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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:

P2 contributes to a new ultraprecise measurement of the weak mixing angle complementary to the measurements at high energy like at LHC at low energy. It has a sensitivity to new physics up to masses of 50 TeV. This experiment can be used to measure the neutron distribution in heavy nuclei by neutral current weak interaction. The neutron distribution is directly correlated to the astrophysical problem of the limits of the masses of neutron stars.

 

The main objective of project P2 is the extraction of a precise value of the weak mixing angle sin2 qW from a measurement of the parity-violating (PV) asymmetry in elastic electron proton scattering, with an accuracy comparable to that of the existing collider measurements of Dsin2qW=0.0003 corresponding to a relative accuracy of  0.13.