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Phys. Rev. C 40, 2218–2225 (1989)

Pion-exchange contribution to the parity-violating asymmetry in p→p scattering

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Richard R. Silbar
Theoretical Division, Los Alamos National Laboratory, University of California, Los Alamos, New Mexico 87545

W. M. Kloet
Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903

Leonard S. Kisslinger
Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213

J. Dubach
Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003
Continuous Electron Beam Accelerator Facility (CEBAF), 12000 Jefferson Avenue, Newport News, Virginia 23606

Received 14 August 1989; published in the issue dated November 1989

Charged pion exchange, resulting in an nΔ++ state, contributes positively to the weak scattering asymmetry in longitudinally polarized p→p scattering at medium energy. This pion-exchange contribution combined with the traditional ρ and ω ‘‘elastic’’ contributions moves the total theoretical prediction into better agreement with the 800-MeV experimental data point. The pion-exchange contribution has both inelastic and elastic scattering components and is sizable even below the pion production threshold. Strong distortions enhance the magnitude of the effect.

© 1989 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.40.2218
DOI:
10.1103/PhysRevC.40.2218
PACS:
21.30.+y, 13.75.Cs, 11.30.Er
 
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