VHH production at the high-luminosity LHC

We study the phenomenology of associated production of a vector boson with a pair of Higgs bosons (VHH at the High-Luminosity LHC (HL-LHC). Despite the low rate of this channel, the scaling of the cross section suggests a measurement could be a useful probe of modifications of the trilinear Higgs boson coupling and anomalous interactions in the gauge-Higgs sector. We focus on both WHH and ZHH production, using the leptonic ( W→lν, Z→ll, Z→νν decay modes of the vector bosons and the HH→4b di-Higgs decay mode. We show that top pair backgrounds are problematic for the W→lν and Z→νν channels, leaving Z→ll as the most promising decay mode. However, even for this channel, we find limited sensitivity due to a low signal rate. We discuss some potential avenues for improvement.