Speaker
Prof.
Flera Ritzadinova
(Oklahoma State University)
Description
We report on a search for charged Higgs bosons in the mass range
80 < m_H+ < 155 GeV in decays of top quark pairs in ppbar collisions
at sqrt{s}=1.96 TeV. It has been performed using ~1 fb-1 of data
collected with the D0 detector at the Fermilab Tevatron collider. The
search is based on the analysis of ttbar production rates in the final
states with two isolated leptons (electrons or muons) and jets, one
isolated lepton (electron or muon) and jets and isolated lepton
(electron or muon) and tau decaying hadronically. We find no evidence
for signal. The results are interpreted within a tauonic Higgs model
where the charged Higgs is assumed to decay exclusively to taunu and
in a leptophobic model where the charged Higgs is assumed to decay
exclusively to csbar. We set upper limits on the branching fractions
B(t -> H+ b -> taubar neutrino b)) and B(t -> H+ b -> c sbar b)) for
low charged-Higgs masses.
We also use ratios of ttbar cross sections in different final states
to set upper limits on those branching fractions.
Furthermore, we describe a search for quark fusion production qq' -->
H+ of the charged Higgs boson reconstructed in the tb final state for
a mass range 180 < m_H+ < 300 GeV. We find no evidence for heavy
charged Higgs production and set limits on the production
cross-section for a variety of theoretical models.
Authors
Aurelio Juste
(Fermilab)
Dr
Eric James
(Fermi National Accelerator Lab)
H Wahl
(Florida State University)
Stefan Soldner-Rembold
(University of Manchester)
TBA
