Abstract
Abstract:
A search is performed for resonant and non-resonant Higgs boson pair production in the γγbb¯ final
state. The data set used corresponds to an integrated luminosity of 36.1 fb−1 of proton–proton
collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large
Hadron Collider. No significant excess relative to the Standard Model expectation is observed. The
observed limit on the non-resonant Higgs boson pair cross-section is 0.73 pb at 95% confidence
level. This observed limit is equivalent to 22 times the predicted Standard Model cross-section.
The Higgs boson self-coupling (κλ =
λH H H /λSM
) is constrained at 95% confidence level to −8.2 < κλ < 13.2. For resonant
Higgs boson pair production through X → HH → γγbb¯, the limit is presented, using the narrow-width
approximation, as a function of mX in the range 260 GeV < mX < 1000 GeV. The observed limits range
from 1.1 pb to 0.12 pb over this mass range.