Search for charged Higgs decays of the top quark using hadronic tau decays

TL;DR

This paper reports a search for charged Higgs bosons decaying into hadronic tau leptons from top quark decays in proton-antiproton collisions, setting new limits on their masses within two-Higgs-doublet models.

Contribution

It presents the first experimental search for charged Higgs decays to hadronic tau in top quark events at Fermilab, excluding new mass regions.

Findings

Excluded certain top and charged Higgs mass combinations

Identified unique event signatures with missing energy and tau decays

Provided constraints on two-Higgs-doublet model parameters

Abstract

We present the result of a search for charged Higgs decays of the top quark, produced in $p\bar{p}$ collisions at $\surd s =$ 1.8 TeV. When the charged Higgs is heavy and decays to a tau lepton, which subsequently decays hadronically, the resulting events have a unique signature: large missing transverse energy and the low-charged-multiplicity tau. Data collected in the period 1992-1993 at the Collider Detector at Fermilab, corresponding to 18.7$\pm$0.7~pb$^{-1}$, exclude new regions of combined top quark and charged Higgs mass, in extensions to the standard model with two Higgs doublets.