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Observation of a Resonancelike Structure in the π^+-Ψ' Mass Distribution in Exclusive B → Kπ^+-Ψ' Decays (2008)

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 Γ= 45\begin+18\\-13\end(stat)\begin+30\\-13\end(syst)MeV.The product branching fraction is determined to be B(B^0→ K^∓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 ×10^6 B\bar{B} pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e^+e^- collider.. PHYSICAL REVIEW LETTERS. v.100, n.14, 2008, p.142001-1-142001-6

Publication details
Download http://dx.doi.org/10.1103/PhysRevLett.100.142001
http://hdl.handle.net/2237/11344
Publisher American Physical Society
Repository AKF OAI-PMH Repository (Japan)
Keywords 000
Type 研究成果-論文以外
Language eng