Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H→aa→4b channel in pp collisions at s√=13 TeV with the ATLAS detector Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration Beyond Standard Model Hadron-Hadron scattering (experiments) Higgs Physics A search for exotic decays of the Higgs boson into a pair of spin-zero particles, H→aa, where the a-boson decays into b-quarks promptly or with a mean proper lifetime cτa up to 6 mm and has a mass in the range of 20−60 GeV, is presented. The search is performed in events where the Higgs boson is produced in association with a W or Z boson, giving rise to a signature of one or two charged leptons (electrons or muons) and multiple jets from b-quark decays. The analysis is based on the dataset of proton-proton collisions at s√=13 TeV recorded in 2015 and 2016 by the ATLAS detector at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 36.1 fb−1. No significant excess of events above the Standard Model background prediction is observed, and 95% confidence-level upper limits are derived for the production cross-sections for pp→WH, ZH and their combination, times the branching ratio of the decay chain H→aa→4b. For a-bosons which decay promptly, the upper limit on the combination of cross-sections for WH and ZH times the branching ratio of H→aa→4b ranges from 3.0 pb for ma=20 GeV to 1.3 pb for ma=60 GeV, assuming that the ratio of WH to ZH cross-sections follows the Standard Model prediction. For a-bosons with longer proper lifetimes, the most stringent limits are 1.8 pb and 0.6 pb, respectively, at cτa∼0.4 mm. 2019-11-05T08:57:21Z 2019-11-05T08:57:21Z 2018-10-04 info:eu-repo/semantics/article Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., ... & Abreu, H. (2018). Search for the Higgs boson produced in association with a vector boson and decaying into two spin-zero particles in the H→ aa→ 4 b channel in pp collisions at $$\sqrt {s}= 13$$ TeV with the ATLAS detector. Journal of High Energy Physics, 2018(10), 31. http://hdl.handle.net/10481/57686 10.1007/JHEP10(2018)031 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Springer Nature