Transverse Spin Polarization of ${\tau }^{-}$ in ${\bar{B}}^0\to D^{+}{\tau }^{-}\bar{\nu }$ and Charged Higgs Boson

Abstract

The spin of the $\tau$ lepton in the semiletonic process ${\bar{B}}^0\to D^{+}{\tau }^{-}\bar{\nu }$ can be polarized in the direction which is normal to the reaction plane, if the charged Higgs boson exists and its coupling to quarks has a complex phase. We calculate this transverse polarization of the $\tau$ lepton by using the experimentally measured $B$ to $D$ transition form factors.

arXiv comment10 pages, 7 figures, 4 references are added

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