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T: Fachverband Teilchenphysik
T 89: Experimentelle Methoden 3
T 89.2: Vortrag
Mittwoch, 29. März 2017, 17:00–17:15, JUR 253
Track Based Alignment for the Mu3e Detector — •Ulrich Hartenstein for the Mu3e collaboration — JGU Mainz
The Mu3e experiment searches for the lepton flavor violating decay µ
→ e+e−e+ with a sensitivity goal for the branching fraction of
better than 10−16. This process is heavily supressed in the standard
model of particle physics (BR < 10−50) which makes an observation
of this decay a clear indication of new physics.
For track reconstruction, four barrel shaped layers consisting of
about 3000 high-voltage monolithic
active pixel sensors (HV-MAPS) are used. The position, orientation and possible deformations of these
sensors must be known to greater precision than the assembly tolerances.
A track based alignment via the General Broken Lines fit and
the Millepede-II algorithm will be used to achieve this precision in the
final detector.
The talk will discuss preparations for aligning the detector using a detailed
simulation. A set of alignment parameters that not only describe the position
and rotation but also deformations of individual pixel sensors will be introduced.
An alignment for these kind of parameters is - due to the very thin (50µ m) pixel sensors - essential for the Mu3e detector.