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Evidence for the H → bb decay with the ATLAS detector

, ; Åkesson, Torsten LU ; Bocchetta, Simona LU ; Doglioni, Caterina LU ; Hedberg, Vincent LU ; Jarlskog, Göran LU ; Kalderon, Charles LU ; Kellermann, Edgar LU ; Konya, Balazs LU and Lytken, Else LU , et al. (2017) In Journal of High Energy Physics 2017(12). p.1-69
Abstract

A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb-1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ℓν and Z → ℓℓ. For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This... (More)

A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb-1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ℓν and Z → ℓℓ. For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0.90 ± 0.18(stat.)+0.21 -0.19(syst.). Assuming the Standard Model production cross-section, the results are consistent with the value of the Yukawa coupling to b-quarks in the Standard Model. © The Author(s) 2017. (Less)
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Journal of High Energy Physics
volume
2017
issue
12
pages
1 - 69
publisher
Springer
external identifiers
  • scopus:85039066173
ISSN
1126-6708
DOI
10.1007/JHEP12(2017)024
language
English
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yes
id
f3fdecd1-0497-4369-8828-bfdc53b3a6b6
date added to LUP
2018-09-27 09:11:44
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2019-10-15 06:45:40
@article{f3fdecd1-0497-4369-8828-bfdc53b3a6b6,
  abstract     = {<br/>A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb-1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ℓν and Z → ℓℓ. For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0.90 ± 0.18(stat.)+0.21 -0.19(syst.). Assuming the Standard Model production cross-section, the results are consistent with the value of the Yukawa coupling to b-quarks in the Standard Model. © The Author(s) 2017.},
  author       = {,  and Åkesson, Torsten and Bocchetta, Simona and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Kellermann, Edgar and Konya, Balazs and Lytken, Else and Mankinen, Katja and Mjörnmark, Ulf and Poettgen, R. and Poulsen, Trine and Smirnova, Oxana and Viazlo, Oleksandr},
  issn         = {1126-6708},
  language     = {eng},
  number       = {12},
  pages        = {1--69},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Evidence for the H → bb decay with the ATLAS detector},
  url          = {http://dx.doi.org/10.1007/JHEP12(2017)024},
  volume       = {2017},
  year         = {2017},
}