spectrometer,
ATLAS Muon Communication ATL-COM-MUON-2008-006, Feb.008, to be published. - O. Biebel et al.,
Test and calibration of large drift tube chambers with cosmic rays,
IEEE Trans. Nucl. Sci. 52 (2005) 2998.
