Published December 31, 2007 | Version v1
Journal article Metadata-only

Two-Photon-Exchange and γZ-Exchange Corrections to Parity-Violating Elastic Electron-Proton Scattering

Creators

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

Description

Leading electroweak corrections play an important role in precision measurements of the strange form factors. We calculate the two-photon-exchange (TPE) and γZ-exchange corrections to the parity-violating asymmetry of the elastic electron-proton scattering in a simple hadronic model including the finite size of the proton. We find both can reach a few percent and are comparable in size with the current experimental measurements of strange-quark effects in the proton neutral weak current. The effect of γZ exchange is in general larger than that of TPE, especially at low momentum transfer Q2≤1 GeV2. Their combined effects on the values of GEs+GMs extracted in recent experiments can be as large as -40% in certain kinematics

Additional details

Identifiers

DOI
10.1103/PhysRevLett.99.262001;
arXiv
arXiv:0708.4297v2;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
99
Journal Issue
26
Journal Page Range
p. 262001-262001.4
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
39050143
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
ASYMMETRY; ELASTIC SCATTERING; ELECTRON-PROTON INTERACTIONS; FORM FACTORS; MOMENTUM TRANSFER; PARITY; PHOTONS; PROTONS; S QUARKS
Descriptors DEC
BARYONS; BOSONS; DIMENSIONLESS NUMBERS; ELECTRON-NUCLEON INTERACTIONS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; MASSLESS PARTICLES; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; QUARKS; SCATTERING; STRANGE PARTICLES

Optional Information

Notes
(c) 2007 The American Physical Society