Proton-antiproton annihilation in baryonium

Journal Article · Fri Jul 01 00:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.015208· OSTI ID:20698860

Guijun, Ding; Mulin, Yan ^[1]

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1. Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei, Anhui 230026 (China)

A possible interpretation of the near-threshold enhancement in the (pp) mass spectrum in J/{psi}{yields}{gamma}pp is the existence of a narrow baryonium resonance X(1860). Mesonic decays of the (pp) bound state X(1860) because of the nucleon-antinucleon annihilation are investigated in this article. Mesonic coherent states with fixed G parity and P parity have been constructed. The Amado-Cannata-Dedoder-Locher-Shao formulation is extended to the decays of the X(1860). By this method, the branch-fraction ratios of Br(X{yields}{eta}4{pi}),Br(X{yields}{eta}2{pi}), and Br(X{yields}3{eta}) are calculated. It is shown that if the X(1860) is a bound state of (pp), the decay channel (X{yields}{eta}4{pi}) is favored over (X{yields}{eta}2{pi}). In this way, we develop criteria for distinguishing the baryonium interpretation for the near-threshold enhancement effects in the (pp) mass spectrum in J/{psi}{yields}{gamma}pp from other possibilities. Experimental checks are expected. An intuitive picture for our results is discussed.

• OSTI ID: 20698860
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANNIHILATION OPERATORS
ANTIPROTONS
BARYONIUM
BOUND STATE
EIGENSTATES
ETA MESONS
G PARITY
HADRONIC PARTICLE DECAY
J PSI-3097 MESONS
MASS FORMULAE
MASS SPECTRA
PARITY
PHOTONS
PIONS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
RESONANCE PARTICLES
REST MASS