The polarization and Q2 dependence of muoproduced ψ→μ+μ- have been analyzed in a magnetized-steel calorimeter at Fermilab. The reaction γVN→ψN is found to be helicity conserving. Even after allowance for possible Q2 dependence of the decay angular distribution, the ψ muoproduction cross section falls more steeply in Q2 than predicted by ψ dominance.
ASJC Scopus subject areas
- Physics and Astronomy(all)