Journal article
Measurement of the branching ratio for D−s→τ−ν̄τ decays
OPAL Collaboration, G Abbiendi, C Ainsley, PF Åkesson, G Alexander, J Allison, G Anagnostou, KJ Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, AH Ball, E Barberio, RJ Barlow, RJ Batley, T Behnke, KW Bell, G Bella Show all
Physics Letters B | Elsevier | Published : 2001
Abstract
Using about 3.9 million hadronic Z decays from e+e− collisions recorded by the OPAL detector at LEP at centre-of-mass energies s≈MZ, the branching ratio for the decay D−s→τ−ν̄τ has been measured to be BR(D−s→τ−ν̄τ)=(7.0±2.1(stat)±2.0(syst))%. This result can be used to derive the decay constant of the D−s meson: fDs=(286±44(stat)±41(syst))MeV.