Test beam facility for the MOLLER and the P2 Experiment

The MOLLER and the P2 experiment aim to measure the weak mixing angle at small momentum transfer in Moller scattering and elastic Electron Proton scattering respectively. The target accuracy is comparable to the most accurate measurements at the Z-pole. This comprises a sensitive test of the Standard Model. Deviations of the measurement results from the Standard Model prediction can point to new physics beyond the Standard Model, and the sensitivities for new physics of MOLLER and P2 are complementary up to a mass scale of about 50 TeV. Both experiments work at very high (order 100GHz) scattered electron rates requiring largely improved analogue detection techniques.

The talk describes a test beam facility by the Mainz group at the MAMI accelerator in Mainz where the prototype detectors for MOLLER and P2 have been extensively tested. A total of about 1000 h beam on detectors has been used for the research and development work for MOLLER and P2. Those tests at the electron accelerator MAMI in Mainz provide an ideal opportunity to validate, benchmark and optimize the Monte Carlo simulations. In this talk an overview of the test beam facility is given and selected results are presented.