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Title: Contribution of two-boson exchange with {delta}(1232) excitation to parity-violating elastic electron-proton scattering

Abstract

We study the leading electroweak corrections in the precision measurement of the strange form factors. Specifically, we calculate the two-boson exchange (TBE), two-photon exchange (TPE) plus {gamma}Z exchange ({gamma}ZE), and corrections with {delta}(1232) excitation to the parity-violating asymmetry of the elastic electron-proton scattering. The interplay between nucleon and {delta} contributions is found to depend strongly on the kinematics, as {delta}{sub {delta}} begins as negligible at backward angles but becomes very large and negative and dominant at forward angles, while {delta}{sub N} always stays positive and decreases monotonically with increasing {epsilon}. The total TBE corrections to the extracted values of G{sub E}{sup s}+{beta}G{sub M}{sup s} in recent experiments of HAPPEX and G0 are, depending on kinematics, found to be large and range between 13% and -75%, but are found to be small in the case of A4 experiments.

Authors:
;  [1];  [2];  [3]
  1. Department of Physics, Chung-Yuan Christian University, Chung-Li 32023, Taiwan (China)
  2. Department of Physics, Southeast University, Nanjing 211189 (China)
  3. Department of Physics, National Taiwan University, Taipei 10617, Taiwan (China)
Publication Date:
OSTI Identifier:
21289898
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.79.062501; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BOSON-EXCHANGE MODELS; CORRECTIONS; DELTA-1232 BARYONS; ELASTIC SCATTERING; ELECTRON-PROTON INTERACTIONS; EXCITATION; FORM FACTORS; NUCLEONS; PARITY; PHOTONS; WEINBERG-SALAM GAUGE MODEL

Citation Formats

Nagata, Keitaro, Kao, C W, Haiqing, Zhou, Shinnan, Yang, and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan. Contribution of two-boson exchange with {delta}(1232) excitation to parity-violating elastic electron-proton scattering. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.79.062501.
Nagata, Keitaro, Kao, C W, Haiqing, Zhou, Shinnan, Yang, & Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan. Contribution of two-boson exchange with {delta}(1232) excitation to parity-violating elastic electron-proton scattering. United States. https://doi.org/10.1103/PHYSREVC.79.062501
Nagata, Keitaro, Kao, C W, Haiqing, Zhou, Shinnan, Yang, and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan. 2009. "Contribution of two-boson exchange with {delta}(1232) excitation to parity-violating elastic electron-proton scattering". United States. https://doi.org/10.1103/PHYSREVC.79.062501.
@article{osti_21289898,
title = {Contribution of two-boson exchange with {delta}(1232) excitation to parity-violating elastic electron-proton scattering},
author = {Nagata, Keitaro and Kao, C W and Haiqing, Zhou and Shinnan, Yang and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan},
abstractNote = {We study the leading electroweak corrections in the precision measurement of the strange form factors. Specifically, we calculate the two-boson exchange (TBE), two-photon exchange (TPE) plus {gamma}Z exchange ({gamma}ZE), and corrections with {delta}(1232) excitation to the parity-violating asymmetry of the elastic electron-proton scattering. The interplay between nucleon and {delta} contributions is found to depend strongly on the kinematics, as {delta}{sub {delta}} begins as negligible at backward angles but becomes very large and negative and dominant at forward angles, while {delta}{sub N} always stays positive and decreases monotonically with increasing {epsilon}. The total TBE corrections to the extracted values of G{sub E}{sup s}+{beta}G{sub M}{sup s} in recent experiments of HAPPEX and G0 are, depending on kinematics, found to be large and range between 13% and -75%, but are found to be small in the case of A4 experiments.},
doi = {10.1103/PHYSREVC.79.062501},
url = {https://www.osti.gov/biblio/21289898}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 79,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2009},
month = {Mon Jun 15 00:00:00 EDT 2009}
}