Two Higgs Doublets, a 4th Generation and a 125 GeV Higgs: A Review

Figure 20

The 95% CL exclusion plot distribution on the 𝑡^′ mass assuming the SM4 signature in the semileptonic channel (^{1ℓ+𝑛𝑗+𝐸}/_𝑇). For the case of background only, the red dotted line is the median and the yellow and green bands are the ±1 and ±2 standard deviations accordingly. The black line is the median for background + 𝑡^′𝑡^′→2𝑏+6𝑊 with 𝑚_𝑡′=450 GeV and the blue line is the median for background + 𝑡^′𝑡^′→6𝑏+2𝑊 with 𝑚_𝑡′=350 GeV. The curves for the 4G2HDMI signatures with 𝑚_𝑡′=350−−450 GeV lie between these two lines. Figure taken from [149].