Higgs boson production from a singlet charged lepton in electron-positron collisions

Abstract

A vector-like charged singlet lepton in the mass range m_H+m_τ<m_L<m_W is a good source of the standard model Higgs boson, via its decay mode L→τH. In the e⁺e⁻ collisions at LEP II, Higgs boson production from this source is about an order of magnitude larger than that from the standard Bjorken process. This is also a very clean signal for the singlet lepton, as the associated backgrounds are several orders of magnitude smaller. We also discuss how the singlet signals can be distinguished from those of a sequential doublet lepton.