Search for the rare decay η′ →π0π0π0π0 at BESIII

BESIII Collaboration

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Abstract

Using a sample of 1.31×109 J/ψ events collected with the BESIII detector, we perform a search for the rare decay η′→4π0 via J/ψ→γη′. No significant η′ signal is observed in the 4π0 invariant mass spectrum. With a Bayesian approach, the upper limit on the branching fraction is determined to be B(η′→4π0)<4.94×10-5 at the 90% confidence level, which is a factor of 6 smaller than the previous experimental limit.

Original languageEnglish (US)
Article number032001
JournalPhysical Review D
Volume101
Issue number3
DOIs
StatePublished - Feb 5 2020

Bibliographical note

Funding Information:
Using a sample of 1.31 × 10 9     J / ψ events collected with the BESIII detector, we perform a search for the rare decay η ′ → 4 π 0 via J / ψ → γ η ′ . No significant η ′ signal is observed in the 4 π 0 invariant mass spectrum. With a Bayesian approach, the upper limit on the branching fraction is determined to be B ( η ′ → 4 π 0 ) < 4.94 × 10 - 5 at the 90% confidence level, which is a factor of 6 smaller than the previous experimental limit. National Key Basic Research Program of China 10.13039/501100012166 2015CB856700 National Natural Science Foundation of China 10.13039/501100001809 11905179 11625523 11635010 11735014 11822506 11835012 Chinese Academy of Sciences 10.13039/501100002367 U1532257 U1532258 U1732263 U1832207 QYZDJ-SSW-SLH003 QYZDJ-SSW-SLH040 100 Talents Program INPAC Shanghai Key Laboratory for Particle Physics and Cosmology H2020 European Research Council 10.13039/100010663 758462 Foundation of Henan Educational Committee 10.13039/501100004609 19A140015 Young Scholars of Xinyang Normal University 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 Development Agency 10.13039/501100004192 Science and Technology Facilities Council 10.13039/501100000271 Knut och Alice Wallenbergs Stiftelse 10.13039/501100004063 2016.0157 Royal Society 10.13039/501100000288 DH140054 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

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. 11735014, No. 11822506, 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; the Institute of Nuclear and Particle Physics and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contracts No. Collaborative Research Center CRC 1044, No. 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; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts No. DH140054, 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.

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