Heavy charged Higgs boson production at next generation $e^\pm\gamma$ colliders

S. Kanemura; S. Moretti; K. Odagiri

doi:doi:10.1007/s100520100828

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Particles and Fields

Eur. Phys. J. C 22, 401-410 (2001)
DOI: 10.1007/s100520100828

Heavy charged Higgs boson production at next generation $e^\pm\gamma$ colliders

S. Kanemura¹, S. Moretti² and K. Odagiri³

¹ Physics and Astronomy Department, Michigan State University, East Lansing, MI 48824-1116, USA
² Theory Division, CERN, 1211 Genève 23, Switzerland
³ Theory Group, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

(Received: 29 August 2001 / Published online: 23 November 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
We assess the potential of future electron-positron linear colliders operating in the $e^\pm\gamma$ 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, $e^-\gamma\to e^- H^+H^-$ , to a variety of channels involving only one charged Higgs scalar in the final state, such as the tree-level processes $e^-\gamma\to \nu_e H^- \Phi^0$ ( $\Phi^0=h^0,H^0$ and A⁰) and $e^-\gamma\to \nu_e f\bar f H^-$ ( $f=b,\tau$ and $\nu_\tau$ ) as well as the loop-induced channel $e^-\gamma\to \nu_e H^-$ . We show that, when the charged Higgs boson mass is smaller than or comparable to half the collider energy, $\sqrt s_{ee}\gtrsim 2M_{H^\pm}$ , 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 $e^\pm\gamma$ scatterings are smaller than those induced at an e⁺e^- collider and the latter represents a better option to produce and analyse such particles.