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dc.contributor.authorRoloff, Philipp
dc.contributor.authorSchnoor, Ulrike
dc.contributor.authorSimoniello, Rosa
dc.contributor.authorXu, Boruo
dc.date.accessioned2020-12-22T19:01:40Z
dc.date.available2020-12-22T19:01:40Z
dc.date.issued2020-11
dc.date.submitted2019-12-17
dc.identifier.issn1434-6044
dc.identifier.others10052-020-08567-7
dc.identifier.other8567
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/315484
dc.description.abstract<jats:title>Abstract</jats:title><jats:p>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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 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, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mrow> <mml:mtext>HH</mml:mtext> <mml:mi>ν</mml:mi> <mml:mover> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>. 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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>b</mml:mi> <mml:mover> <mml:mrow> <mml:mi>b</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> <mml:mi>b</mml:mi> <mml:mover> <mml:mrow> <mml:mi>b</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>  and <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathrm{b}\bar{\mathrm{b}}\mathrm{W}\mathrm{W}^{*}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>b</mml:mi> <mml:mover> <mml:mrow> <mml:mi>b</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> <mml:mi>W</mml:mi> <mml:msup> <mml:mrow> <mml:mi>W</mml:mi> </mml:mrow> <mml:mrow> <mml:mrow /> <mml:mo>∗</mml:mo> </mml:mrow> </mml:msup> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>  using full detector simulation including all relevant backgrounds at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 1.4 TeV with an integrated luminosity of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathcal {L}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> = 2.5 ab<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> and at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 3 TeV with <jats:inline-formula><jats:alternatives><jats:tex-math>$$\mathcal {L}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> = 5 ab<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{-1}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>. Combining <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mrow> <mml:mtext>HH</mml:mtext> <mml:mi>ν</mml:mi> <mml:mover> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and ZHH  cross-section measurements at 1.4 TeV with differential measurements in <jats:inline-formula><jats:alternatives><jats:tex-math>$$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mtext>e</mml:mtext> <mml:mo>-</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mrow> <mml:mtext>HH</mml:mtext> <mml:mi>ν</mml:mi> <mml:mover> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> events at 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of <jats:inline-formula><jats:alternatives><jats:tex-math>$$-8\%$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>8</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ +11\%$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>11</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> 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 <jats:inline-formula><jats:alternatives><jats:tex-math>$${\text {H}\text {H}\nu \bar{\nu }}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>HH</mml:mtext> <mml:mi>ν</mml:mi> <mml:mover> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> measurement.</jats:p>
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.rightsAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectRegular Article – Experimental Physics
dc.titleDouble Higgs boson production and Higgs self-coupling extraction at CLIC
dc.typeArticle
dc.date.updated2020-12-22T19:01:40Z
prism.issueIdentifier11
prism.publicationNameThe European Physical Journal C
prism.volume80
dc.identifier.doi10.17863/CAM.62591
dcterms.dateAccepted2020-10-18
rioxxterms.versionofrecord10.1140/epjc/s10052-020-08567-7
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidRoloff, Philipp [0000-0001-7378-4350]
dc.contributor.orcidSchnoor, Ulrike [0000-0002-2237-384X]
dc.contributor.orcidSimoniello, Rosa [0000-0003-2042-6394]
dc.identifier.eissn1434-6052
cam.issuedOnline2020-11-02


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Attribution 4.0 International (CC BY 4.0)
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