QCD in the Limit xF → 1 as Studied in the Reaction π-N → µ+µ-X

摘要: In Fermilab experiment E 615 wel have measured the production of high-mass muon pairs with 80- and 252-GeV pion beams. The relatively large momentum quarks in pions allows us study QCD subprocess \(q\overline{q}\) → µ + − kinematic limit \(x_{\pi }^{\overline{q}}\) 1. data are consistent many features a higher-twist analysis, particulary departure muon-pair angular distribution from standard form 1+cos2 θ t . Analysis J/ψ) ψ’ same sample gives further evidence for interesting effects as xF 1, which we attribute to process \(c\overline{c}\).