Speaker
Mr
Tong LI
(Shandong University)
Description
This talk will present a search for Higgs boson pair (hh) production in association with a vector boson (W or Z) using 139/fb of the proton-proton collision data at √s = 13TeV recorded with the ATLAS detector. The search is performed in final states in which the vector boson decays leptonically (W → lν, Z → ll, νν with l = e, μ) and the Higgs bosons decay to a pair of b-quarks. It targets Vhh signals from both the Standard Model (SM) like non-resonant hh production and the resonant hh production predicted in some SM extensions. A 95% confidence-level upper limit of 183.5 (86.8) times the SM cross-section is observed (expected) for non-resonant Vhh production when assuming SM-like kinematics. Constraints on Higgs boson coupling modifiers are also set. For the resonant search, upper limits on the production cross-sections are derived for two specific models: one is the production of a vector boson along with a neutral heavy scalar resonance H that decays into hh, and the other is the production of a heavier neutral pseudoscalar resonance A that decays into a Z and H boson. Constraints in the parameter space of two-Higgs-doublet models are also derived.
Primary authors
Lianliang MA
(Shandong University)
Mr
Tong LI
(Shandong University)
Zhongyukun Xu
(Shandong University)
