Top-quark decay into Upsilon-meson

Abstract

The calculation of the partial width of the rare t-quark decay into Υ-meson, W -boson and b-quark (t → ΥW b) is presented. The branching ratio equals Br(t → ΥW b) = 1.3 × 10 −5 that make possible searches for this rare t-quark decay at LHC.