Detection of heavy charged Higgs bosons in e+ e- -> t anti-b H- production at future linear colliders


Moretti, S. (2004) Detection of heavy charged Higgs bosons in e+ e- -> t anti-b H- production at future linear colliders. European Physical Journal C, 34, 157-163. (doi:10.1140/epjc/s2004-01668-9).

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Description/Abstract

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, μ) 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+ν, 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 β and provided high b-tagging efficiency can be achieved.

Item Type: Article
ISSNs: 1434-6044 (print)
Related URLs:
Subjects: Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy
ePrint ID: 57478
Date Deposited: 15 Aug 2008
Last Modified: 27 Mar 2014 18:40
URI: http://eprints.soton.ac.uk/id/eprint/57478

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