Abstract
Data on-pair production by pions are examined as a function of x and PT for longitudinal photon polarization. Evidence in the form of a sin2* term in the helicity angular distribution is observed for x 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.
Original language | English (US) |
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Pages (from-to) | 1219-1222 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 43 |
Issue number | 17 |
DOIs | |
State | Published - 1979 |
ASJC Scopus subject areas
- Physics and Astronomy(all)