High-Energy Muon-Proton Scattering: Muon-Electron Universality

Abstract

Measurements of the $\ensuremath{\mu}\ensuremath{-}p$ elastic cross section in the range $0.15<{q}^{2}<0.85$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ are compared with similar $e\ensuremath{-}p$ data. We find an apparent disagreement between the muon and electron experiments which can possibly be accounted for by a combination of systematic normalization errors.