CP violation in a light Higgs boson decay from tau-spin correlations at a linear collider

Abstract

We present a new method to measure the transverse spin correlation in the $H\to {\tau }^{+}{\tau }^{-}$ decay. The method has been devised to be insensitive to the beamstrahlung which affects the definition of the beam energy at a linear collider. In the case of two $\tau \to {\pi }^{\nu }$ decays, using the anticipated detector performance of the TESLA project, we get a promising estimation of the error expected on the measurement of a CP violating phase.

10 pages, 4 figures, version published in Phys. Lett. B

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