Study of χcJ decaying into ϕK*(892)K¯

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. D 91, 112008 – Published 16 June 2015

Abstract

Using a data sample of 106 million ψ(3686) events collected with the BESIII detector operated at the BEPCII storage ring, we study for the first time the decays χcJϕKS0K±π and χcJϕK+Kπ0 in the E1 radiative transition ψ(3686)γχcJ. The decays are dominated by the three-body decay χcJϕK*(892)K¯. We measure branching fractions for this reaction via the neutral and charged K*(892) and find them consistent with each other within the expectation of isospin symmetry. In the KK¯π invariant mass distribution, a structure near the K*(892)K¯ mass threshold is observed, and the corresponding mass and width are measured to be 1412±4(stat)±8(sys)MeV/c2 and Γ=84±12(stat)±40(sys)MeV, respectively. The observed state favors an assignment to the h1(1380), considering its possible JPC and comparing its mass, width and decay mode to those reported in the Particle Data Group.

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  • Received 16 March 2015

DOI:https://doi.org/10.1103/PhysRevD.91.112008

© 2015 American Physical Society

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Vol. 91, Iss. 11 — 1 June 2015

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