CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2013-027
Title	Search for Higgs bosons in Two-Higgs-Doublet models in the $H \rightarrow WW\rightarrow e \nu\mu\nu$ channel with the ATLAS detector
Corporate Author(s)	The ATLAS collaboration
Publication	2013
Collaboration	ATLAS Collaboration
Imprint	11 Mar 2013
Number of pages	23
Note	All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2013-027
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The Higgs-like boson observed at the LHC with a mass of approximately 125 GeV could be part of an extended scalar sector originating from two complex Higgs doublets. The analysis presented in this note investigates the possibility of a Two-Higgs-Doublet model (2HDM) being realized in nature by searching for evidence of a second, heavier, CP-even scalar boson in the $H\rightarrow WW^{(*)}\rightarrow e^{-} \bar{\nu} \, \mu^{+} \nu \, / \, e^{+} \nu \, \mu^{-} \bar{\nu}$ decay mode. The analysis is based on proton-proton collision data at a centre-of-mass energy of 8 TeV collected with the ATLAS detector and corresponding to an integrated luminosity of 13.0$\,\mathrm{fb^{-1}}$. Artificial neural network techniques are used to maximise the sensitivity. No evidence for a second scalar boson is found in the investigated mass range between 135 and 300 GeV. Exclusion limits on type-I and type-II 2HDMs are set as a function of the two mixing angles $\alpha$ and $\beta$ as well as the mass $m_H$ of the heavier scalar boson. For the limits the signal hypothesis includes the Higgs-like boson at 125 GeV and assumes that it is the light scalar h of a 2HDM, while the null hypothesis assumes no Higgs boson at all.
Copyright/License	Preprint: (License: CC-BY-4.0)

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