Detailed Analysis of Two-Boson Exchange in Parity-Violating e-p Scattering

Tjon, John; Blunden, Peter; Melnitchouk, Wolodymyr

doi:10.1103/PhysRevC.79.055201

Title: Detailed Analysis of Two-Boson Exchange in Parity-Violating e-p Scattering

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.79.055201· OSTI ID:956315

Tjon, John; Blunden, Peter; Melnitchouk, Wolodymyr

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 near 1), where the nucleon contribution vanishes. The dependence of the corrections on the input hadronic form factors is small for Q^2 < 1 GeV^2, but becomes significant at larger Q^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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-060R23177

OSTI ID:: 956315

Report Number(s):: JLAB-THY-09-956; arXiv:0903.2759; DOE/OR/23177-0650

Journal Information:: Physical Review C, Journal Name: Physical Review C

Country of Publication:: United States

Language:: English

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