Abstract
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 → πν\( \bar \nu \), B → πν\( \bar \nu \), and B → Kν\( \bar \nu \) decays are investigated. It is shown 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 in future experiments will allow for the observation of the contributions of the new quark or to impose stronger constraints on its mass.
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Kopnin, P.N., Vysotsky, M.I. Manifestation of a singlet heavy up-type quark in the branching ratios of rare decays K → πν\( \bar \nu \), B → πν\( \bar \nu \), and B → Kν\( \bar \nu \) . Jetp Lett. 87, 517–523 (2008). https://doi.org/10.1134/S0021364008100019
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DOI: https://doi.org/10.1134/S0021364008100019