期刊
PHYSICS LETTERS B
卷 774, 期 -, 页码 252-257出版社
ELSEVIER
DOI: 10.1016/j.physletb.2017.09.067
关键词
Dark photon search; Initial state radiation; BESIII
资金
- National Key Basic Research Program of China [2015CB856700]
- National Natural Science Foundation of China (NSFC) [11235011, 11335008, 11425524, 11625523, 11635010]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- CAS Center for Excellence in Particle Physics (CCEPP)
- Joint Large-Scale Scientific Facility Fund of the NSFC
- Joint Large-Scale Scientific Facility Funds of the CAS [U1332201, U1532257, U1532258, KJCX2-YW-N29, KJCX2-YW-N45, QYZDJ-SSW-SLH003]
- 100 Talents Program of CAS
- National 1000 Talents Program of China
- Shanghai Key Laboratory for Particle Physics and Cosmology
- German Research Foundation DFG [CRC 1044, FOR 2359]
- Istituto Nazionale di Fisica Nucleare, Italy
- Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) [530-4CDP03]
- Ministry of Development of Turkey [DPT2006K-120470]
- National Science and Technology fund
- Swedish Resarch Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0010118, DE-SC-0010504, DE-SC-0012069]
- University of Groningen (RuG)
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- WCU Program of National Research Foundation of Korea [R32-2008-000-10155-0]
- INPAC
Using a data set of 2.93 fb taken at a center-of-mass energy root s = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions e(+)e(-) -> e(+)e(-) gamma(ISR) and e(+)e(-) -> mu(+)mu(-) gamma(ISR) for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic pairs. We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/c(2) and set a 90% confidence level upper limit on the mixing strength of the dark photon and the Standard Model photon. We obtain a competitive limit in the tested mass range. (c) 2017 The Author(s). Published by Elsevier B.V.
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