https://doi.org/10.1140/epja/i2006-09-012-7
MAMI 2005
Parity-violating electron scattering at the MAMI facility in Mainz
The strangeness contribution to the form factors of the nucleon
Institut de Physique Nucléaire, CNRS/IN2P3, Université de Paris Sud, 15, rue Georges Clemenceau, F-91406, Orsay CEDEX, France
* e-mail: maas@ipno.in2p3.fr
Received:
26
May
2006
Accepted:
26
May
2006
Published online:
29
May
2006
A measurement of the weak form factor of the proton allows a separation of the strangeness contribution to the electromagnetic form factors. The weak form factor is accessed experimentally by the measurement of a parity violating (PV) asymmetry in the scattering of polarized electrons on unpolarized protons. We performed such measurements with the setup of the A4-experiment at the MAMI accelerator facility in Mainz. The role of strangeness in low energy nonperturbative QCD is discussed. The A4-experiment is presented as well as the results on the strangeness form factors which have been measured at two Q2-values. The plans for backward angle measurements at the MAMI facility are presented.
PACS: 12.15.-y Electroweak interactions – / 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries – / 13.40.Gp Electromagnetic form factors – / 25.30.Bf Elastic electron scattering –
© Società Italiana di Fisica and Springer-Verlag, 2006
