CERN Accelerating science

CMS Note
Report number	CMS-NOTE-2006-119
Title	Search for $H \to b\overline{b}$ in Association with a ttbar Pair at CMS
Author(s)	Benedetti, Daniele ; Cucciarelli, Susanna ; Hill, Christopher ; Incandela, Joe ; Koay, Sue Ann ; Riccardi, Cristina ; Santocchia, Attilio ; Schmidt, Alexander ; Torre, Paola ; Weiser, Christian
Submitted by	12 Jun 2006
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Free keywords	PHYSICS
Abstract	The discovery of a low mass Higgs boson is particularly challenging because the leading decay mode is H -> b bbar for a Higgs mass mH < 135 GeV/c2. Direct Higgs production is thus overwhelmed by the more mundane QCD production of b bbar pairs. This leads one to more rare, but also more accessible modes such as H -> gamma gamma. Nevertheless, the degree to which the Higgs is manifested in a variety of channels and modes could hold important clues to its true identity, and whether it heralds from a more rich Higgs sector than that of the Standard Model. A potentially promising channel is the production of Higgs in association with a t tbar pair. The search for H -> b bbar is enhanced by properties of top quark decays that allow a dramatic reduction in possible backgrounds. These events contain four energetic b jets and fall into three salient subclasses depending upon whether neither, one, or both of the W bosons in the event decay to electrons or muons and their respective neutrinos. In this note we present results of studies of all three subclasses of t tbar H events in CMS with an integrated luminosity of 60 fb^-1. The search for a low mass Higgs in t tbar H relies upon every ubsystem in the CMS experiment and relies particularly strongly upon the CMS Tracking System. It is very challenging.
Copyright/License	Preprint: (License: CC-BY-4.0)

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