Updated results from the SAMPLE experimentDamon T. Spayde
Loomis Laboratory of Physics, University of Illlinois, 1110 West Green Street, Urbana, IL 61801, USA
(Received 15 November 2004 / Published online 08 February 2005)
The SAMPLE collaboration has recently completed its measurements of the parity violating elastic electron scattering asymmetry from hydrogen and the quasielastic asymmetry from deuterium [1,2,3,4,5]. Neutral weak form factors of the nucleon, both vector and axial, can be extracted from these data and used to determine the strange quark contribution to electromagnetic form factors. The results of the original measurements at a Q2 of 0.1 (GeV/c)2 [2,3] have recently been reanalyzed , incorporating improvements in simulation and new background data, and combined with a new measurement of the quasielastic deuteron asymmetry at a Q2 of 0.038 (GeV/c)2 . Final results from this new analysis and data set will be presented.
PACS: 13.60.-r Photon and charged-lepton interactions with hadrons - 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries - 13.40.Gp Electromagnetic form factors - 14.20.Dh Protons and neutrons
The Author, for the SAMPLE Collaboration. Present address: Department of Physics, Grinnell College, 1116 8th Avenue, Grinnell, IA 50112 USA
© Società Italiana di Fisica, Springer-Verlag 2005