Study of χcJ decaying into K∗ (892) K ¯

M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, M. Bertani, D. Bettoni, J. M. Bian, F. Bianchi, E. Boger, O. BondarenkoI. Boyko, R. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, H. Y. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, G. Cibinetto, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, A. Dbeyssi, D. Dedovich, Z. Y. Deng, H. Muramatsu, R. Poling, BESIII Collaboration

Research output: Contribution to journalArticle

10 Scopus citations

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 χcJ→ΦKS0K±π∓ and χcJ→ΦK+K-π0 in the E1 radiative transition ψ(3686)→γχcJ. The decays are dominated by the three-body decay χcJ→K∗(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.

Original languageEnglish (US)
Article number112008
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number11
DOIs
StatePublished - Jun 16 2015

    Fingerprint

Cite this

Ablikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., ... BESIII Collaboration (2015). Study of χcJ decaying into K∗ (892) K ¯. Physical Review D - Particles, Fields, Gravitation and Cosmology, 91(11), [112008]. https://doi.org/10.1103/PhysRevD.91.112008