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arXiv · 1103.5363

Explanation for Y(4140) and X(3915)

D V Bugg
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Abstract

The Y(4140) observed by CDF appears to have a novel explanation. Its mass and width coincide within experimental error with a two-step process. In the first step, Y(4140) -> D_sbar + pi + D_s where the pion is virtual. A loop diagram involving this virtual pion allows Y(4140) de-excitation to J/psi + phi. Its predicted spin-parity is JPC = 1++. The same mechanism for Dbar-D^* configurations predicts a similar structure at 3911-3918 MeV, consistent with the peak at 3915 +- 3 MeV observed in omega J/psi by Babar and Belle. Relative branching ratios observed for B+ -> phi J/psi K+ and B+ -> omega J/psi K+ require that this mechanism accelerates decays of Y(4140) by a factor ~ 10^4 compared with isospin-violating decays via Y(4140) -> D_sbar + D^*_s. Similar processes are well known in molecular chemistry.

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D V Bugg. 2011-12-05. Explanation for Y(4140) and X(3915). https://arxiv.org/abs/1103.5363

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