skip to main content

SciTech ConnectSciTech Connect

Title: P2 - The weak charge of the proton

The goal of the P2 project is a new high precision determination of the electroweak mixing angle θ{sub W}. The project has been approved in January 2012 and the experiment will be carried out at the upcoming MESA accelerator facility in Mainz. The experimental method is a measurement of the proton weak charge Q{sub W}(p) through the parity violating asymmetry in the elastic electron-proton scattering at low values of Q{sup 2} ∼ 0.003 GeV{sup 2}. We have estimated an achievable fractional precision of 0.15% in the determination of sin{sup 2}(θ{sub W}), which corresponds to an uncertainty of 2.1% for Q{sup W}(p). In this article, we discuss the achievable precision within Project P2 and present first results of conceptual studies for the experiment.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, J. J. Becherweg 45, D-55099 Mainz (Germany)
  2. University of Massachusetts Amherst, Amherst, Massachusetts 01003 (United States)
  3. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, J. J. Becherweg 45, D-55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany and Helmholtz-Ins (Germany)
Publication Date:
OSTI Identifier:
22280704
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1563; Journal Issue: 1; Conference: Workshop to explore physics opportunities with intense, polarized electron beams at 50-300 MeV, Cambridge, MA (United States), 14-16 Mar 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATOR FACILITIES; ACCURACY; ASYMMETRY; ELASTIC SCATTERING; ELECTRON-PROTON INTERACTIONS; FOUR MOMENTUM TRANSFER; GEV RANGE; PARITY; PARTICLE STRUCTURE; PROTONS; WEINBERG ANGLE