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Measurement of the tau Michel parameters ηˉ\bar{\eta} and ξκ\xi\kappa in the radiative leptonic decay τ−→ℓ−ντνˉℓγ\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell}\gamma

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Sep 26, 2017
28 pages
Published in:
  • PTEP 2018 (2018) 2, 023C01
  • Published: Feb 1, 2018
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Abstract: (arXiv)
We present a measurement of the Michel parameters of the τ\tau lepton, ηˉ\bar{\eta} and ξκ\xi\kappa, in the radiative leptonic decay τ−→ℓ−ντνˉℓγ\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell} \gamma using 711~fb−1\mathrm{b}^{-1} of collision data collected with the Belle detector at the KEKB e+e−e^+e^- collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e+e−→τ+τ−→(π+π0νˉτ)(ℓ−ντνˉℓγ)e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0 \bar{\nu}_\tau)(\ell^-\nu_{\tau}\bar{\nu}_{\ell}\gamma) (ℓ=e(\ell=e or μ)\mu). The measured values of the Michel parameters are ηˉ=−1.3±1.5±0.8\bar{\eta} = -1.3 \pm 1.5 \pm 0.8 and ξκ=0.5±0.4±0.2\xi\kappa = 0.5 \pm 0.4 \pm 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties and constrain the coupling constants of the generalized weak interaction.
  • C01 Electroweak model, Higgs bosons, electroweak symmetry breaking
  • C07 Particle properties
  • C21 Lepton collider experiments
  • electron positron: annihilation
  • electron positron: colliding beams
  • tau: radiative decay
  • error: statistical
  • Michel parameter
  • tau: leptonic decay
  • weak interaction
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