The European Physical Journal C - Particles and Fields

, Volume 34, Issue 2, pp 157–163

Detection of heavy charged Higgs bosonsin \(e^ + e^-\to t\bar b H^-\) production at future Linear Colliders

theoretical physics

DOI: 10.1140/epjc/s2004-01668-9

Cite this article as:
Moretti, S. Eur. Phys. J. C (2004) 34: 157. doi:10.1140/epjc/s2004-01668-9


Heavy charged Higgs bosons (\(H^\pm\)) of a Type II 2-Higgs doublet model (2HDM) can be detected at future electron-positron Linear Colliders (LCs) even when their mass is larger than half the collider energy. The single Higgs mode \(e^ + e^-\to t\bar b H^- + {\mathrm {c.c.}} \to 4b + {\mathrm {j}}{\mathrm {j}} + \ell + p_{\mathrm {T}}^{\mathrm {miss}}\) (where j represents a jet and with \(\ell = e,\mu\)) contributes to extend the discovery reach of \(H^\pm\) states into the mass region \(M_{H^\pm}\gtrsim \sqrt s/2\), where the well studied pair production channel \(e^ + e^-\to H^-H^ + \) is no longer available. With a technique that allows one to reconstruct the neutrino four-momentum in the decay \(t\to b W^ + \to b \ell^ + \nu\), one can suppress the initially overwhelming main irreducible background due to \(e^ + e^-\to t\bar t b\bar b\) (via a gluon splitting into \(b\bar b\) pairs) to a negligible level. However, for currently foreseen luminosities, one can establish a statistically significant \(H^\pm\) signal only over a rather limited mass region, of 20 GeV or so, beyond \(M_{H^\pm}\approx \sqrt s/2\), for very large or very small values of \(\tan\beta\) and provided high b-tagging efficiency can be achieved.

Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.School of Physics & AstronomyUniversity of SouthamptonHighfield, SouthamptonUK