6533b821fe1ef96bd127c37a
RESEARCH PRODUCT
Reduced uncertainty of the axial γZ-box diagram correction to the proton’s weak charge
Jens ErlerJens ErlerOleksandr KoshchiiH. SpiesbergerH. SpiesbergerMikhail GorchteinChien Yeah Sengsubject
PhysicsParticle physics010308 nuclear & particles physicsScatteringStructure functionElectron01 natural sciencesGraphProton scatteringIsospin0103 physical sciencesNeutrino010306 general physicsNucleondescription
We present the fully up-to-date calculation of the γZ-box correction which needs to be taken into account to determine the weak mixing angle at low energies from parity-violating electron proton scattering. We make use of neutrino and antineutrino inclusive scattering data to predict the parity-violating structure function F3γZ by isospin symmetry. Our new analysis confirms previous results for the axial contribution to the γZ-box graph and reduces the uncertainty by a factor of 2. In addition, we note that the presence of parity-violating photon-hadron interactions induces an additional contribution via F3γγ. Using experimental and theoretical constraints on the nucleon anapole moment we are able to estimate the uncertainty associated with this contribution. We point out that future measurements are expected to significantly reduce this latter uncertainty.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-09-17 | Physical Review |