Abstract
Exotic decays of top partners in new bosons are the norm in realistic models of a composite Higgs. We focus on the custodial charge-5/3 partner, which normally decays exclusively into tW+. The new channels include a colour-sextet, X5/3→ overline{b} π6, as well as singly and doubly charged scalars, X5/3→ t\U0001d719+, b\U0001d719++. We use existing same-sign lepton searches to show that the new final states are constrained at the same level as the standard one. At the same time, exotic final states also offer opportunities for improvement: examples include a hard photon in X5/3→ t\U0001d719+→ tW+γ decays, and top-rich channels which arises in several exotic X5/3 decays.
Highlights
Searches for X5/3 constitute an important part of the ATLAS [8, 9] and CMS [10] search programs
We study how the bounds on the X5/3 mass are modified in presence of the new decay channels, which are theoretically motivated by realistic composite Higgs models
We have focused our attention on the decays of the custodial charge 5/3 partner X5/3, which has only one possible decay into a Standard Model (SM) final state, X5/3 → tW +
Summary
The expected (i.e. Monte Carlo) bounds are rather similar for those two channels: 1.19 TeV for the SSL and 1.23 TeV for SLj, implying that the two channels have almost the same sensitivity to the X5/3X5/3 → tW +tW − final state. Both search strategies apply to the exotic X5/3 decays, the kinematics and the particle multiplicities are modified.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
