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The measurement of the $B\to X_s\gamma$ process gives important constraintson physics related to charged Higgs bosons ($H^\pm$). In 2-Higgs Doublet Models(2HDMs) with a softly-broken $Z_2$ symmetry, a light $H^\pm$ scenario, in which$H^\pm$ can be produced via the top decay, is possible in two of four types ofYukawa interactions (the so-called Type-I and Type-X). In these types of 2HDMs,the $H^\pm \to \tau^\pm \nu$ decay mode is dominant in wide regions of theparameter space. In this report, we discuss the other possibility of a lightcharged Higgs boson scenario in 3-Higgs-Doublet Models (3HDMs) based on theresults obtained in Ref. [1]. We show that charged Higgs bosons can mainlydecay into $cb$ without contradiction with the $B\to X_s\gamma$ data and thedirect searches for charged Higgs bosons at the LHC, and this scenario cannotbe realized in the 2HDMs.

Light charged Higgs boson scenario in 3HDMs