8 research outputs found
An Interesting Charmonium State Formation and Decay :
Massless perturbative QCD forbids, at leading order, the exclusive
annihilation of proton-antiproton into some charmonium states, which, however,
have been observed in the channel, indicating the significance of
higher order and non perturbative effects in the few GeV energy region. The
most well known cases are those of the () and the . The
case of the is considered here and a way of detecting such a state
through its typical angular distribution in the radiative decay
is suggested. Estimates of the branching ratio , as given by a quark-diquark model of the nucleon, mass corrections
and an instanton induced process are presented.Comment: 9 pages (no figures), Plain TeX, CBPF-NF-014/94, INFNCA-TH-94-