EPJ Web of Conferences
Volume 3, 201019th International IUPAP Conference on Few-Body Problems in Physics
|Number of page(s)||14|
|Published online||12 April 2010|
Recent results from the G0 experiment
Department of Physics, University of Zagreb,
2 Department of Physics, College of William and Mary, Williamsburg, VA 23187 USA
3 Institut de Physique Nucléaire d’Orsay, Universite Paris-Sud, F-91406 Orsay Cedex FRANCE
4 Loomis Laboratory of Physics, University of Illinois, Urbana, IL 61801 USA
5 Physics Department, University of Maryland, College Park, MD 20742 USA
6 Thomas Jeﬀerson National Accelerator Facility, Newport News, VA 23606 USA
7 Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213 USA
8 Department of Physics, University of Manitoba, Winnipeg, MB R3T 2N2 CANADA
9 TRIUMF, Vancouver, BC V6T 2A3 CANADA
10 Physics Department, New Mexico State University, Las Cruces, NM 88003 USA
11 LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble, Grenoble, FRANCE
12 Department of Physics and Astronomy, Ohio University, Athens, OH 45701 USA
13 Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 USA
14 Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USA
15 Department of Physics, Virginia Tech, Blacksburg, VA 24061 USA
16 Department of Physics, University of Winnipeg, Winnipeg, MB R3B 2E9 CANADA
17 Jozef Stefan Institute, 1000 Ljubljana, SLOVENIA
18 Yerevan Physics Institute, Yerevan 375036 ARMENIA
19 Department of Physics, Louisiana Tech University, Ruston, LA 71272 USA
20 Department of Physics, Hendrix College, Conway, AR 72032 USA
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We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electrondeuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q2 = 0.22 and 0.63 (GeV/c)2 . Together with our previous forward angle measurement , we can extract strange quark contributions to the electromagnetic form factors of the nucleon, as well as nucleon axial form factor coming from the neutral weak interaction. The results indicate a strange quark magnetic contribution close to zero at these Q2 , and a possible non zero strange quark electric contribution for the high Q2 . The ﬁrst Q2 behavior measurement of the nucleon axial form factor in elastic electron scattering shows a good agreement with radiative corrections calculated at Q2 = 0 and with a dipole form using the axial mass determined in neutrino scattering.
© Owned by the authors, published by EDP Sciences, 2010
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