Measuring the weak mixing angle with the P2 experiment at MESA

BERGER N.; AULENBACHER K.; BAUNACK S.; BECKER D.; et al

doi:10.3969/j.issn.0253-2778.2016.06.006

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Open Access JUSTC Research Articles:Physics

Measuring the weak mixing angle with the P2 experiment at MESA

1.
PRISMA Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University, Mainz, Germany
2.
Helmholtz Institue, Mainz, Germany
3.
Department of Physics and Astronomy, University of Manitoba, Winnipeg, Canada
4.
Department of Physics and Astronomy, Stony Brook University, Stony Brook, USA
5.
Physics Department, Syracuse University, Syracuse, USA
6.
PRISMA Cluster of Excellence and Institute of Physics, Johannes Gutenberg University, Mainz, Germany

Funds: Supported the Cluster of Excellence PRISMA and the Collaborative Research Center 1044, both Funded Through the Deutsche Forschungsgemeinschaft (DFG).

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https://doi.org/10.3969/j.issn.0253-2778.2016.06.006

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Corresponding author: BERGER N(corresponding author), Professor/PhD. Research field: high energy physics. E-mail: niberger@uni-mainz.de
Publish Date: 30 June 2016

Abstract Full text PDF

Abstract

Abstract

The P2 experiment in Mainz aims to measure the weak mixing angle sin²θ_W in electron- proton scattering to a precision of 0.13%. In order to suppress uncertainties due to proton structure and contributions from box graphs, both a low average momentum transfer Q² of 4.5×10^-3GeV²/c² and a low beam energy of 155 MeV are chosen. In order to collect the enormous statistics required for this measurement, the new Mainz energy recovery superconducting accelerator(MESA) is being constructed. These proceedings describe the motivation for the measurement, the experimental and accelerator challenges and plans to tackle them.

Abstract

The P2 experiment in Mainz aims to measure the weak mixing angle sin²θ_W in electron- proton scattering to a precision of 0.13%. In order to suppress uncertainties due to proton structure and contributions from box graphs, both a low average momentum transfer Q² of 4.5×10^-3GeV²/c² and a low beam energy of 155 MeV are chosen. In order to collect the enormous statistics required for this measurement, the new Mainz energy recovery superconducting accelerator(MESA) is being constructed. These proceedings describe the motivation for the measurement, the experimental and accelerator challenges and plans to tackle them.