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Search for the b(b)over-bar decay of the Standard Model Higgs boson in associated (W/Z)H production with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2892
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, 069Article in journal (Refereed) Published
Abstract [en]

A search for the b (b) over bar decay of the Standard Model Higgs boson is performed with the ATLAS experiment using the full dataset recorded at the LHC in Run 1. The integrated luminosities used are 4.7 and 20.3 fb(-1) from pp collisions at root s = 7 and 8 TeV, respectively. The processes considered are associated (WIZ)H production, where W -> e nu/mu nu, Z -> ee/mu mu, and Z -> nu nu. The observed (expected) deviation from the backgroundonly hypothesis corresponds to a significance of 1.4 (2.6) standard deviations and the ratio of the measured signal yield to the Standard Model expectation is found to be mu = 0.52 +/- 0.32 (stat.) +/- 0.24 (syst.) for a Higgs boson mass of 125.36 GeV. The analysis procedure is validated by a measurement of the yield of (W/Z)Z production with Z -> b (b) over bar in the same final states as for the Higgs boson search, from which the ratio of the observed signal yield to the Standard Model expectation is found to be 0.74 +/- 0.09 (stat.) +/- 0.14 (syst.).

Place, publisher, year, edition, pages
2015. no 1, 069
Keyword [en]
Hadron-Hadron Scattering
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-163584DOI: 10.1007/JHEP01(2015)069ISI: 000349610300002Scopus ID: 2-s2.0-84921341275OAI: oai:DiVA.org:kth-163584DiVA: diva2:801358
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20150409

Available from: 2015-04-09 Created: 2015-04-09 Last updated: 2017-12-04Bibliographically approved

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