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Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV


CDF Collaboration; et al; Kilminster, Benjamin; Clark, A; Lister, A; Wu, X (2018). Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV. Physical review D, 98(7):072002.

Abstract

The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (p¯p) collisions with a vertex displaced from the p¯p interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4  fb−1, is used to measure the Z-boson production cross section times branching ratio into b¯b. The number of Z→b¯b events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(p¯p→Z)×B(Z→b¯b)=1.11±0.08(stat)±0.14(syst)  nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive p¯p→H→b¯b process at √s=1.96  TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6  pb, at the 95% confidence level.

Abstract

The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (p¯p) collisions with a vertex displaced from the p¯p interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4  fb−1, is used to measure the Z-boson production cross section times branching ratio into b¯b. The number of Z→b¯b events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(p¯p→Z)×B(Z→b¯b)=1.11±0.08(stat)±0.14(syst)  nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive p¯p→H→b¯b process at √s=1.96  TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6  pb, at the 95% confidence level.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Physics and Astronomy (miscellaneous)
Language:English
Date:11 October 2018
Deposited On:20 Dec 2018 09:54
Last Modified:23 Feb 2020 08:23
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevd.98.072002
Project Information:
  • : FunderFP7
  • : Grant ID302103
  • : Project TitleTAUKITFORNEWPHYSICS - Tau Toolkit for opening the New Physics Window at LHC and possible spin off effects

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