CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2012-161
Title	Search for the Standard Model Higgs boson in produced in association with a vector boson and decaying to bottom quarks with the ATLAS detector
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2012
Imprint	14 Nov 2012
Number of pages	mult.
Note	All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-161
In:	Hadron Collider Physics Symposium 2012, Kyoto, Japan, 12 - 16 Nov 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	This note presents an updated search with the ATLAS experiment for the Standard Model Higgs boson produced in association with a $W$ or $Z$ boson and decaying to $b\bar{b}$ using 4.7 \ifb\ of LHC proton-proton data at \SevenTeV\ and 13.0 \ifb\ at \EightTeV. The search is performed using events containing zero, one or two electrons or muons targeting the three decay modes \vvbb, \lvbb and $ZH \to \ell^+\ell^- b\bar{b}$. No significant excess is observed. For $m_H = 125$ GeV, the observed (expected) upper 95\% confidence level limit on the cross section times the branching ratio is found to be 1.8 (1.9) times the Standard Model prediction. A Standard Model Higgs boson with $m_H = 110$ GeV is excluded. As a validation of the analysis procedure, the production of diboson pairs, $WZ$ and $ZZ$, with a $Z$ boson decaying to $b\bar{b}$, has been observed with a significance of 4.0 standard deviations and a rate compatible with the Standard Model expectation.
Copyright/License	Preprint: (License: CC-BY-4.0)

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