Revisiting at the LHC and FCC-hh
arXiv:2208.11134 · doi:10.1007/JHEP06(2023)077
Abstract
Diboson production processes provide good targets for precision measurements at present and future hadron colliders. We consider production, focusing on the decay channel, whose sizeable cross section makes it accessible at the LHC. We perform an improved analysis by combining the 0-, 1- and 2-lepton channels with a scale-invariant -tagging algorithm that allows us to exploit events with either a boosted Higgs via mass-drop tagging or resolved -jets. This strategy gives sensitivity to 4 dimension-6 SMEFT operators that modify the and couplings to quarks and is competitive with the bounds obtained from global fits. The benefit of the decay channel is the fact that it is the only channel accessible at the LHC Run 3 and HL-LHC, while at FCC-hh it is competitive with the effectively background-free channel assuming % systematic uncertainty. Combining the boosted and resolved categories yields a 17% improvement on the most strongly bounded Wilson coefficient at the LHC Run 3 with respect to the boosted category alone (and a 7% improvement at FCC-hh). We also show that, at FCC-hh, a binning in the rapidity of the system can significantly reduce correlations between some EFT operators. The bounds we obtain translate to a lower bound on the new physics scale of , , and TeV at the LHC Run 3, HL-LHC, and FCC-hh respectively, assuming new-physics couplings of order unity. Finally, we assess the impact of the production channel on anomalous triple gauge coupling measurements, comparing with their determination at lepton colliders.
arXiv comment21 + 23 pages, 14 figures, 34 tables, 6 appendices. v2: added clarifications, minor corrections, conclusions unchanged, matches published version
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