Measurement of χ_{cJ} Decaying into η'K⁺K⁻


Using (106.41 ± 0.86) × 106 ψ(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay χcJ → η'K+K- (J = 1, 2), where η' → γρ0 and η' → ηπ+π-. A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay χc1 → η'K+K-. Intermediate processes χc1 → η' f0 (980), χc1 → η' f0 (1710), χc1 → η' f2' (1525) and χc1 → K∗ 0 (1430)± K∓ (K∗ 0 (1430)± → η' K±) are observed with statistical significances larger than 5σ, and their branching fractions are measured.



Branching fractions (Nuclear physics), Atomic mass, Photons, Uncertainty, Angular distribution (Nuclear physics), Kaons

This work is supported in part by the Ministry of Science and Technology of China under Contract No. 2009CB825200; Joint Funds of the National Natural Science Foundation of China under Contracts No. 11079008, No. 11179007, No. U1332201; National Natural Science Foundation of China (NSFC) under Contracts No. 10625524, No. 10821063, No. 10825524, No. 10835001, No. 10935007, No. 10979038, No. 11005109, No. 11079030, No. 11125525, No. 11235011, No. 11275189, No. 11322544, No. 11375204; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45; 100 Talents Program of CAS; German Research Foundation DFG under Contract No.Collaborative ResearchCenter CRC-1044; Ministry of Development of Turkey under Contract No. DPT2006 K- 120470; U.S. Department of Energy under Contracts No. DEFG02- 04ER41291, No. DE-FG02-05ER41374, No. DEFG02- 94ER40823, No. DESC0010118; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.


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