Search for Higgs Bosons in $WW^*\rightarrow\ell^+\ell'^-$ Decays

The process $H\rightarrow WW^*\rightarrow\ell^+\ell'^-$ ($\ell$, $\ell'$ = $e$,$\mu$) is studied in $p\bar{p}$ collisions at the center of mass energy $\sqrt{s} = 1.96$ TeV with the upgraded D0 detector at the Fermilab Tevatron accelerator. A Higgs particle with a mass greater than 140 GeV primarily decays into a of W-bosons and the semi-leptonic decay channels of the W provide a clear signature. Besides the search for the Standard Model Higgs, exotic models with enhanced Higgs production cross sections are already probed with data corresponding to integrated luminosity of 0.9 fb$^{^-1}$.