https://doi.org/10.1140/epjc/s10052-018-5701-8
Regular Article - Theoretical Physics
Rare top quark decays at a 100 TeV proton–proton collider: 
and 
1
Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
2
Nikhef, Theory Group, Science Park 105, 1098 XG, Amsterdam, The Netherlands
* e-mail: apapaefs@nikhef.nl
Received:
11
January
2018
Accepted:
3
March
2018
Published online:
13
March
2018
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, 
, and flavour-changing neutral decay with a Higgs boson, 
, the former being kinematically suppressed with a branching ratio of 
(Altarelli et al., Phys Lett B 502:125–132, 2001), and the latter highly loop-suppressed, with a branching ratio of 
(Aguilar-Saavedra, Acta Phys Polon B 35:2695–2710, 2004). We find that will be very challenging to observe in top quark pair production, even within well-motivated beyond-the-standard model scenarios. For the mode 
we find a stronger sensitivity than that obtained by any future LHC measurement by at least one order of magnitude.
© The Author(s), 2018
