Observation of h 1 ( 1380 ) in the J / ψ → η ′ K K ¯ π decay

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, P. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. G.; Gao, Z.; Garzia, I.; Goetzen, K.; Gong, L.; Gong, W. 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doi:10.1103/PhysRevD.98.072005

Title: Observation of $h_{1} (1380)$ in the $J / ψ \to η^{'} K \bar{K} π$ decay

Journal Article · Thu Oct 18 00:00:00 EDT 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.98.072005· OSTI ID:1478601

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E. more »

Using 1.31×10⁹ J/ψ events collected by the BESIII detector at the BEPCII e+e– collider, we report the first observation of the h1(1380) in J/ψ→η'h₁(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c² and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η'h₁(1380))×B(h1(1380)→K*(892)+K–+c.c.)=(1.51±0.09±0.21)×10^–4 in η'K+K–π⁰ mode and B(J/ψ→η'h₁(1380))×B(h₁(1380)→K*(892)¯K+c.c.)=(2.16±0.12±0.29)×10^–4 in η'K⁰_SK^±π^∓ mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h₁(1380)→K*(892)+K–+c.c. and h1(1380)→K*(892)⁰¯K⁰+c.c. As a result, based on the measured h₁(1380) mass, the mixing angle between the states h₁(1170) and h₁(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.

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Research Organization:: The George Washington Univ., Ashburn, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC0010118; SC0010504; SC0012069; SC0016583

OSTI ID:: 1478601

Alternate ID(s):: OSTI ID: 1478665

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 98 Journal Issue: 7; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Title: Observation of $h_{1} (1380)$ in the $J / ψ \to η^{'} K \bar{K} π$ decay