Regular Article - Theoretical Physics
Dispersion relation formalism for the two-photon exchange correction to elastic muon–proton scattering: elastic intermediate state
Institut für Kernphysik and Cluster of Excellence PRISMA, Johannes Gutenberg Universität Mainz, 55128, Mainz, Germany
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Accepted: 11 June 2018
Published online: 21 June 2018
We evaluate the two-photon exchange correction to the unpolarized cross section in the elastic muon–proton scattering within dispersion relations. One of the six independent invariant amplitudes requires a subtraction. We fix the subtraction function to the model estimate of the full two-photon exchange at one of three MUSE beam energies and make a prediction for the two other energies. Additionally, we present single and double polarization observables accounting for the lepton mass.
© The Author(s), 2018