## Abstract

A distinct peak is observed in the π±ψ' invariant mass distribution near 4.43 GeV in B → Kπ^{±}ψ' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M = 4433 ± 4 (stat) ± 2 (syst) MeV and F = 45+18 -13 (stat)+30-13 (syst) MeV. The product branching fraction is determined to be B(B0 → K±Z^{±} (4430)) × B(Z±(4430) → π±ψ') = (4.1 ± 1.0(stat) ± 1.4(syst)) × 10-5, where Z±(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5σ. These results are obtained from a 605 fb-1 data sample that contains 657 million B ̄B pairs collected near the γ(4S) resonance with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} collider.

Original language | English |
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State | Published - 2007 |

Event | 23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007 - Daegu, Korea, Republic of Duration: 13 Aug 2007 → 18 Aug 2007 |

### Conference

Conference | 23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007 |
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Country/Territory | Korea, Republic of |

City | Daegu |

Period | 13/08/07 → 18/08/07 |

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