Two-boson exchange corrections to parity-violating elastic electron-proton scattering

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.035208· OSTI ID:21386715

Haiqing, Zhou ^[1]; Kao, C W ^[2]; Yang, S N ^[3]; Nagata, Keitaro ^[2]

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1. Department of Physics, Southeast University, NanJing 211189 (China)
2. Department of Physics, Chung-Yuan Christian University, Chung-Li 32023, Taiwan (China)
3. Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan (China)

Details of the calculation of two-boson exchange effects in parity-violating elastic ep scattering within a simple hadronic model, including both the nucleon and the {Delta}(1232)-resonance intermediate states, are presented. We examine the sensitivity of our results with respect to choice of form factors. We emphasize the importance of using correct relations relating N->{Delta} and {Delta}->N transition vertex functions. The N{Delta} Coulomb quadrupole transition is found to play an important role at higher Q{sup 2}>=3.0 GeV{sup 2}. We also elucidate the relation between our results and the well-known result on the {gamma}Z-boson exchange effect given by Marciano and Sirlin. The effect of the nucleon contribution {delta}{sub N} to parity asymmetry A{sub PV} is found to be, in general, larger than the corresponding {Delta} contribution {delta}{sub {Delta}} except at extreme forward angles. Corrections to the extracted values of the strange form factors G{sub E}{sup s}+{beta}G{sub M}{sup s} from the HAPPEX, A4, and G0 data are also presented. The total TBE corrections to the extracted values of G{sub E}{sup s}+{beta}G{sub M}{sup s} in recent HAPPEX, G0, and A4 experiments are, depending on kinematics, found to be small except in a few cases where they range from -20.6% to 48.3%.

• OSTI ID: 21386715
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 3; Other Information: DOI: 10.1103/PhysRevC.81.035208; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BOSON-EXCHANGE MODELS
COMPUTERIZED SIMULATION
CORRECTIONS
DELTA-1232 BARYONS
ELECTRON-PROTON INTERACTIONS
FORM FACTORS
INTERMEDIATE STATE
NUCLEONS
PARITY
RESONANCE
SCATTERING
SENSITIVITY
VERTEX FUNCTIONS
BARYONS
DELTA BARYONS
DIMENSIONLESS NUMBERS
ELECTRON-NUCLEON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
N*BARYONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
SIMULATION