Regular Article – Experimental Physics
Double Higgs boson production and Higgs self-coupling extraction at CLIC
CERN, Geneva, Switzerland
2 University of Cambridge, Cambridge, UK
Accepted: 18 October 2020
Published online: 2 November 2020
The Compact Linear Collider (CLIC) is a future electron–positron collider that will allow measurements of the trilinear Higgs self-coupling in double Higgs boson events produced at its high-energy stages with collision energies from = 1.4 to 3 TeV. The sensitivity to the Higgs self-coupling is driven by the measurements of the cross section and the invariant mass distribution of the Higgs-boson pair in the W-boson fusion process, . It is enhanced by including the cross-section measurement of ZHH production at 1.4 TeV. The expected sensitivity of CLIC for Higgs pair production through W-boson fusion is studied for the decay channels and using full detector simulation including all relevant backgrounds at = 1.4 TeV with an integrated luminosity of = 2.5 ab and at = 3 TeV with = 5 ab. Combining and ZHH cross-section measurements at 1.4 TeV with differential measurements in events at 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of and at 68% C.L., assuming the Standard Model. In addition, prospects for simultaneous constraints on the trilinear Higgs self-coupling and the Higgs-gauge coupling HHWW are derived based on the measurement.
© The Author(s) 2020
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