We present the first search for the rare decay of η′ into K±π in J/ψ→φη′, using a sample of 1.3×109 J/ψ events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90% confidence level for the ratio B(η′→K±π)B(η′→γπ+π-) is determined to be 1.3×10-4. In addition, we report the measurement of the branching fraction of J/ψ→φη′ to be [5.10±0.03(stat)±0.32(syst)]×10-4, which agrees with previous results from BESII.
Bibliographical noteFunding Information:
This work is supported in part by the National Key Basic Research Program of China under Contract No.2015CB856700; the National Natural Science Foundation of China (NSFC) under Contracts No.11125525, No.11235011, No.11322544, No.11335008, No.11425524, No.11105101, No.11205117, No.11575133, and No.11175189; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); the Collaborative Innovation Center for Particles and Interactions (CICPI); the Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No.11179007, No.U1232201, No.U1332201, and No.U1232109; CAS under Contracts No.KJCX2-YW-N29 and No.KJCX2-YW-N45; the 100 Talents Program of CAS; the National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; the German Research Foundation DFG under Contract No.Collaborative Research Center CRC-1044; the Istituto Nazionale di Fisica Nucleare, Italy; the Ministry of Development of Turkey under Contract No.DPT2006K-120470; the Russian Foundation for Basic Research under Contract No.14-07-91152; the Swedish Research Council; the U.S. Department of Energy under Contracts No.DE-FG02-04ER41291, No.DE-FG02-05ER41374, No.DE-FG02-94ER40823, and No.DESC0010118; the U.S. National Science Foundation; the University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and the WCU Program of the National Research Foundation of Korea under Contract No.R32-2008-000-10155-0.
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