Detection of heavy charged Higgs bosons in e+ e- -> t anti-b H- production at future linear colliders.
European Physical Journal C, 34, . (doi:10.1140/epjc/s2004-01668-9).
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Heavy charged Higgs bosons (H±) 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? ? t¯bH?+ c.c. ? 4b+jj++pmiss
T (where j represents a jet and with
= e, ?) contributes to extend the discovery reach of H± states into the mass region MH± ?s/2, where
the well studied pair production channel e+e? ? H?H+ is no longer available. With a technique that
allows one to reconstruct the neutrino four-momentum in the decay t ? bW+ ? b+?, one can suppress
the initially overwhelming main irreducible background due to e+e? ? t¯tb¯b (via a gluon splitting into b¯b
pairs) to a negligible level. However, for currently foreseen luminosities, one can establish a statistically
significant H± signal only over a rather limited mass region, of 20 GeV or so, beyond MH± ? ?s/2, for
very large or very small values of tan ? and provided high b-tagging efficiency can be achieved.
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