Charged Higgs Pair Production in a General Two Higgs Doublet Model at e+e− and μ+μ− Linear Colliders

Abstract

In this paper, charged Higgs pair production through ℓ+ℓ− → H+H−, where ℓ = e or μ, is studied within the framework of a general Two Higgs Doublet Model (2HDM). The analysis is relevant to a future e+e− or μ+μ− collider operating at center of mass energy of √s = 500 GeV. Two different scenarios of small and large a values are studied. Here α is the parameter, which diagonalizes the neutral CP-even Higgs boson mass matrix. Within the Minimal Supersymmetric Standard Model (MSSM), cross section of this process is almost the same at e+e− and μ+μ− colliders. It is shown that at e+e− colliders within a general 2HDM, cross section is not sensitive to the mass of neutral Higgs bosons, however, it can acquire large values up to several picobarn at μ+μ− colliders with the presence of heavy neutral Higgs bosons. A scan over Higgs boson mass parameter space is performed to analyze the effect of large masses of neutral Higgs bosons involved in the s-channel propagator and thus in the total cross section of this process.