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.
Highlights
Projections for high-energy hadron machines (100 TeV pp colliders in particular) are already available in the literature [3]
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
We consider a comprehensive set of benchmark scenarios including low-energy lepton machines as well as machines that can run at higher energies (ILC and CLIC)
Summary
We study the precision reach on the trilinear Higgs coupling through the exploitation of single Higgs production measurements. The analysis of single-Higgs production can be relevant for the ILC While this machine could eventually reach a center-of-mass energy of 500 GeV (or even of 1 TeV) in a staged development, its initial low-energy runs can have an impact on the determination of the trilinear Higgs coupling that is worth investigating. As a general circular collider run scenario, we consider the collection of 5 ab−1 of integrated luminosity at 240 GeV and several benchmark luminosities at 350 GeV, namely 0, 200 fb−1 and 1.5 ab−1. Low-energy ILC with 2 ab−1 at 250 GeV, {0, 200 fb−1, 1.5 ab−1} at 350 GeV, and integrated luminosities shared between P (e−, e+) = (∓0.8, ±0.3) beam polarizations.. Later we extend these scenarios to cover a continuous range of luminosities at 240 (250) and 350 GeV
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