Speakers
Description
"This letter presents a combination of searches for Higgs boson pair (HH) production
performed by the ATLAS and CMS Collaborations using proton–proton collision data
sets recorded at √s = 13 TeV at the LHC Run 2, corresponding to integrated luminosi-
ties ranging between 126 and 140 fb−1. The upper limit at the 95% confidence level
on the total HH production cross section corresponds to 2.5 times the standard model
(SM) prediction with an expected value of 1.7 (2.8) assuming the absence (presence)
of the SM HH signal. The strength of the HH signal is measured to be 0.8+0.9
−0.7 relative
to the SM prediction. The observed significance is found to be 1.1 standard deviations
when 1.3 are expected for the SM HH signal. Constraints are set on the Higgs boson
trilinear self-coupling and on the couplings of two Higgs bosons to two vector bosons,
both normalized to the SM predictions and denoted as κλ and κ2V, respectively. The
observed individual constraints at the 95% confidence level are−0.71 < κλ < 6.1 and
0.73 < κ2V < 1.3, while the expected constraints assuming the presence of the SM
HH signal are−1.3 < κλ < 6.7 and 0.66 < κ2V < 1.4."
