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P2: Precision parity violating electron scattering

Principal Investigators:

F. Maas (Helmholtz Institute Mainz; PRISMA Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University Mainz),

N.Berger (PRISMA Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University Mainz),

C. Sfienti (Helmholtz Institute Mainz; PRISMA Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University Mainz

 

Research:

The P2 collaboration aims for a high precision measurement of the parity violating asymmetry in the elastic scattering of polarized electrons off unpolarized nuclei. The expected data will be interpreted as a determination of the weak mixing angle, one of the fundamental parameters of the Standard Model, with a precision competitive with measurements at LEP or LHC.s.

The main objective of the P2 experiment is the determination of the weak mixing angle sin²θW from the measurement of the parity violating (PV) asymmetry in the elastic electron proton scattering, with an accuracy comparable to that of the existing collider measurements of Δsin²Θw=0.0003 (0.13% relative uncertainty). The low momentum transfer of Q²=0.005 (GeV/c)² makes the P2 project complementary compared to past and upcoming high energy experiments. The weak mixing angle is a key parameter of the Standard Model that relates the couplings of W and Z bosons to leptons and quarks. Its precise determination allows to test the Standard Model and either will help to exclude Standard Model extensions or to identify the type of physics beyond the Standard Model.

 

Publications:

Dominik Becker, Razvan Bucoveanu, Carsten Grzesik, Ruth Kempf, Kathrin Imai, Matthias Molitor, Alexey Tyukin, Marco Zimmermann, David Armstrong, Kurt Aulenbacher, Sebastian Baunack, Rakitha Beminiwattha, Niklaus Berger, Peter Bernhard, Andrea Brogna, Luigi Capozza, Silviu Covrig Dusa, Wouter Deconinck, Jürgen Diefenbach, Jens Erler, Ciprian Gal, Boris Gläser, Boxing Gou, Wolfgang Gradl, Michael Gericke, Mikhail Gorchtein, Yoshio Imai, Krishna S. Kumar, Frank Maas (Corresponding author), Juliette Mammei, Jie Pan, Preeti Pandey, Kent Paschke, Ivan Perić, Mark Pitt, Sakib Rahman, Seamus Riordan, David Rodríguez Piñeiro, Concettina Sfienti, Iurii Sorokin, Paul Souder, Hubert Spiesberger, Michaela Thiel, Valery Tyukin, Quirin Weitzel, The P2 experiment: A future high-precision measurement of the weak mixing angle at low momentum transfer
doi: 10.1140/epja/i2018-12611-6