Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 112: Silicon trackers 5
T 112.5: Talk
Friday, March 8, 2024, 10:00–10:15, Geb. 30.22: kl. HS A
Two layers simulations for a modified Phase I of the Mu3e experiment — •Eloy Huidobro Rodriguez for the Mu3e collaboration — Physikalisches Institut, Heidelberg, Germany — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The Mu3e experiment at the PSI aims to observe the decay µ+ → e+e−e+ with a single event sensitivity of 2· 10−15 on the branching fraction in phase I. Measuring this decay, which violates lepton flavour conservation, would be a clear sign of new physics, as it is suppressed to unobservable orders in the SM.
Since the two outer pixel tracking layers of the experiment will not be ready for the beamtime in 2024, the performance of a setup consisting of only two inner pixel layers surrounding the stopping target is studied. The absence of the outer tracking layers causes an increase in fake rate due to a loss of redundancy in the track reconstruction, as well as a loss of acceptance and momentum resolution. To overcome these negative effects, it is necessary to reduce the muon stopping rate and increase the magnetic field for this setup. The lower muon stopping rate reduces the hit occupancy and thus the fake rate, while the larger magnetic field increases the rate of recurling tracks in the inner layers and increases the momentum resolution. Results from a simulation study are presented for different magnetic field strengths and a tailored track reconstruction based on recurling tracks measured in only two tracking layers. The achievable sensitivities for different magnetic field configurations are compared.
Keywords: lepton flavour violation; new physics; HV-MAPS