Abstract
LEP precision on electroweak measurements was sufficient not to hamper the extraction of Higgs couplings at the LHC. But the foreseen permille-level Higgs measure- ments at future lepton colliders might suffer from parametric electroweak uncertainties in the absence of a dedicated electroweak program. We perform a joint, complete and consis- tent effective-field-theory analysis of Higgs and electroweak processes. The full electroweak- sector dependence of the e+e−→ WW production process is notably accounted for, us- ing statistically optimal observables. Up-to-date HL-LHC projections are combined with CEPC, FCC-ee, ILC and CLIC ones. For circular colliders, our results demonstrate the importance of a new Z -pole program for the robust extraction of Higgs couplings. At linear colliders, we show how exploiting multiple polarizations and centre-of-mass energies is crucial to mitigate contaminations from electroweak parameter uncertainties on the Higgs physics program. We also investigate the potential of alternative electroweak measurements to compensate for the lack of direct Z -pole run, considering for instance radiative return to these energies. Conversely, we find that Higgs measurements at linear colliders could improve our knowledge of the Z couplings to electrons.
Highlights
Energy and there is neither technical nor unbearable economical impediments to polarize their beams
Instead of presenting the posterior distributions of the Wilson coefficients that were varied in our fits, we provide the statistics of the posterior distributions of the effective Higgs couplings, anomalous triple gauge couplings (aTGCs) and EW couplings introduced in subsection 2.1
The global reach we obtain on the Higgs and triple-gauge couplings is highlighted in figure 2 for the four future lepton colliders considered: CEPC, FCC-ee, ILC and CLIC
Summary
Introducing our framework, our parametrization of the effective-field-theory space is first presented in subsection 2.1. We provide a brief summary of the future collider run scenarios considered as well as the prospects and measurements used as input to our analysis in subsection 2.2. The information contained in angular distributions of both diboson and Higgsstrahlung production is extracted using statistically optimal observables Pendix D for a brief review), as explained in subsection 2.3 and 2.4. The assumptions made for scaling statistical and systematic uncertainties with beam polarization are explained in subsection 3.2. Our statistical methods for the global fit is described in subsection 2.5
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