Abstract
We present a particle-level study of the Standard Model non-resonant Higgs-pair production process in the $b\bar{b}b\bar{b}$ final state, at the Large Hadron Collider at $\sqrt{s}=14$ TeV. Each Higgs boson is reconstructed from a pair of close-by jets formed with the anti-$k_t$ jet clustering algorithm, with radius parameter $R=0.4$. Given the kinematic properties of the produced Higgs bosons, this Higgs reconstruction approach appears to be more suitable than the use of large-radius jets that was previously proposed in the literature. We find that the sensitivity for observing this final state can be improved significantly when the full set of uncorrelated angular and kinematic variables of the $4b$ system is exploited, leading to a statistical significance of 1.8 per experiment with an integrated luminosity of 3 ab$^{-1}$.
Highlights
We extend our previous work on resonant Higgs-pair production in the bbbb final state [12]— which inspired the recent ATLAS analysis [13]—to the nonresonant case, considering all the relevant background processes, namely bbbb, bbcc, and tt
We note that triggering will be a major challenge at the HL-Large Hadron Collider (LHC), but the substantial detector and trigger upgrade programmes proposed by the two experiments should make it possible to maintain the high trigger efficiencies reported by ATLAS in the 8 TeV run [13] in channels that are essential for key measurements at the high luminosity LHC (HL-LHC), such as the Higgs trilinear selfcoupling
These event samples are scaled to their next-toleading order (NLO) cross section by applying a k-factor of 1.5 [25]
Summary
We extend our previous work on resonant Higgs-pair production in the bbbb final state [12]— which inspired the recent ATLAS analysis [13]—to the nonresonant case, considering all the relevant background processes, namely bbbb, bbcc, and tt. Requiring four b-tagged jets, paired into two high- pT dijet systems, is a very powerful way to reduce the backgrounds. This is true for the dominant multi-jet background, which has a cross section that falls rapidly with increasing jet and dijet pT. Due to the high boost, the four jets will have high enough transverse momenta for such events to be selected with high efficiency at the first level triggers of ATLAS and CMS, with efficient high level triggering possible through online b-tagging [13]. We note that triggering will be a major challenge at the HL-LHC, but the substantial detector and trigger upgrade programmes proposed by the two experiments should make it possible to maintain the high trigger efficiencies reported by ATLAS in the 8 TeV run [13] in channels that are essential for key measurements at the HL-LHC, such as the Higgs trilinear selfcoupling
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