New Physics effects with right-handed neutrinos in semileptonic decay $B_c^+ \to B_s \mu^+ \nu_{\mu}$

TL;DR

This paper explores how right-handed neutrinos and new physics operators could influence semileptonic B_c+ decay, using experimental data to constrain models and predict observable effects for future experiments.

Contribution

It introduces a comprehensive effective Hamiltonian including right-handed neutrinos for charm quark transitions and analyzes their impact on B_c+ decay observables.

Findings

New physics scenarios significantly affect decay observables.

Experimental data constrains new physics Wilson coefficients.

Future measurements can help identify the structure of new physics.

Abstract

We extend the Standard Model with the general effective Hamiltonian for the quark level transition $c \to s \ell \nu$ with a complete set of four fermion operators including right-handed neutrinos. The current experimental measurements in charm decays are compatible with the Standard Model predictions and are used to constrain the new physics. With the available experimental data, we fit a $\chi^2$ function to get the best-fit values of the NP WCs. We investigate the impact of allowed new physics in the observables such as differential branching fraction, forward-backward asymmetry, lepton polarization asymmetry, and convexity parameter in the semileptonic decay $B_c^+ \to B_s \mu^+ \nu_{\mu}$. The different types of new physics scenarios have significant effects on these considered observables. The future experimental information of these observables can help to disentangle the structure of new physics.