Journal
PHYSICAL REVIEW D
Volume 87, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.012009
Keywords
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Funding
- Ministry of Science and Technology of China [2009CB825200]
- National Natural Science Foundation of China (NSFC) [10625524, 10821063, 10825524, 10835001, 10935007, 11125525, 11061140514]
- National Natural Science Foundation of China [11079008, 11179007, 11179014]
- Chinese Academy of Sciences (CAS)
- CAS [KJCX2-YW-N29, KJCX2-YW-N45]
- CAS
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- U.S. Department of Energy [DE-FG02-04ER41291, DE-FG02-91ER40682, DE-FG02-94ER40823]
- U.S. National Science Foundation
- University of Groningen (RuG)
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- WCU Program of National Research Foundation of Korea [R32-2008-000-10155-0]
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Using a sample of (225.3 +/- 2.8) x 10(6) J/psi decays collected with the BESIII detector at BEPCII, searches for invisible decays of eta and eta ' in J/psi -> phi eta and phi eta ' are performed. Decays of phi -> K+K- are used to tag the eta and eta ' decays. No signals above background are found for the invisible decays, and upper limits at the 90% confidence level are determined to be 2.6 x 10(-4) for the ratio B(eta -> invisible)/B(eta ->gamma gamma) and 2.4 x 10(-2) for B(eta '-> invisible)/B(eta '->gamma gamma). These limits may be used to constrain light dark matter particles or spin-1 U bosons. DOI: 10.1103/PhysRevD.87.012009
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