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VOLUME 87 (2008) | ISSUE 10 | PAGE 605
Manifestation of a singlet heavy up-tupe quark in the branching ratios of rare decays \boldsymbol{K\rightarrow\pi\nu\bar{\nu}}, \boldsymbol{B\rightarrow\pi\nu\bar{\nu}} and \boldsymbol{B\rightarrow K\nu\bar{\nu}}
PACS: 12.15.-y, 12.60.-i, 13.20.-v
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 \rightarrow \pi \nu \bar{\nu}, B\rightarrow \pi \nu \bar{\nu} and B \rightarrow 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.