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Abstract
One of the most promising channels to discover a “light” Higgs boson (mass of 120 − 130 GeV / c 2 ) with the CMS detector at LHC is the t t ¯ H channel. In this study we investigate the possibility of selecting this channel from the QCD multijets background. We present a High Level Trigger selection for the t t ¯ H decaying in fully hadronic final states. The basic idea is to use a fast b-tagging algorithm after the Level-1 trigger selection based on the number of jets and energy cuts. The main background source considered is direct QCD multijet production with pile up at low luminosity ( 2 × 10 33 cm −2 s −1 ) scenario.
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