COMPARISON OF MUON-PROTON AND ELECTRON - PROTON DEEP INELASTIC SCATTERING
W.T. Toner, T. J. Braunstein, W. L. LAKIN, F. MARTIN, M. L. PERL, T. F. Zipf, H. C. BRYANT, B. D. Dieterle · World Scientific series in 20th century physics · 1995
As a test of muon-electron universality we have compared muon-proton and electron-proton inelastic scattering cross sections for lq21 (square of the four-momentum transferred from the lepton) values up to 4.0 (GeV/cj2 &d for lepton energy losses up to 9 GeV.There is no experimentally significant deviation from muon-electron universality.If the muon is assigned the form factor (1.0 +1q21 /A $-' relative to the electron, then with 97.7% confidence Ad > 4.1 GeV/c.