Searches for HH production in the bbVV final state with the CMS detector (Sebastien Wertz)

by Mr Sébastien Wertz (UCL-CP3)

Wednesday 31 May 2017, 13:00 → 14:00 Europe/Brussels

E/3rd floor-E.349 - Seminar room (E.349) (Marc de Hemptinne (chemin du Cyclotron, 2, Louvain-la-Neuve))

Searches for resonant and nonresonant pair-produced Higgs bosons decaying respectively into bb and llvv (through either W or Z bosons), are presented. The analyses are based on a sample of proton-proton collisions at sqrt(s) = 13 TeV at the LHC collected by the CMS experiment corresponding to an integrated luminosity of 35.9/fb. The sensitivity of the analysis is optimised using a parameterised deep neural network designed to produce optimal signal-to-background discrimination on the whole considered parameter space. Data and predictions from the standard model are in agreement within uncertainties. For the standard model hypothesis, the data exclude a production cross section times branching fraction of 72 fb, corresponding to 79 times the SM cross section, consistent with expectations. In the absence of deviations from the SM predictions in the observations, constraints are placed on different scenarios considering anomalous couplings which could affect the rate and kinematics of hh production. In case of a resonant production of a new particle decaying into hh, the data are observed to exclude a production cross section times branching fraction of narrow-width spin-0 particles from 434 to 17 fb and narrow-width spin-2 particles from 448 to 14 fb, consistent with expectations.