Implications of scalar and tensor explanations of $R_{D^{(\ast)}}$

TL;DR

This paper explores how scalar and tensor operators proposed to explain anomalies in B-meson decays also affect tau magnetic moments and Higgs decays, providing new ways to test these theories.

Contribution

It presents a model-independent analysis linking $R_{D^{(*)}}$ anomalies with tau $g-2$ and Higgs decay, highlighting unavoidably induced effects and proposing experimental tests.

Findings

Scalar and tensor operators impact tau magnetic moments.

Connections between $R_{D^{(*)}}$ anomalies and Higgs decays are established.

Concrete models illustrating these effects are discussed.

Abstract

We investigate the implications of scalar and tensor operators proposed to accommodate the hints of lepton flavor universality violation in charged-current $B$-meson decays. We show that these scenarios unavoidably induce chirality enhanced contributions to charged lepton magnetic moments and Yukawa couplings. By using an effective field theory approach we quantify in a model independent way the connection of the $R_{D^{(\ast)}}$ anomaly with the tau $g-2$ and the Higgs decay $h\to \tau\tau$, which can offer an alternative to test these scenarios. Concrete New Physics models giving rise to our setup will be illustrated.