Production of J ψ in 16 and 22 GeVπCu collisions
We have measured the inclusive production of J ψ in 16 and 22 GeV π- copper collisions in a wide aperture magnetic spectrometer. The cross section per Cu nucleus for x > 0 corrected for branching ratio is 64 ± 38 nb at 16 GeV and 196 ± 38 nb at 22 GeV. As threshold is approached, the mean values of the Feynman x distribution increase and the cross section for J ψ production drops steeply. This can be understood in terms of the quark-fusion model where the antiquark content of the pion makes an increasingly significant contribution as M2 s increases. © 1979.
Publication Source (Journal or Book title)
Physics Letters B
LeBritton, J., McCal, D., Melissinos, A., Metcalf, W., Abashian, A., Kalbfleisch, G., Alspector, J., Borenstein, S., & Strand, R. (1979). Production of J ψ in 16 and 22 GeVπCu collisions. Physics Letters B, 81 (3-4), 401-404. https://doi.org/10.1016/0370-2693(79)90363-0