Search for charged Higgs bosons in decays of top quarks

Abstract

We present a search for charged Higgs bosons in decays of top quarks, in the mass range $80 < m_{H^{pm} < 155$ GeV, assuming the subsequent decay $H^{_s16} to tau^{_s16} nu_tau$ (and its charge conjugate). Using 0.9 fb$^{-1}$ of lepton_s16jets data collected with the D0 detector at the Fermilab Tevatron $pbar{p}$ collider, operating at a center of mass energy $sqrt{s}=1.96$ TeV, we find no evidence for a $H^{pm}$ signal. Hence, we exclude branching ratios $B(t to H^_s16b) > 0.24$ for $m_{H^{pm}=80$ GeV, and $B(t to H^_s16b) > 0.19$ for $m_{H^{pm}=155$ GeV, at the 95% C.L.