Charmonium state formation and decay: [ital p[bar p]][r arrow][sup 1][ital D][sub 2][r arrow][sup 1][ital P][sub 1][gamma]

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.2478· OSTI ID:6579477

Anselmino, M; Caruso, F; Murgia, F; Negrao, M R ^[1]

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1. Dipartimento di Fisica Teorica; Universita di Torino; and Istituto Nazionale di Fisica Nucleare; Sezione di Torino; Via Pietro Giuria 1; I-10125 Torino (Italy) Centro Brasileiro de Pesquisas Fisicas/CNPq; Rua Dr. Xavier Sigaud 150; 22290-180; Rio de Janeiro; Rio de Janeiro (Brazil) Instituto de Fisica; Universidade do Estado do Rio de Janeiro; Rua Sao Francisco Xavier 524; 20550-011; Rio de Janeiro; Rio de Janeiro (Brazil) Istituto Nazionale di Fisica Nucleare; Sezione di Cagliari; Via A. Negri 18; I-09127 Cagliari (Italy)

Massless perturbative QCD forbids, at leading order, the exclusive annihilation of a proton-antiproton pair into some charmonium states, which, however, have been observed in the [ital p[bar p]] channel, indicating the significance of higher order and nonperturbative effects in the few GeV energy region. The most well known cases are those of the [sup 1][ital S][sub 0]([eta][sub [ital c]]) and the [sup 1][ital P][sub 1]. The case of the [sup 1][ital D][sub 2] is considered here and a way of detecting such a state through its typical angular distribution in the radiative decay [sup 1][ital D][sub 2][r arrow][sup 1][ital P][sub 1][gamma] is suggested. Estimates of the branching ratio [ital B]([sup 1][ital D][sub 2][r arrow][ital p[bar p]]), as given by a quark-diquark model of the nucleon, mass corrections, and an instanton-induced process are presented.

• OSTI ID: 6579477
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:5; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED MESONS
CHARMONIUM
COMPOSITE MODELS
D MESONS
DECAY
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ETA C-2980 MESONS
ETA C-3590 MESONS
FERMIONS
FIELD THEORIES
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
INSTANTONS
INTERACTIONS
MATHEMATICAL MODELS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
QUASI PARTICLES
RADIATIVE DECAY