Observation of the Isospin-Violating Decay J/ψ → φπ⁰ f₀(980)

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Observation of the Isospin-Violating Decay J/ψ → φπ⁰ f₀(980)

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Title: Observation of the Isospin-Violating Decay J/ψ → φπ⁰ f₀(980)
Author(s):
Ablikim, M.;
Achasov, M. N.;
Ai, X. C.;
Albayrak, O.;
Albrecht, M.;
Ambrose, D. J.;
Amoroso, A.;
Lou, Xinchou (UT Dallas);
BESIII Collaboration
Item Type: Article
Keywords: Show Keywords
Abstract: Using a sample of 1.31 x 10⁹ J/ψ events collected with the BESIII detector at the BEPCII collider, the decays J/ψ → φπ⁺π⁻π⁰ and J/ψ → φπ⁰π⁰π⁰ are investigated. The isospin-violating decay J/ψ → φπ⁰f₀(980) with f₀(980) → ππ is observed for the first time. The width of the f₀(980) obtained from the dipion mass spectrum is found to be much smaller than the world average value. In the π⁰f₀(980) mass spectrum, there is evidence of f₁(1285) production. By studying the decay J/ψ → φη', the branching fractions of η' → π⁺π⁻π⁰ and η' →π⁰π⁰π⁰, as well as their ratio, are also measured.
Publisher: Amer Physical Soc
ISSN: 1550-7998
Persistent Link: http://hdl.handle.net/10735.1/5163
http://dx.doi.org/10.1103/PhysRevD.92.012007
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Observation of the isospin-violating decay J/ψ → φπ⁰ f₀(980)." Physical Review D 92(1), doi: 10.1103/PhysRevD.92.012007
Terms of Use: ©2015 American Physical Society
Sponsors: This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11125525, No. 11235011, No. 11322544, No. 11335008, and No. 11425524; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. U1232201, and No. U1332201; CAS under Contracts No. KJCX2-YW-N29 and No. KJCX2-YW-N45; German Research Foundation DFG under Collaborative Research Center Contract No. CRC-1044; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; U.S. Department of Energy under Contracts No. DE-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-FG02-94ER40823, and No. DESC0010118; and WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.

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