• DOI:10.1140/epja/i2018-12611-6
• Corpus ID: 119470019

The P2 experiment

@article{Becker2018ThePE,
  title={The P2 experiment},
  author={Dominik Becker and Razvan Bucoveanu and Carsten Grzesik and Kathrin Imai and Ruth Kempf and Matthias Molitor and A. V. Tyukin and Marco Zimmermann and David Armstrong and Kurt Aulenbacher and Sebastian Baunack and R. S. Beminiwattha and Niklaus Berger and Peters Bernhard and Andrea S. Brogna and Luigi Capozza and Silviu Covrig Dusa and Wouter Deconinck and J{\"u}rgen Diefenbach and James A. Dunne and Jens Erler and C. Gal and M. T. W. Gericke and Boris Gl{\"a}ser and Mikhail Gorchtein and B. Gou and Wolfgang Gradl and Yoshio Imai and Nicolas Produit and Frank Maas and Juliette Mammei and Jie Pan and Preeti Pandey and Kent D. Paschke and Ivan Peri{\'c} and Mark L. Pitt and Sakib Rahman and S. Riordan and David Rodr{\'i}guez Pi{\~n}eiro and C. Sfienti and Iu. Sorokin and Paul A. Souder and Hubert Spiesberger and M. Thiel and Valery Tyukin and Quirin Weitzel},
  journal={The European Physical Journal A},
  year={2018},
  volume={54},
  pages={1-61}
}

• D. Becker, R. Bucoveanu, +43 authors Q. Weitzel
• Published 13 February 2018
• Physics
• The European Physical Journal A

Abstract.We describe the research and development work for the P2 experiment which aims for a high precision determination of the weak mixing angle $\sin^{2}\theta_{W}$sin2θW to a precision of 0.15% at a four-momentum transfer of $4.5\times 10^{-3}$4.5×10-3 GeV2. This accuracy, comparable to existing measurements at the Z pole, allows for a sensitive test of the Standard Model up to a mass scale of 50 TeV, extendable to 60 TeV. The weak mixing angle is connected to the weak charge of the proton which will be extracted from a measurement of the parity violating cross section asymmetry $-39.94 \times 10^{-9}$-39.94×10-9 in elastic electron-proton scattering. A total accuracy of $0.57 \times 10^{-9}$0.57×10-9 is achievable in a measurement time of 11000 h using a 150μA polarized electron beam impinging on a 60 cm liquid hydrogen target. The P2 asymmetry is smaller than any asymmetry measured so far in electron scattering with an unprecedented goal for the accuracy. The use of a solenoid spectrometer with 100% $\phi$ϕ-acceptance as well as an atomic hydrogen trap polarimeter are new features, which have never before been used in parity-violation experiments. In order to collect the enormous statistics required for this measurement, the new Mainz Energy-Recovering Superconducting Accelerator (MESA) is under construction. Plans for the associated beam control system and the polarimetry are described in this article as well. A liquid hydrogen high-power target with an extremely low noise level of 10 ppm needs to be designed and constructed. We report in addition on the conceptual design of the P2 spectrometer, its Cherenkov detectors, the integrating read-out electronics as well as the ultra-thin, fast tracking detectors. The physics program of the MESA facility comprises indirect, high precision search for physics beyond the Standard Model, measurement of the neutron distribution in nuclear physics, single-spin asymmetries, and a possible future extension to the measurement of hadronic parity violation.