Explanation for Y(4140) and X(3915)
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.
Cite
@article{arxiv.1103.5363,
title = {Explanation for Y(4140) and X(3915)},
author = {D V Bugg},
journal= {arXiv preprint arXiv:1103.5363},
year = {2011}
}
Comments
5 pages, 5 figures. Major revision, including new experimental information and further insight into the reaction mechanism. Withdrawn: programming error. After correction, the predicted width of Y(4140) is much larger than experiment