An Interesting Charmonium State Formation and Decay: <math>pp→1D2 → 1P1 γ</math>

Physics NotePublished

An Interesting Charmonium State Formation and Decay: $<math>p\bar{p}\to^{1}D_2 \to ^{1}P_1 \ \gamma</math>$

M. Anselmino; F. Caruso; F. Murgia; M. M. R. Negrao

1994

Authors: M. Anselmino; F. Caruso; F. Murgia; M. M. R. Negrao
Type: Physics Note
Status: Published
Publication date: 1994
Description: Massless perturbative QCD forbids, at leading order, the exclusive annihilation of proton-antiproton into some charmonium states, which, however, have been observed in the <math>p\bar{p}</math> 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 <math>^1S_0 (\eta_c)\,\!</math> and the <math>^{1}P_1\,\!</math> . The case of the <math>^{1}D_2\,\!</math> is considered here and a way of detecting such a state through its typical angular distribution in the radiative decay <math>^{1}D_2 \to ^{1}P_1 \gamma\,\!</math> is suggested. Estimates of the branching ratio <math>BR(^{1}D_2 \to p\bar{p})</math>, as given by a quark-diquark model of the nucleon, mass corrections and an instanton induced process are presented.
Year: 1994
Number: CBPF-NF-014/94
Linked to a thesis: No
Linked to a grant: No