Measurement of the Michel parameters (η ‾, ξκ) in the radiative leptonic decay of τ
user-5f8411ab4c775e9685ff56d3(2017)
Abstract
Abstract We present the first measurement of the Michel parameters η ‾ and ξκ in the radiative leptonic decay of the τ lepton using 703 fb-1 of data collected with the Belle detector at the KEKB e + e − collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e + e − → τ + τ − → ( π + π 0 ν ‾ ) ( l − ν ν ‾ γ ) ( l = e or μ ) . The preliminary values of the measured Michel parameters are η ‾ = − 2.0 ± 1.5 ± 0.8 and ξ κ = 0.6 ± 0.4 ± 0.2 , where the first error is statistical and the second is systematic.
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Key words
Michel parameters,Lepton,KEKB,Electron–positron annihilation,Radiative transfer,Collider,Particle physics,Nuclear physics,Physics,Maximum likelihood,Statistical analysis
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