All-hadronic HHZ production at 3 TeV CLIC

In this note, ZHH production in the all-hadronic final state is studied in e+ e- collisions at the Compact Linear Collider at the 3 TeV stage. At this stage this Higgs boson pair production mode is sub-leading to the W W fusion production cross-section of e+ e- → HHνν. The events are characterised by a topology of six jets, where the masses of the three pair-wise combinations of two jets are compatible with originating from two H and one Z bosons. The event selection concentrates on the dominant H boson decays into two b-quarks by requiring a presence of multiple b-jets. The study is based on full simulation using the CLICdet model, including beam-induced backgrounds from γ γ → hadrons. Results on the measurement of the total ZHH cross section are given.