期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.092001
关键词
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资金
- Ministry of Science and Technology of China [2009CB825200]
- National Natural Science Foundation of China (NSFC) [10625524, 10821063, 10825524, 10835001, 10935007, 11125525, 11235011]
- National Natural Science Foundation of China [11079008, 11179007]
- Chinese Academy of Sciences (CAS)
- CAS [KJCX2-YW-N29, KJCX2-YW-N45]
- German Research Foundation DFG [Collaborative Research Center CRC-1044]
- European Union [627240]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- U. S. Department of Energy [DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118]
- U.S. National Science Foundation
- University of Groningen (RuG)
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- WCU of the National Research Foundation of Korea [R32-2008-000-10155-0]
With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e(+)e(-) -> gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -> gamma X(3872)] and the branching fraction B [X(3872) -> pi(+)pi(-)J/psi] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) -> gamma X(3872).
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