Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-10-16
PoS EPS-HEP2009 2009:085,2009
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 8 postscript figures, to be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726
Scientific paper
From a study of the X(3872) mass and width based on the world's largest sample of $X(3872)\to J/\psi\pi^+\pi^-$ decays, we find that our X(3872) signal is consistent with a single state, and leads to the most precise measurement of the X(3872) mass. We also report the recent evidence for a new narrow structure, Y(4140), decaying to the $J/\psi \phi$ final state, in exclusive $B^+\to J/\psi\phi K^+$ decays in a data sample corresponding to an integrated luminosity of 2.7 \ifb collected at the CDF II detector. This narrow structure with its mass well above open charm pairs is unlikely to be a candidate for a conventional charmonium state.
CDF collaboration for the
Yi Kai
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