The data are also analyzed to probe resonant Higgs boson pair production, constraining a model with an extended Higgs sector based on two doublets and a Randall-Sundrum bulk graviton model.
The cross-section times branching ratio for nonresonant Higgs boson pair production is constrained to be less than 30.9 fb, 12.7 times the more » standard model expectation, at 95% confidence level. No significant excess above the expected background is observed in the data. Decays of the τ-lepton pairs with at least one τ lepton decaying to final states with hadrons and a neutrino are considered. The search uses 36.1 fb –1 of pp collision data with √s = 13 TeV recorded by the ATLAS experiment at the LHC in 20. « lessĪ search for resonant and nonresonant pair production of Higgs bosons in the b¯bτ +τ – final state is presented. These results are interpreted in the context of two simplified scenarios of the Minimal Supersymmetric Standard Model. The observed (expected) limits range from 2.1 (1.1) pb at 260 GeV to 0.011 (0.018) pb at 1000 GeV. more » For production via narrow resonances, cross-section limits of hh production from a heavy Higgs boson decay are set as a function of the heavy Higgs boson mass. An upper limit of 0.69 (0.47) pb on the nonresonant hh production is observed (expected), corresponding to 70 (48) times the SM gg→hh cross section. These results are then combined with the published results of the hh→γγbb, bbbb analyses.
No evidence of their production is observed and 95% confidence-level upper limits on the production cross sections are set. Searches for both resonant and nonresonant Higgs boson pair production are performed in the hh→bbττ, γγWW* final states using 20.3 fb-1 of pp collision data at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. C, Particles and Fields Additional Journal Information: Journal Volume: 75 Journal Issue: 9 Journal ID: ISSN 1434-6044 Publisher: Springer Country of Publication: United States Language: English Subject: 72 PHYSICS OF ELEMENTARY PARTICLES AND = , (BNL), Upton, NY (United States) Lawrence Berkeley National Lab. (ANL), Argonne, IL (United States) Brookhaven National Lab. Publication Date: Wed Sep 09 00:00: Research Org.: SLAC National Accelerator Lab., Menlo Park, CA (United States) Argonne National Lab.
The search for non-resonant Standard Model hh production sets an observed 95 % confidence level upper limit on the production cross-section σ(pp → hh → bbbb) of 202 fb, compared to a Standard Model prediction of σ(pp → hh → bbbb) = 3.6 ± 0.5fb. An upper limit on the cross-section for pp → G* KK → hh → bbbb of 3.2 (2.3) fb is set for aKaluza-Klein graviton G* KK mass of 1.0 (1.5)TeV, at the 95 % confidence level. The data are interpreted in the context of the Randall-Sundrum model with a warped extra dimension as well as the two-Higgs-doublet model. No evidence for resonant or non-resonant Higgs boson pair production is observed.
The decay products of each Higgs boson are reconstructed as a highmomentum bb system with either a pair of small-radius jets or a single large-radius jet, the latter exploiting jet substructure techniques and associated b-tagged track-jets. A search for Higgs boson pair production pp → hh is performed with 19.5 fb -1 of proton-proton collision data at √s = 8TeV, which were recorded by the ATLAS detector at the Large Hadron Collider in 2012. © CERN for the benefit of the ATLAS collaboration 2015.
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