Measurement of ttH production in the diphoton channel and observation of heavy triboson production with the CMS detector in pp collisions at sβ=13Β TeV
We present two recent CMS results based on the full dataset of LHC Run 2. Decays of the Higgs boson to photons have been used to investigate the ttH process. A significance of 6.6 s.d. is achieved in this single channel. The product of cross section and branching fraction is measured to be 1.56β0.32+0.34β fb. The sample is used to investigate the CP structure the top Yukawa coupling, and a pure CP-odd structure is excluded at 3.2. s.d. . We also present the first observation of production of three massive vector bosons. Events with 3 - 6 isolated electrons or muons, or 2 same-sign leptons and 1 or 2 jets in the final state have been used to search for WWW, WWZ, WZZ, and ZZZ production. The combined significance reaches 5.7 s.d., with evidence for the individual WWW and WWZ channels. The combined signal strength is measured to be 1.02β0.23+0.26β.</p