TY - JOUR
T1 - Search for the Standard Model Higgs boson decaying into bb¯¯bb¯ produced in association with top quarks decaying hadronically in pp collisions at s√=8s=8 TeV with the ATLAS detector
AU - ATLAS Collaboration
AU - Newman, Paul
AU - Allport, Philip
AU - Aperio Bella, Ludovica
AU - Baca, Matthew
AU - Bracinik, Juraj
AU - Broughton, James
AU - Casadei, Diego
AU - Charlton, David
AU - Chisholm, Andrew
AU - Daniells, Andrew
AU - Foster, Andrew
AU - Gonella, Laura
AU - Hawkes, Christopher
AU - Head, Simon
AU - Hillier, Stephen
AU - Levy, Mark
AU - Mudd, Richard
AU - Murillo Quijada, Javier
AU - Nikolopoulos, Konstantinos
AU - Owen, Rhys
AU - Slater, Mark
AU - Thomas, Jurgen
AU - Thompson, Paul
AU - Watson, Miriam
AU - Wilson, John
AU - Watson, Alan
AU - Watkins, Peter
N1 - 30 pages plus author list + cover pages (53 pages total), 14 figures, 9 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2015-05/
PY - 2016/5/27
Y1 - 2016/5/27
N2 - A search for Higgs boson production in association with a pair of top quarks ($t\bar{t}H$) is performed, where the Higgs boson decays to $b\bar{b}$, and both top quarks decay hadronically. The data used correspond to an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=8$ TeV collected with the ATLAS detector at the Large Hadron Collider. The search selects events with at least six energetic jets and uses a boosted decision tree algorithm to discriminate between signal and Standard Model background. The dominant multijet background is estimated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, an upper limit of 6.4 (5.4) times the Standard Model cross section is observed (expected) at 95% confidence level. The best-fit value for the signal strength is $\mu = 1.6 \pm 2.6$ times the Standard Model expectation for $m_{H} = 125$ GeV. Combining all $t\bar{t}H$ searches carried out by ATLAS at $\sqrt{s}=8$ and 7 TeV, an observed (expected) upper limit of 3.1 (1.4) times the Standard Model expectation is obtained at 95% confidence level, with a signal strength $\mu = 1.7 \pm 0.8$.
AB - A search for Higgs boson production in association with a pair of top quarks ($t\bar{t}H$) is performed, where the Higgs boson decays to $b\bar{b}$, and both top quarks decay hadronically. The data used correspond to an integrated luminosity of 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=8$ TeV collected with the ATLAS detector at the Large Hadron Collider. The search selects events with at least six energetic jets and uses a boosted decision tree algorithm to discriminate between signal and Standard Model background. The dominant multijet background is estimated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, an upper limit of 6.4 (5.4) times the Standard Model cross section is observed (expected) at 95% confidence level. The best-fit value for the signal strength is $\mu = 1.6 \pm 2.6$ times the Standard Model expectation for $m_{H} = 125$ GeV. Combining all $t\bar{t}H$ searches carried out by ATLAS at $\sqrt{s}=8$ and 7 TeV, an observed (expected) upper limit of 3.1 (1.4) times the Standard Model expectation is obtained at 95% confidence level, with a signal strength $\mu = 1.7 \pm 0.8$.
KW - hep-ex
KW - Hadron-Hadron scattering (experiments)
U2 - 10.1007/JHEP05(2016)160
DO - 10.1007/JHEP05(2016)160
M3 - Article
SN - 1126-6708
JO - JHEP
JF - JHEP
ER -