Observation of the Decay Λ_c⁺→ Σ⁻π⁺π⁺π⁰


We report the first observation of the decay Λ_c⁺→ Σ⁻π⁺π⁺π⁰, based on data obtained in e⁺e⁻ annihilations with an integrated luminosity of 567 pb⁻¹ at √s̅=4.6 GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λ_c⁺ → Σ⁻π⁺π⁺π⁰ is determined to be (2.11 ± 0.33(stat.) ± 0.14(syst.))%. In addition, an improved measurement of B( Λ_c⁺→ Σ⁻π⁺π⁺) is determined as (1.81 ± 0.17(stat.) ± 0.09(syst.))%.

Branching fractions (Nuclear physics), Baryons--Charm, Electron-positron interactions, Weak interactions (Nuclear physics), Luminescence
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 Nos. 11125525, 11235011,11275266, 11305180, 11322544, 11322544, 11335008, 11425524, 11505010; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1332201, U1532257, U1532258; CAS under Contracts Nos. KJCX2-YW-N29, KJCX2-YWN45, QYZDJ-SSW-SLH003; German Research Foundation DFG under Contracts Nos. Collaborative Research Center CRC 1044, FOR 2359; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; Ministry of Development of Turkey under Contract No. DPT2006K-120470; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374, DE-SC-0010118, DE-SC-0010504, DE-SC-0012069; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0. This paper is also supported by Beijing municipal government under Contract Nos. KM201610017009, 2015000020124G064, CIT&TCD201704047.
CC BY 4.0 (Attribution), © 2017 The Author(s)