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Search for Higgs boson pair production in the two bottom quarks plus two photons final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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Search for Higgs boson pair production in the two bottom quarks plus two photons final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Georges Aad, Braden Keim Abbott, Dale Abbott, Adam Abed Abud, Kira Abeling, Deshan Kavishka Abhayasinghe, Haider Abidi, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2022
DOI: https://doi.org/10.3204/pubdb-2022-06407

摘要

background bottom: 2 bottom: pair production CERN Lab CERN LHC Coll channel cross section: upper limit coupling constant: upper limit experimental results final state: two-photon GeV-cms Higgs particle: coupling Higgs particle: decay modes Higgs particle: hadronic decay Higgs particle: pair production Higgs particle: radiative decay p p: colliding beams p p: scattering resonance: production scalar particle
Searches are performed for nonresonant and resonant di-Higgs boson production in the $b\bar{b}γγ$ final state. The dataset used corresponds to an integrated luminosity of 139 fb$^{-1}$ of proton–proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No excess above the expected background is found and upper limits on the di-Higgs boson production cross sections are set. A 95% confidence-level upper limit of 4.2 times the cross section predicted by the Standard Model is set on $pp→HH$ nonresonant production, where the expected limit is 5.7 times the Standard Model predicted value. The expected constraints are obtained for a background hypothesis excluding $pp→HH$ production. The observed (expected) constraints on the Higgs boson trilinear coupling modifier $κλ$ are determined to be [-1.5,6.7] ([-2.4,7.7]) at 95% confidence level, where the expected constraints on $κλ$ are obtained excluding $pp→HH$ production from the background hypothesis. For resonant production of a new hypothetical scalar particle $X (X → HH → b\bar{b}γγ)$, limits on the cross section for $pp→X→HH$ are presented in the narrow-width approximation as a function of mX in the range 251 GeV$≤mX≤$1000 GeV. The observed (expected) limits on the cross section for $pp→X→HH$ range from 640 fb to 44 fb (391 fb to 46 fb) over the considered mass range.

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