T. Affolder et al., Search for the charged Higgs boson in the decays of top quark pairs in thee tau and mu tau channels at root s=1.8 TeV - art. no. 012004, PHYS REV D, 6201(1), 2000, pp. 2004
Top quark production offers the unique opportunity to search for a charged
Higgs;boson (H+/-), as the contribution from t-->H+ b-->tau(+) nu b can be
large in extensions of the standard model. We use results from a search for
top quark pair production by the Collider Detector at Fermilab (CDF) in th
e e tau + E-T + jets and mu tau + E-T + jets signatures to set an upper lim
it on the branching ratio of B(t-->H+ b) in 106 pb(-1) of data. The upper l
imit is in the range 0.5 to 0.6 at 95% C.L. for H+ masses in the range 60 t
o 160 GeV, assuming the branching ratio for H+-->tau nu is 100%. The tau le
pton is detected through its 1-prong and 3-prong hadronic decays.