Abstract
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 sqrt{s} = 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, text {e}^{+}text {e}^{-}rightarrow {text {H}text {H}nu bar{nu }}. 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 mathrm{b}bar{mathrm{b}}mathrm{b}bar{mathrm{b}} and mathrm{b}bar{mathrm{b}}mathrm{W}mathrm{W}^{*} using full detector simulation including all relevant backgrounds at sqrt{s} = 1.4 TeV with an integrated luminosity of mathcal {L} = 2.5 ab^{-1} and at sqrt{s} = 3 TeV with mathcal {L} = 5 ab^{-1}. Combining text {e}^{+}text {e}^{-}rightarrow {text {H}text {H}nu bar{nu }} and ZHH cross-section measurements at 1.4 TeV with differential measurements in text {e}^{+}text {e}^{-}rightarrow {text {H}text {H}nu bar{nu }} events at 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of -8% and +11% 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 {text {H}text {H}nu bar{nu }} measurement.
Highlights
Compact Linear Collider (CLIC) for Higgs pair production through W-boson fusion is studied for the decay channels bbbband bbWW∗ using f√ull detector simulation including all relevant backgrounds at s
A deviation of the Higgs potential from the Standard Model (SM) would directly point to new physics, for example in the context of baryogenesis: one of the conditions for electroweak baryogenesis is the presence of a strong first-order phase transition in the breaking of the electroweak symmetry in the early universe
The channel with the highest sensitivity to the Higgs self-coupling and the HHWW coupling at CLIC is the bbbbdecay channel of HHννproduction at 3 TeV, where the total cross-section measurement as well as differential distributions can be used to extract the couplings
Summary
Where μ is proportional to the Higgs boson mass and λ is the Higgs self-coupling. This implies a fixed relation m2H = λv between the mass and the self-coupling, with the vacuum expectation value v. The high-energy stages of CLIC with centre-of-mass energies of 1.5 and 3 TeV provide the opportunity to access directly the trilinear Higgs self-coupling in double Higgs boson production. In a full Effective Field Theory approach, other operators apart from the one modifying the triple Higgs vertex can contribute to the same final state As these operators are themselves constrained by other measurements, e.g. single Higgs boson production channels, a global fit approach as studied in [20] is appropriate. This paper investigates the prospects for extracting the trilinear Higgs self-coupling at CLIC in double Higgs boson production at the high-energy stages of CLIC.
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