Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-08-14
Phys.Rev.Lett.100:142001,2008
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 3 figures, a 2007 Lepton-Photon Symposium submission is modified and submitted to PRL
Scientific paper
10.1103/PhysRevLett.100.142001
A distinct peak is observed in the pi^+/- psi' invariant mass distribution near 4.43 GeV in B->K pi^+/- psi' decays. A fit using a Breit Wigner resonance shape yields a peak mass and width of 4433+-4(stat)+-2(syst) MeV and Gamma = 45^+18_-13(stat) ^+30_-13 MeV. The product branching fraction is determined to be Bf(B-->KZ(4430))xBf(Z(4430)-->pi^+psi') = (4.1+-1.0(stat)+-1.4(syst))x10^{-5), where Z(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5sigma. These results are obtained from a 605 fb-1 data sample that contains 657 million BBbar pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider.
Belle Collaboration
Choi Sang-Kyung
Olsen Stephen Lars
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