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Phys. Rev. D 69, 054022 (2004) [5 pages]

Single-spin polarization effects and the determination of timelike proton form factors

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Stanley J. Brodsky1,2,*, Carl E. Carlson2,3,†, John R. Hiller4,‡, and Dae Sung Hwang5,§
1Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA
2Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA
3Nuclear and Particle Theory Group, Physics Department, College of William and Mary, Williamsburg, Virginia 23187-8795, USA
4Department of Physics, University of Minnesota-Duluth, Duluth, Minnesota 55812, USA
5Department of Physics, Sejong University, Seoul 143-747, Korea

Received 2 December 2003; published 23 March 2004

We show that measurements of the proton’s polarization in e+e-pp̅ strongly discriminate between analytic forms of models which fit the proton form factors in the spacelike region. In particular, the single-spin asymmetry normal to the scattering plane measures the relative phase difference between the timelike GE and GM form factors. The expected proton polarization in the timelike region is large, of the order of several tens of percent.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.69.054022
DOI:
10.1103/PhysRevD.69.054022
PACS:
13.88.+e, 13.40.Gp, 13.66.Bc

*Electronic address: sjbth@slac.stanford.edu

Electronic address: carlson@physics.wm.edu

Electronic address: jhiller@d.umn.edu

§Electronic address: dshwang@sejong.ac.kr