# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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Mexico City -

# New physics and the tau polarization vector in $b\to c \tau \bar\nu_\tau$ ​decays

## Speakers

• Neus PENALVA MARTINEZ

## Abstract

For a general $H_b\to H_c\tau\bar{\nu}$ decay we analyze the role of the $\tau$ polarization vector in the context of LFU violation studies. We use a general phenomenological that includes several new physics terms. We show that both in the laboratory frame and in the center of mass, a $\mathcal{P}$ component is only possible for complex Wilson coefficients. We make specific evaluations of the polarization vector components for some decays, specially for $\Lambda_b\to \Lambda_c$ transitions.