Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 67: Detektorsysteme III
T 67.5: Vortrag
Mittwoch, 27. März 2019, 17:00–17:15, S03
Momentum transfer reconstruction for the P2 Experiment — •Alexey Tyukin — Institute for Nuclear Physics, Johannes Gutenberg University, Mainz
The P2 experiment at the future MESA accelerator in Mainz will determine the weak mixing angle, a core parameter of the Standard Model. The high precision of this measurement stems from the use of elastic electron-proton scattering, which has a 39 ppb cross-section asymmetry between the two electron helicity states. This asymmetry depends on the momentum transfer Q2 of the scattering process. The experiment will be performed by injecting a high intesity electron beam into a liquid hydrogen target and measuring the outgoing particles.
The P2 detector will consist of a solenoid magnet surrounding the target and two main detector systems: a ring of fused silica crystals as an integrating cherenkov detector and four tracking planes consisting of thin high voltage monolithic active pixel sensors (HV-MAPS). The trajectories of electrons hitting all four tracking planes will be reconstructed to give an estimate on the Q2.
A Geant4 simulation is used to produce realistic detector hit distributions to test the Q2 recontruction performance. The average Q2 value of 0.006 GeV2/c2 can be reconstructed with about 4 % uncertainty for a single event, leading to a high overall precision due to large electron rates of the experiment.