Observation of the Singly Cabibbo-Suppressed Decay D⁺ → ωπ⁺ and Evidence for D⁰ → ωπ⁰



Based on 2.93 fb⁻¹ e⁺e⁻ collision data taken at center-of-mass energy of 3.773 GeV by the BESIII detector, we report searches for the singly Cabibbo-suppressed decays D⁺ → ωπ⁺ and D⁰ → ωπ⁰. A double tag technique is used to measure the absolute branching fractions B(D⁺ → ωπ⁺) = (2.79 ± 0.57 ± 0.16) x 10⁻⁴ and B(D⁰ → ωπ⁰) = (1.17 ± 0.34 ± 0.07) x 10⁻⁴, with statistical significances of 5.5σ and 4.1σ, where the first and second uncertainties are statistical and systematic, respectively.



Branching fractions (Nuclear physics), Center of mass, Uncertainty, Kaons, Mesons


This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11125525, No. 11235011, No. 11322544, No. 11335008, No. 11425524; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. 10975093, No. U1232201, No. U1332201; CAS under Contracts No. KJCX2-YWN29, No. KJCX2-YW-N45; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Joint Funds of the National Science Foundation of China under Contract No. U1232107; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; U.S. Department of Energy under Contracts No. DE-FG02-04ER41291, No. DE-FG02-05ER41374, No. DE-SC0012069, No. DESC0010118; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.


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