Manifestation of a singlet heavy up-type quark in the branching ratios of rare decays K to \pi \nu \bar{\nu}, B to \pi \nu \bar{\nu} and B to K \nu \bar{\nu}

TL;DR

This paper explores how a hypothetical heavy singlet up-type quark could alter the branching ratios of certain rare meson decays, with potential deviations up to 10% from Standard Model predictions, informing future experimental constraints.

Contribution

It introduces a model with a heavy singlet up-type quark and analyzes its impact on rare decay branching ratios, providing predictions for deviations from the Standard Model.

Findings

Deviations up to 10% in decay branching ratios for a 5 TeV quark.

Future measurements can detect or constrain the heavy quark's effects.

The model offers a way to test new physics beyond the Standard Model.

Abstract

We investigate the implications of the model with a SU(2)-singlet up-type quark, heavy enough not to be produced at the LHC, namely, the contribution of the new quark to the branching ratios of the K to \pi \nu \bar{\nu}, B to \pi \nu \bar{\nu} and B to K \nu \bar{\nu} decays. We show that the deviation from the Standard Model can be up to 10% in the case of a 5 TeV quark. Precise measurements of these branching ratios at the future experiments will allow to observe the contributions of the new quark or to impose stronger constraints on its mass.