Wednesday, March 1, 2017
The talk will be based upon my recent study arXiv:1608.07282 and I will also cover some of my ongoing work related to the SM Higgs. The heavy scalar resonance search channel of gg→S→tt is very challenging, caused by a large destructive interference with the SM background. We analyze the line shapes of heavy scalars in several well-motivated beyond the standard model physics models. Commonly existing additional contributions to the glu-glu-scalar coupling change the relative phases of the signal and background amplitudes, inducing new opportunities in this channel. We further outline various methods to improve the LHC search in this channel. The strong phase could also play important role in some Higgs searches, and I will discuss the corresponding phenomenology.