Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 105: Suche nach neuen Teilchen 6

T 105.3: Vortrag

Donnerstag, 30. März 2017, 17:15–17:30, JUR 5

Calibration of the ATLAS Muon Spectrometer for time-of-flight measurements targeting searches for long-lived particles — •Jochen Jens Heinrich and Sascha Mehlhase — Ludwig-Maximilians-Universität, München, Deutschland

Many theories beyond the Standard Model predict the existence of new long-lived heavy charged particles that can be produced in LHC proton–proton collisions at √s=13 TeV. If their lifetimes are large enough to enable them to traverse large parts of the detector before decaying, we speak of stable massive particles (SMPs). SMPs do not form extensive showers in the calorimeters and therefore present the signature of a muon-like particle that propagates with velocities much slower than the speed of light. A direct search for SMPs can be conducted, where the signature is largely model independent with only a small instrumental background. It also expands coverage in new-particle searches, as it is an orthogonal approach to generic missing-energy based searches for new physics. SMPs are identified by determining their velocity via measurement of their anomalous ionisation energy losses in the inner tracker and time-of-flight measurements carried out in the calorimeter and muon system. All involved subsystems require extensive calibration. The status of a search effort for stable supersymmetric particles in the dataset collected in 2015 and 2016 corresponding to 36.5fb⁻¹ is presented. Special emphasis is given to the timing calibration process of the Muon Spectrometer, which involves a series of dedicated corrections that account for time-dependent effects as well as disparities between individual detector components.