We search for the neutral higgs production associated with the $W$ boson using high-$p_{ T}$ isolated like-sign dilepton events in $p\bar{ p}$ collisions at $\sqrt{ s}$ = 1.96 TeV. The data were collected with the CDF-II detector at the Fermilab Tevatron collider and correspond to an integrated luminosity of 1.9 ${ \rm fb}^{ -1}$. We examine the dilepton events on the plane of the 2nd lepton $p_{ T}$ ($p_{ T2}$) versus the $ p_{ T}$ of dilepton system ($p_{ T12}$) and tune the final cut to maximize the sensitivity on the plane. We set the final cut to the 2nd lepton $p_{ T}$ greater than 20 GeV/c and the $p_{ T}$ of dilepton system greater than 15 GeV/c. The expected number of signal events is 0.46 for the fermiophobic higgs of the mass 110 GeV/$c^{ 2}$ and 0.19 for the mass 160 GeV/$c^{ 2}$ assuming the Standard Model cross section. The number of events for the Standard Model higgs is 0.02 and 0.18 for 110 GeV/$c^2$ and 160 GeV/$c^{ 2}$, respectively. The expected number of backgrounds is 3.23 $\pm$ 0.69, while we observed 3 events in the data. From these results, we obtain the limits on $\sigma(p\bar{ p}\to Wh) \times Br(h\to W^{ +}W^{ -})$ of 2.2 pb for the higgs of 110 GeV/$c^{ 2}$ and 1.4 pb for 160 GeV/$c^2$ at the 95% confidence level.
Categories: hep-ex