Search for Charged Higgs Bosons in Decays of Top Quarks in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>

We report on the first direct search for charged Higgs bosons decaying into $c\overline{s}$ in $t\overline{t}$ events produced by $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$. The search uses a data sample corresponding to an integrated luminosity of $2.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the CDF II detector at Fermilab and looks for a resonance in the invariant mass distribution of two jets in the $\mathrm{\text{lepton}}+\mathrm{\text{jets}}$ sample of $t\overline{t}$ candidates. We observe no evidence of charged Higgs bosons in top quark decays. Hence, 95% upper limits on the top quark decay branching ratio are placed at $\mathcal{B}(t\ensuremath{\rightarrow}{H}^{+}b)<$ 0.1 to 0.3 for charged Higgs boson masses of 60 to $150\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ assuming $\mathcal{B}({H}^{+}\ensuremath{\rightarrow}c\overline{s})=1.0$. The upper limits on $\mathcal{B}(t\ensuremath{\rightarrow}{H}^{+}b)$ are also used as model-independent limits on the decay branching ratio of top quarks to generic scalar charged bosons beyond the standard model.

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