Right-handed interactions in puzzling $B$-decays

TL;DR

This paper proposes a new physics explanation involving right-handed interactions and an extra neutral lepton to account for discrepancies in B-decay measurements, within a scalar leptoquark model.

Contribution

It introduces a model with right-handed interactions and a neutral lepton to explain anomalies in B-decay widths, extending the Standard Model with a scalar leptoquark.

Findings

Consistent explanation for decay width discrepancies

Predictions for new particles and interactions

Phenomenological implications of the scalar leptoquark

Abstract

We explain the difference between the measured decay widths of $b \to c \tau \nu$ processes and of $B\to K\nu\bar{\nu}$ and their values predicted in the Standard Model by introducing the right-handed interactions both to quarks and to leptons. At low energy scales, in addition to the Standard Model particles, we assume the presence of an additional neutral lepton (right-handed neutrino). We then show a specific realization of such a scenario in a model with a single scalar leptoquark ($S_1$), and discuss the corresponding phenomenology.