Abstract
The Compact Linear Collider (CLIC) is an option for a future {mathrm{e}^{+}}{mathrm{e}^{-}} collider operating at centre-of-mass energies up to 3,text {TeV} , providing sensitivity to a wide range of new physics phenomena and precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of CLIC operating at three energy stages: sqrt{s} = 350,text {GeV} , 1.4 and 3,text {TeV} . The initial stage of operation allows the study of Higgs boson production in Higgsstrahlung ({mathrm{e}^{+}}{mathrm{e}^{-}} rightarrow {mathrm{Z}} {mathrm{H}} ) and {mathrm{W}} {mathrm{W}} -fusion ({mathrm{e}^{+}}{mathrm{e}^{-}} rightarrow {mathrm{H}} {{nu }}_{!mathrm{e}} {bar{{nu }}}_{!mathrm{e}} ), resulting in precise measurements of the production cross sections, the Higgs total decay width varGamma _{{mathrm{H}}}, and model-independent determinations of the Higgs couplings. Operation at sqrt{s} > 1,text {TeV} provides high-statistics samples of Higgs bosons produced through {mathrm{W}} {mathrm{W}} -fusion, enabling tight constraints on the Higgs boson couplings. Studies of the rarer processes {mathrm{e}^{+}}{mathrm{e}^{-}} rightarrow mathrm{t} {bar{mathrm{t}}} {mathrm{H}} and {mathrm{e}^{+}}{mathrm{e}^{-}} rightarrow {mathrm{H}} {mathrm{H}} {{nu }}_{!mathrm{e}} {bar{{nu }}}_{!mathrm{e}} allow measurements of the top Yukawa coupling and the Higgs boson self-coupling. This paper presents detailed studies of the precision achievable with Higgs measurements at CLIC and describes the interpretation of these measurements in a global fit.
Highlights
The trilinear Higgs self-coupling can be measured through the e+e− → ZHH The e+e− → ZHH process an√d e+e− → HHνeνe at s = 500 GeV has processes. been studied in the context of the International Linear Collider (ILC), where the results show that a v√esry≥la1rgTeeiVnt,etghreatseednlsuitmiviintyosfiotyr tihserepqruoicreesds[e2+5e].−H→oweHvHerνfeoνer increases with increasing centre-of-mass energy and the measurement of the Higgs boson self-coupling forms a central part of the Compact Linear Collider (CLIC) Higgs physics programme
The results presented in this paper are based on detailed Monte Carlo (MC) simulation studies including the generation of a complete set of relevant SM background processes, Geant4 [26,27] based simulations of the CLIC detector concepts, and a full reconstruction of the simulated events
Even for these very large modifications of the Higgs branching ratios over a wide range of final-state topologies – including the extreme cases highlighted at the bottom of Table 8 such as H → WW∗ → qqqq, which has six jets in the final state, and H → WW∗ → τντν, which has a lot of missing energy – the resulting biases in the extracted total ZH cross section are less than 1%
Summary
The experimental environment at CLIC is characterised by challenging conditions imposed by the CLIC accelerator technology, by detector concepts optimised for the precise reconstruction of complex final states in the multi-TeV energy range, and by the operation in several energy stages to maximise the physics potential
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
