Abstract
We perform a global effective-field-theory analysis to assess the precision on the determination of the Higgs trilinear self-coupling at future lepton colliders. Two main scenarios are considered, depending on whether the center-of-mass energy of the colliders is sufficient or not to access Higgs pair production processes. Low-energy machines allow for ∼ 40% precision on the extraction of the Higgs trilinear coupling through the exploitation of next-to-leading-order effects in single Higgs measurements, provided that runs at both 240/250 GeV and 350 GeV are available with luminosities in the few attobarns range. A global fit, including possible deviations in other SM couplings, is essential in this case to obtain a robust determination of the Higgs self-coupling. High-energy machines can easily achieve a ∼ 20% precision through Higgs pair production processes. In this case, the impact of additional coupling modifications is milder, although not completely negligible.
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ArXiv ePrint: 1711.03978
On leave from Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain. (Christophe Grojean)
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Di Vita, S., Durieux, G., Grojean, C. et al. A global view on the Higgs self-coupling at lepton colliders. J. High Energ. Phys. 2018, 178 (2018). https://doi.org/10.1007/JHEP02(2018)178
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DOI: https://doi.org/10.1007/JHEP02(2018)178