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

Figure 11

The Cabibbo size mixing case, 𝑉_𝑡′𝑏=0.2 (|𝜆^𝑡′_𝑠𝑏|=0.004): the allowed parameter space in the tan𝛽−𝜖_𝑡 plane, following constraints from 𝐵→𝑋_𝑠𝛾 and 𝐵_𝑞−𝐵_𝑞 mixing, in the 4G2HDMI (a), 4G2HDMII (b), and 4G2HDMIII (c), for 𝑚_𝑡′=500 GeV,  𝑚_𝑏′=450 GeV,  and 𝜖_𝑏=𝑚_𝑏/𝑚_𝑏′ and with 𝑚_𝐻⁺=400 and 750 GeV. Figure taken from [61].

(a)

(b)

(c)