High-energy test of quantum electrodynamics
Abstract
Thirty-five directly produced electron pairs have been observed by following 150 m of 150-GeV muon track length in nuclear emulsion. These pairs have been compared with the pairs produced by 200-GeV protons and 15.8-GeV/c muons in terms of (i) their total energy distribution, (ii) the fractional transfer of the primary energy to the pairs, (iii) the energy partition between the two members, (iv) the angular divergence, (v) the invariant mass of the electron pairs, and (vi) the net transverse-momentum distribution of each pair. Present theories disagree with the experimental results.
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