Abstract
High-energy lepton colliders with a centre-of-mass energy in the multi-TeV range are currently considered among the most challenging and far-reaching future accelerator projects. Studies performed so far have mostly focused on the reach for new phenomena in lepton-antilepton annihilation channels. In this work we observe that starting from collider energies of a few TeV, electroweak (EW) vector boson fusion/scattering (VBF) at lepton colliders becomes the dominant production mode for all Standard Model processes relevant to studying the EW sector. In many cases we find that this also holds for new physics. We quantify the size and the growth of VBF cross sections with collider energy for a number of SM and new physics processes. By considering luminosity scenarios achievable at a muon collider, we conclude that such a machine would effectively be a “high-luminosity weak boson collider,” and subsequently offer a wide range of opportunities to precisely measure EW and Higgs couplings as well as discover new particles.
Highlights
Standing out among the important results that the Large Hadron Collider (LHC) has far delivered are the discovery of the Higgs boson (H) and the measurements of its properties
In this work we observe that starting from collider energies of a few TeV, electroweak (EW) vector boson fusion/scattering (VBF) at lepton colliders becomes the dominant production mode for all Standard Model processes relevant to studying the EW sector
√ At a s = 14 TeV muon collider, we report that the anticipated sensitivity on the individual operators at 68% confidence level (CL) from measuring single Higgs production, as well as from double and triple Higgs production are
Summary
Standing out among the important results that the Large Hadron Collider (LHC) has far delivered are the discovery of the Higgs boson (H) and the measurements of its properties. While well-established for (heavy) Higgs production [17,18,19,20,21] and more recently for the production of heavy singlet scalars [15], we anticipate that this behavior holds more broadly for all Standard Model (SM) final states relevant to studying the EW sector and/or the direct search of (not too heavy) new physics To this aim, we present a systematic exploration of SM processes featuring W , Z, H bosons and top quarks t in the final state. We do this by exploring in detail limits that can be obtained in the context of the SMEFT by measuring HH and HHH production as well as final states involving the top quarks and weak bosons.
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