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

Figure 8

The “3+1” scenario, 𝑉_𝑡′𝑏=0.001 (|𝜆^𝑡′_𝑠𝑏|=10⁻⁵): the allowed parameter space in the 𝑚_𝐻⁺−tan𝛽 plane, following constraints from 𝐵→𝑋_𝑠𝛾 and 𝐵_𝑞−𝐵_𝑞 mixing, in the 4G2HDMI (a), the 4G2HDMII (b), and the 4G2HDMIII (c), for 𝑚_𝑡′=500 GeV,  𝑚_𝑏′=450 GeV,   𝜖_𝑏=𝑚_𝑏/𝑚_𝑏′,  and 𝜖_𝑡=0.34(∼𝑚_𝑡/𝑚_𝑡′). Figure taken from [61].

(a)

(b)

(c)