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T: Fachverband Teilchenphysik
T 64: Halbleiterdetektoren: Forschung und Entwicklung 2
T 64.4: Talk
Tuesday, February 28, 2012, 17:30–17:45, ZHG 001
Track Fitting based on Broken Lines for the MU3E Experiment — •Moritz Kiehn, Niklaus Berger, and Andre Schöning — Physikalisches Institut, Universität Heidelberg, Germany
The MU3E project is a recently proposed experiment to search for the lepton flavour changing decay µ → eee. In the Standard Model this decay can occur on the loop-level via neutrino mixing. However, it is highly suppressed with an unobservable branching ratio of < 10−50. An observation would be a clear sign of new physics. In many models for physics beyond the Standard Model the branching ratio is greatly enhanced (up to 10−12).
The current MU3E detector design consists of a electron spectrometer build with four cylindrical layers of thin silicon pixel sensors in a solenoidal magnetic field. The low electron momentum (up to about 53 MeV) makes multiple scattering the biggest source of measurement uncertainty. To reach the required sensitivity, a very high track resolution is required. We investigate a new track fitting algorithm based on broken lines [1], that directly takes scattering angles into account. Results of simulation studies for the fit performance in the MU3E experiment are presented.
[1] V.Blobel, NIM A, 566 (2006), 14-17