Heavy charged Higgs boson production at next generation $e^{\pm }{\hat{I}}^3$ colliders

Abstract

We assess the potential of future electron-positron linear colliders operating in the $e^{\pm }{\hat{I}}^3$ mode in detecting charged Higgs bosons with mass around and larger than the top quark mass, using Compton back-scattered photons from laser light. We compare the pair production mode, $e^{-}{\hat{I}}^3\to e^{-}{H}^{+}{H}^{-}$, to a variety of channels involving only one charged Higgs scalar in the final state, such as the tree-level processes $e^{-}{\hat{I}}^3\to \hat{I}{½}_e{H}^{-}\hat{I}{¦}^0$ ($\hat{I}{¦}^0=h^0,H^0$ and $A^0$) and $e^{-}{\hat{I}}^3\to \hat{I}{½}_{e}f\bar{f}{H}^{-}$ ($f=b,\ddot{I}„$ and $\hat{I}{½}_{\ddot{I}}„$) as well as the loop-induced channel $e^{-}{\hat{I}}^3\to \hat{I}{½}_e{H}^{-}$. We show that, when the charged Higgs boson mass is smaller than or comparable to half the collider energy, $\sqrt s_{ee}\gsim 2M_{H^\pm}$, single production cross sections are of the same size as the pair production rate, whereas, for charged Higgs boson masses larger than ${\sqrt{s}}_{ee}/2$, all processes are heavily suppressed. In general, production cross sections of charged Higgs bosons via $e^{\pm }{\hat{I}}^3$ scatterings are smaller than those induced at an $e^{+}{e}^{-}$ collider and the latter represents a better option to produce and analyse such particles.

18 pages, latex, 9 figures