Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session FD: Electroweak Experiment and Theory
9:00 AM–11:30 AM,
Friday, October 26, 2018
Hilton
Room: Kohala 3
Chair: Dinko Pocanic, University of Virginia
Abstract ID: BAPS.2018.HAW.FD.4
Abstract: FD.00004 : The P2 Experiment: A future high-precision measurement of the electroweak mixing angle at low momentum transfer*
(Author Not Attending)
Presenter:
Michael T Gericke
(Univ of Manitoba)
Author:
Michael T Gericke
(Univ of Manitoba)
We provide a brief overview of the future P2 experiment at the upcoming MESA accelerator in Mainz, Germany. The MESA facility is optimized for the detection of order ppb level parity-violating cross-section asymmetries in electron scattering. The experiment aims for a determination of the weak mixing angle to a precision of 0.14%, at a four-momentum transfer of 0.0045 GeV2. The proposed accuracy is comparable to existing measurements at the Z pole. This requires a measurement of the parity-violating cross-section asymmetry in elastic electron-proton scattering, with a total accuracy of 0.56 ppb (1.4%) in a 10000 hour long run using a 155 MeV, 150 μA beam of polarized electrons, impinging on a 60 cm LH2 target. At this low momentum transfer, the relation between the measured asymmetry, the weak charge of the proton, and the weak mixing angle is precisely predicted and therefore comprises a sensitive test of the standard model up to a mass scale of 50 TeV. We will briefly describe the measurement methodology, the experimental setup, and the physics.
*This work is supported by the Deutsche Forschungsgemeinschaft (DFG), the US Department of Energy (DOE), the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Foundation for Innovation (CFI).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.FD.4
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