Constraining New Physics with Possible Dark Matter Signatures from a Global CKM Fit

TL;DR

This paper uses a global CKM fit to constrain a new physics model with potential dark matter signatures, updating parameters with recent inputs and analyzing implications for dark matter phenomenology.

Contribution

It introduces updated CKM fit results incorporating new physics effects and lattice form factors, providing tight constraints on dark matter-related parameters.

Findings

Tight constraints on new physics parameters affecting dark matter models.

Updated CKM and Wolfenstein parameters with recent inputs.

Implications for dark matter phenomenology and other studies.

Abstract

We constrain the parameters of a representative new physics model with possible dark matter (DM) signature from a global CKM fit analysis. The model has neutral quark current interactions mediated by a scalar, impacting the semileptonic and purely leptonic meson decays at one-loop. We take this opportunity to update the fit results for the Wolfenstein parameters and the CKM elements with and without a contribution from the new model using several other updated inputs. Alongside, we have analyzed and included in the CKM fit the $B\to D^*\ell\nu_{\ell}$ decay. The newly available inputs on the relevant form factors from lattice are included, and the possibility of new physics effects in $B\to D^*\ell\nu_{\ell}$ is considered. We obtain tight constraints on the relevant new physics parameters. We have studied the possible implications of this constraint on DM phenomenology. Apart from DM, the bounds are also applicable in other relevant phenomenological studies.