Detailed analysis of two-boson exchange in parity-violating e-p scattering
- Physics Department, University of Utrecht (Netherlands)
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)
- Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
We present a comprehensive study of two-boson exchange (TBE) corrections in parity-violating electron-proton elastic scattering. Within a hadronic framework, we compute contributions from box (and crossed box) diagrams in which the intermediate states are described by nucleons and {delta} baryons. The {delta} contribution is found to be much smaller than the nucleon one at backward angles (small {epsilon}), but becomes dominant in the forward scattering limit ({epsilon}{yields}1), where the nucleon contribution vanishes. The dependence of the corrections on the input hadronic form factors is small for Q{sup 2} < or approx. 1 GeV{sup 2}, but becomes significant at larger Q{sup 2}. We compute the nucleon and {delta} TBE corrections relevant for recent and planned parity-violating experiments, with the total corrections ranging from -1% for forward angles to 1-2% at backward kinematics.
- OSTI ID:
- 21286975
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevC.79.055201; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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