Study of Michel parameters in leptonic $\tau$ decays at Belle
Study of Michel parameters in leptonic $\tau$ decays at Belle
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发表时间:
2014-09
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通讯作者:
T. B. Collaboration
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作者:
T. B. Collaboration
We present a study of Michel parameters in leptonic $\tau$ decays using experimental information collected at the Belle detector. Michel parameters are extracted in the unbinned maximum likelihood fit of the $(\tau^\mp\to\ell^\mp\nu\nu,\tau^\pm\to\pi^\pm\pi^0\nu)$ events in the full nine-dimensional phase space. We exploit the spin-spin correlation of tau leptons to extract $\xi_\rho\xi$ and $\xi_\rho\xi\delta$ in addition to the $\rho$ and $\eta$ parameters.