https://doi.org/10.1140/epjc/s10052-020-08567-7
Regular Article – Experimental Physics
Double Higgs boson production and Higgs self-coupling extraction at CLIC
1
CERN, Geneva, Switzerland
2
University of Cambridge, Cambridge, UK
Received:
17
December
2019
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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