Quark-hadron duality constraints on gamma Z box corrections to parity-violating elastic scattering

摘要

We examine the interference gamma Z box corrections to parity-violating elastic electron-proton scattering in the light of the recent observation of quark-hadron duality in parity-violating deep-inelastic scattering from the deuteron, and the approximate isospin independence of duality in the electromagnetic nucleon structure functions down to Q(2) approximate to 1 GeV2. Assuming that a similar behavior also holds for the gamma Z proton structure functions, we find that duality constrains the gamma Z box correction to the proton's weak charge to be Re square(V)(gamma Z)=(5.4 +/- 0.4) x10(-3) at the kinematics of the Q(weak) experiment. Within the same model we also provide estimates of the gamma Z corrections for future parity-violating experiments, such as MOLLER at Jefferson Lab and MESA at Mainz. (C) 2015 The Authors. Published by Elsevier B.V.