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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.28: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Results from the A4 Parity Violating Experiment at MAMI — •Sebastian Baunack — Institut fuer Kernphysik, J.J. Becherweg 45, 55099 Mainz

The A4 collaboration at the Mainz Mikrotron MAMI is investigating the contribution of strange quarks to the form factors of the nucleon. The experimental method is the measurement of the parity violating asymmetry in the cross section in the elastic scattering of polarized electrons off unpolarized protons.
With a scattering angle of 35 and an electron energy of 854.3 MeV and 570.1 MeV, measurements have been taken for Q2=0.23 GeV2 and Q2=0.1 GeV2 respectively. Both results and their implication on the strangeness contribution will be presented.
Futhermore, the A4 collaboration has made measurements with transversely polarized electrons to investigate the transverse single spin asymmetry. Results for Q2=0.23 GeV2 will also be presented.

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