Rare top quark decays at a 100 TeV proton–proton collider: $$t \rightarrow bWZ$$ t→bWZ and $$t\rightarrow hc$$ t→hc

Abstract We investigate extremely rare top quark decays at a future proton–proton collider with centre-of-mass energy of 100 TeV. We focus on two decay modes: radiative decay with a Z boson, $$t \rightarrow b WZ$$ t→bWZ , and flavour-changing neutral decay with a Higgs boson, $$t \rightarrow h c$$ t...

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Bibliographic Details
Main Authors: Andreas Papaefstathiou, Gilberto Tetlalmatzi-Xolocotzi
Format: Article
Language:English
Published: SpringerOpen 2018-03-01
Series:European Physical Journal C: Particles and Fields
Online Access:http://link.springer.com/article/10.1140/epjc/s10052-018-5701-8
Description
Summary:Abstract We investigate extremely rare top quark decays at a future proton–proton collider with centre-of-mass energy of 100 TeV. We focus on two decay modes: radiative decay with a Z boson, $$t \rightarrow b WZ$$ t→bWZ , and flavour-changing neutral decay with a Higgs boson, $$t \rightarrow h c$$ t→hc , the former being kinematically suppressed with a branching ratio of $${\mathscr {O}}(10^{-6})$$ O(10-6) (Altarelli et al., Phys Lett B 502:125–132, 2001), and the latter highly loop-suppressed, with a branching ratio of $${\mathscr {O}}(10^{-15})$$ O(10-15) (Aguilar-Saavedra, Acta Phys Polon B 35:2695–2710, 2004). We find that $$t \rightarrow b WZ$$ t→bWZ will be very challenging to observe in top quark pair production, even within well-motivated beyond-the-standard model scenarios. For the mode $$t\rightarrow h c$$ t→hc we find a stronger sensitivity than that obtained by any future LHC measurement by at least one order of magnitude.
ISSN:1434-6044
1434-6052