Search for the decay η′ →γγη

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Abstract

Using a data sample of 1.31×109 J/ψ events collected with the BESIII detector, a search for η′→γγη via J/ψ→γη′ is performed for the first time. No significant η′ signal is observed in the γγη invariant mass spectrum, and the branching fraction of η′→γγη is determined to be less than 1.33×10-4 at the 90% confidence level.

Original languageEnglish (US)
Article number052015
JournalPhysical Review D
Volume100
Issue number5
DOIs
StatePublished - Sep 30 2019

Bibliographical note

Funding Information:
The BESIII collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. 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. 11625523, No. 11635010, No. 11675184, No. 11735014, No. 11835012; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1532257, No. U1532258, No. U1732263, No. U1832207; CAS Key Research Program of Frontier Sciences under Contracts No. QYZDJ-SSW-SLH003, No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contracts No. Collaborative Research Center CRC 1044, FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contract No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0010118, No. DE-SC-0012069; University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt.

Funding Information:
Using a data sample of 1.31 × 10 9   J / ψ events collected with the BESIII detector, a search for η ′ → γ γ η via J / ψ → γ η ′ is performed for the first time. No significant η ′ signal is observed in the γ γ η invariant mass spectrum, and the branching fraction of η ′ → γ γ η is determined to be less than 1.33 × 10 - 4 at the 90% confidence level. BEPCII Key Laboratory of Particle Astrophysics, Institute of High Energy Physics 10.13039/501100002856 National Key Basic Research Program of China 10.13039/501100012166 2015CB856700 National Natural Science Foundation of China 10.13039/501100001809 11625523 11635010 11675184 11735014 11835012 Chinese Academy of Sciences 10.13039/501100002367 U1532257 U1532258 U1732263 U1832207 CAS Key Research Program of Frontier Sciences QYZDJ-SSW-SLH003 QYZDJ-SSW-SLH040 100 Talents Program of CAS INPAC Shanghai Key Laboratory for Particle Physics and Cosmology Deutsche Forschungsgemeinschaft 10.13039/501100001659 CRC 1044 FOR 2359 Instituto Nazionale di Fisica Nucleare 10.13039/501100004007 Koninklijke Nederlandse Akademie van Wetenschappen 10.13039/501100001722 530-4CDP03 Ministry of Development of Turkey DPT2006K-120470 National Science and Technology fund Knut och Alice Wallenbergs Stiftelse 10.13039/501100004063 2016.0157 Royal Society 10.13039/501100000288 DH160214 Vetenskapsrådet 10.13039/501100004359 U.S. Department of Energy 10.13039/100000015 DE-FG02-05ER41374 DE-SC-0010118 DE-SC-0012069 Rijksuniversiteit Groningen 10.13039/501100001721 Helmholtzzentrum fuer Schwerionenforschung GmbH 10.13039/501100010958

Publisher Copyright:
© 2019 authors. Published by the American Physical Society.

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