Evidence for Longitudinal Photon Polarization in Muon-Pair Production by Pions
- 22 October 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 43 (17), 1219-1222
- https://doi.org/10.1103/physrevlett.43.1219
Abstract
Data on -pair production by pions are examined as a function of and for longitudinal photon polarization. Evidence in the form of a term in the helicity angular distribution is observed for near 1. This is conclusive evidence that production in this region is not predominantly through on-shell quark annihilation. The result is consistent with a calculation based on quantum chromodynamics.
Keywords
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