Anomalous Higgs-boson coupling effects in HWW production at the LHC

Abstract

We study the LHC associated production of a Higgs boson and a W^+W^- vector-boson pair at 14 TeV, in the Standard Model and beyond. We consider different signatures corresponding to the cleanest H and W decay channels, and discuss the potential of the high-luminosity phase of the LHC. In particular, we investigate the sensitivity of the HWW production to possible anomalous Higgs couplings to vector bosons and fermions. Since the b-quark initiated partonic channel contributes significantly to this process, we find a moderate sensitivity to both the size and sign of an anomalous top-quark Yukawa coupling, because perturbative unitarity in the standard model implies a destructive interference in the b b-bar subprocess. We show that a combination of various signatures can reach a ~9 standard-deviation sensitivity in the presently allowed negative region of the top-Higgs coupling, if not previously excluded.

13 pages, 3 figures

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• Gluon fusion and $b\bar{b}$ corrections to $H{W}^{+}{W}^{-}/HZZ$ production in the POWHEG-BOX
• Constraining capability of $Z\gamma h$ production at the ILC
• Precision study of $W^{-}{W}^{+}H$ production including parton shower effects at the CERN Large Hadron Collider