Precision Measurement of the D*⁰ Decay Branching Fractions


Using 482 pb⁻¹ of data taken at √s = 4.009 GeV, we measure the branching fractions of the decays of D⁰ into D⁰π⁰ and D⁰γ to be ℬ(D⁰ → D⁰π⁰) = (65.5 ± 0.8 ± 0.5)% and ℬ(D⁰ → D⁰γ) = (34.5 ± 0.8 ± 0.5)%, respectively, by assuming that the D⁰ decays only into these two modes. The ratio of the two branching fractions is ℬ(D⁰ → D⁰π⁰) / ℬ(D⁰ → D⁰γ) = 1.90 ± 0.07 ± 0.05, which is independent of the assumption made above. The first uncertainties are statistical and the second ones systematic. The precision is improved by a factor of 3 compared to the present world average values.



Branching fractions (Nuclear physics), D Mesons, Uncertainty, Mesons--Decay

National Key Basic Research Program of China under Contract No. 2015CB856700; Joint Funds of the National Natural Science Foundation of China under Contracts No. 11079008, No. 11179007, No. U1232201, and No. U1332201; National Natural Science Foundation of China (NSFC) under Contracts No. 10935007, No. 11121092, No. 11125525, No. 11235011, No. 11322544, and No. 11335008; the Chinese Academy of Sciences (CAS) under Contracts No. KJCX2-YW-N29 and No. KJCX2-YW-N45; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Ministry of Development of Turkey under Contract No. DPT2006 K-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-FG02-94ER40823, and No. DESC0010118; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.


©2015 American Physical Society