Exclusive Charmonium Production at CDF

We have observed the reactions p¯p ! pX¯p, with X being a centrally produced J/ , (2S), or c0, and ! μ+μ− in p¯p collisions at ps = 1.96 TeV. The required event topology consists of two oppositely charged central muons, and either no other particles or one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, p ! J/ ( (2S))p, observed here for the first time in hadronhadron collisions. We also observe exclusive c0 ! J/ + decays. The cross sections d dy |y=0 for J/ , (2S), and c0 are (3.92 ± 0.25(stat) ± 0.52(syst)) nb, (0.53 ± 0.09(stat) ± 0.10(syst)) nb, and (76 ± 10(stat) ± 10(syst)) nb, respectively, and the continuum is consistent with QED.