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論文

Measurement of the $$tau$$ Michel parameters $$bar{eta}$$ and $$xikappa$$ in the radiative leptonic decay $$tau^- rightarrow ell^- nu_{tau} bar{nu}_{ell}gamma$$

清水 信宏*; 谷田 聖; Belle Collaboration*; 他169名*

Progress of Theoretical and Experimental Physics (Internet), 2018(2), p.023C01_1 - 023C01_26, 2018/02

AA2018-0510.pdf:1.89MB

 被引用回数:6 パーセンタイル:54.68(Physics, Multidisciplinary)

We present a measurement of the Michel parameters of the $$tau$$ lepton, $$bar{eta}$$ and $$xikappa$$, in the radiative leptonic decay $$tau^- rightarrow ell^- nu_{tau} bar{nu}_{ell} gamma$$ using 711~f$$mathrm{b}^{-1}$$ of collision data collected with the Belle detector at the KEKB $$e^+e^-$$ collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of $$e^+e^-rightarrowtau^+tau^-rightarrow (pi^+pi^0 bar{nu}_tau)(ell^-nu_{tau}bar{nu}_{ell}gamma)$$ $$(ell=e$$ or $$mu)$$. The measured values of the Michel parameters are $$bar{eta} = -1.3 pm 1.5 pm 0.8$$ and $$xikappa = 0.5 pm 0.4 pm 0.2$$, 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.

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