Measurement of the Absolute Branching Fraction for Λ_c⁺ → Λμ⁺ν_μ
Date
2018-06-01
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Abstract
We report the first measurement of the absolute branching fraction for Λ_c⁺ → Λμ⁺ν_μ. This measurement is based on a sample of e⁺e⁻ annihilation data produced at a center-of-mass energy √s̅ = 4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb⁻¹. The branching fraction is determined to be ℬ(Λ_c⁺ → Λμ⁺ν_μ) = (3.49 ± 0.46(stat) ± 0.27(syst))%. In addition, we calculate the ratio ℬ(Λ_c⁺ → Λμ⁺ν_μ) / ℬ(Λ_c⁺ → Λe⁺ν_e) to be 0.96 ± 0.16(stat) ± 0.04(syst).
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Branching fractions (Nuclear physics), Causality (Physics), Baryons, Quarks, Electron-positron interactions
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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. 11235005, 11235011, 11305090, 11322544, 11305180, 11335008, 11425524, 11505010; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U1232201, U1332201; CAS under Contracts Nos. KJCX2-YW-N29, KJCX2-YW-N45; German Research Foundation DFG under Contracts Nos. Collaborative Research Center CRC 1044, FOR 2359; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contract No. U1532257; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contract No. U1532258; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; Ministry of Development of Turkey under Contract No. DPT2006K-120470; NSFC under Contract No. 11275266; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374, DE-SC-0010504, DE-SC0012069, DESC0010118; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0. This paper is also supported by the Beijing municipal government under Contracts Nos. KM201610017009, 2015000020124G064.
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CC BY 4.0 (Attribution), ©2017 The Authors