科研之友
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摘要
A possible interpretation of the near-threshold enhancement in the (pp) mass spectrum in J/psi ->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 ->eta 4 pi), Br(X ->eta 2 pi), and Br(X -> 3 eta) are calculated. It is shown that if the X(1860) is a bound state of (pp), the decay channel (X ->eta 4 pi) is favored over (X ->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 ->gamma pp from other possibilities. Experimental checks are expected. An intuitive picture for our results is discussed.
- 出版日期2005-7
- 单位中国科学技术大学
