Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-05-10
Phys. Rev. D 72 (2005) 034027.
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 LaTex pages, 2 figures. Final version in journal publication
Scientific paper
10.1103/PhysRevD.72.034027
In this paper, we investigate the nucleon-antinucleon static energies in the Skyrme model with the product {\it Anzatz}. The calculation shows that in the ungroomed $S\bar S$ (skyrmion and antiskyrmion) channel, which leads to rapid annihilation, there exists a quasi-stable bound state which may give a natural explanation for the near-threshold enhancement in the proton-antiproton $(p\bar{p})$ mass spectrum reported by the BES Collaboration and the Belle Collaboration. Similar to the phenomenological well potential of the deuteron, we construct a phenomenological skyrmion-type potential to study this narrow $p\bar{p}$-resonance in $ J/\psi\to \gamma p\bar{p}$. By this potential model, a $p\bar{p}$ baryonium with small binding energies is suggested and the decay width of this state is calculated by WKB approximation. In this picture the decay is attributed to quantum tunnelling and $p\bar{p}$ annihilation. Prediction on the decay mode from the baryonium annihilation at rest is also pointed out.
Li Si
Ma Bo-Qiang
Wu Bin
Yan Mu-Lin
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