Abstract
AbstractThe 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 $$\sqrt{s}$$
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, $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$
e
+
e
-
→
HH
ν
ν
¯
. 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 $$\mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}}$$
b
b
¯
b
b
¯
and $$\mathrm{b}\bar{\mathrm{b}}\mathrm{W}\mathrm{W}^{*}$$
b
b
¯
W
W
∗
using full detector simulation including all relevant backgrounds at $$\sqrt{s}$$
s
= 1.4 TeV with an integrated luminosity of $$\mathcal {L}$$
L
= 2.5 ab$$^{-1}$$
-
1
and at $$\sqrt{s}$$
s
= 3 TeV with $$\mathcal {L}$$
L
= 5 ab$$^{-1}$$
-
1
. Combining $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$
e
+
e
-
→
HH
ν
ν
¯
and ZHH cross-section measurements at 1.4 TeV with differential measurements in $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$
e
+
e
-
→
HH
ν
ν
¯
events at 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of $$-8\%$$
-
8
%
and $$ +11\%$$
+
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 $${\text {H}\text {H}\nu \bar{\nu }}$$
HH
ν
ν
¯
measurement.
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