Observation of a Resonancelike Structure in the $π^{+ -} ψ^{'}$ Mass Distribution in Exclusive $B \to K π^{+ -} ψ^{'}$ Decays

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8 April 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 100 (14) , 142001
https://doi.org/10.1103/physrevlett.100.142001

Abstract

A distinct peak is observed in the

π^{\pm} ψ^{'}

invariant mass distribution near 4.43 GeV in

B \to K π^{\pm} ψ^{'}

decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of

M = 4433 \pm 4 (stat) \pm 2 (syst) MeV

and

Γ = 45_{- 13}^{+ 18} (stat)_{- 13}^{+ 30} (syst) MeV

. The product branching fraction is determined to be

B (B^{0} \to K^{\mp} Z^{\pm} (4430)) \times B (Z^{\pm} (4430) \to π^{\pm} ψ^{'}) = (4.1 \pm 1.0 (stat) \pm 1.4 (syst)) \times 10^{- 5}

, where

Z^{\pm} (4430)

is used to denote the observed structure. The statistical significance of the observed peak is

6.5 σ

. These results are obtained from a

605 {fb}^{- 1}

data sample that contains

657 \times 10^{6}

B \bar{B}

pairs collected near the

Υ (4 S)

resonance with the Belle detector at the KEKB asymmetric energy

e^{+} e^{-}

collider.

Keywords

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This publication has 32 references indexed in Scilit:

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