Abstract
Searches for non-resonant and resonant Higgs boson pair production are performed in the gamma gamma WW^* channel with the final state of gamma gamma ell nu jj using 36.1 hbox {fb}^{-1} of proton–proton collision data recorded at a centre-of-mass energy of sqrt{s}=13 TeV by the ATLAS detector at the Large Hadron Collider. No significant deviation from the Standard Model prediction is observed. A 95% confidence-level observed upper limit of 7.7 pb is set on the cross section for non-resonant production, while the expected limit is 5.4 pb. A search for a narrow-width resonance X decaying to a pair of Standard Model Higgs bosons HH is performed with the same set of data, and the observed upper limits on sigma (pprightarrow X)times B(Xrightarrow HH) range between 40.0 and 6.1 pb for masses of the resonance between 260 and 500 GeV, while the expected limits range between 17.6 and 4.4 pb. When deriving the limits above, the Standard Model branching ratios of the H{rightarrow }{gamma gamma } and H{rightarrow }WW^* are assumed.
Highlights
A particle consistent with the Standard Model (SM) Higgs boson (H ) was discovered by both the ATLAS and CMS experiments at the Large Hadron Collider (LHC) in 2012 [1, 2]
This paper reports searches for non-resonant and resonant production of pairs of Higgs bosons in the semileptonic γ γ W W ∗ final state, i.e. with two photons, two jets, one charged lepton and a neutrino
The simulated background-only samples include the irreducible process of γγνjj and the reducible processes represented by events where one or two hadronic jets are misidentified as photons
Summary
A particle consistent with the Standard Model (SM) Higgs boson (H ) was discovered by both the ATLAS and CMS experiments at the Large Hadron Collider (LHC) in 2012 [1, 2]. It is important to explore the 13 TeV data in the channels that are not covered yet, such as the γ γ W W ∗ channel presented in this paper This decay channel is not the most sensitive amongst all possible Higgs boson decays, it relies on the Higgs boson couplings to vector bosons, which are already relatively well measured. This paper reports searches for non-resonant and resonant production of pairs of Higgs bosons in the semileptonic γ γ W W ∗ final state (γγνjj), i.e. with two photons, two jets, one charged lepton and a neutrino. The MS surrounds the calorimeters and is based on three large air-core toroid superconducting magnets with eight coils each and with bending power in the range 2.0– 7.5 T m It includes a system of fast detectors for triggering purposes and precision tracking chambers. This is followed by a software-based trigger level that reduces the accepted event rate to an average of 1 kHz
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