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arXiv 0904.2163nucl-thhep-exhep-ph
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关于X（1835）重子素的结构

On the structure of the X(1835) baryonium

J. -P. Dedonder, B. Loiseau, B. El-Bennich, S. Wycech

备注：
7 pages, 7 figures, this version corresponds to the published paper in Phys. Rev. C: minor corrections done and in section 5 suggestions of experiments to confirm the link of the X(1835) to the antiproton-proton system
发表信息：
Phys.Rev.C80:045207,2009
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摘要：

北京谱仪合作组对J/psi -> gamma p pbar衰变的测量表明在p-pbar阈值处有增强。在另一个实验中，北京谱仪发现了π介子不变质量的一个峰值，该峰值产生于可能相关的衰变J/psi -> γ π + π-η '。利用描述所有N-Nbar散射数据的半唯象势模型，我们证明了这两种效应可以用自旋和同位旋单重态S波中的宽准束缚态来解释。观察到的峰的结构是由于干扰的准束缚态与背景振幅，并取决于湮灭机制。

英文摘要：

The measurement by the BES collaboration of J/psi -> gamma p pbar decays indicates an enhancement at the p-pbar threshold. In another experiment BES finds a peak in the invariant mass of pi-mesons produced in the possibly related decay J/psi -> gamma pi+ pi- eta'. Using a semi-phenomenological potential model which describes all the N-Nbar scattering data, we show that the explanation of both effects may be given by a broad quasi-bound state in the spin and isospin singlet S wave. The structure of the observed peak is due to an interference of this quasi-bound state with a background amplitude and depends on the annihilation mechanism.

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