Probing for extra top Yukawa couplings in light of the t(t)over-barh (125) observation
Journal
Physical Review D
Journal Volume
96
Journal Issue
1
Pages
75007
Date Issued
2017
Author(s)
Abstract
The observation of tt̄h(125) production at the Large Hadron Collider (LHC) is the first direct measurement of the top Yukawa coupling. It opens the window on an extra top Yukawa coupling, ρtt, from a second Higgs doublet, without a Z2 symmetry to forbid flavor changing neutral Higgs couplings. We show that tt̄h and Higgs property measurements at the High Luminosity LHC can constrain the Reρtt-Imρtt parameter space that could drive electroweak baryogenesis, but the Γh width measurement must be considerably improved beyond current projections.
Type
journal article