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<p>Future lepton colliders, such as those based on linear <i>e</i><sup>+</sup><i>e</i><sup>−</sup> or circular <i>μ</i><sup>+</sup><i>μ</i><sup>−</sup> accelerators, are expected to attain centre-of-mass energies in the multi-TeV range. In this regime the impact of QED and of weak radiation, in both the initial and the final state, can become a leading effect. By employing a general framework presented in a companion paper — suitable for any flavour of colliding leptons — we improve next-to-leading order electroweak predictions by including higher-order contributions, which encompass, but are not limited to, vector-boson-fusion processes. We apply this approach to the study of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_27116_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi>t</mi> <mover accent="true"> <mi>t</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( t\overline{t} \)</EquationSource> </InlineEquation> and <i>W</i> <sup>+</sup><i>W</i><sup>−</sup> production at a muon collider operating at centre-of-mass energies up to 10 TeV. We show that such an approach, where both QED and weak contributions are included at fixed order, in addition to the all-order resummation of initial-state QED effects, can provide predictions for arbitrary observables in all of the phase space which are precise at the percent level.</p>

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Precision phenomenology at multi-TeV muon colliders

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月3日

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  • Stefano Frixione,
  • Fabio Maltoni,
  • Davide Pagani,
  • Marco Zaro

摘要

Future lepton colliders, such as those based on linear e+e− or circular μ+μ− accelerators, are expected to attain centre-of-mass energies in the multi-TeV range. In this regime the impact of QED and of weak radiation, in both the initial and the final state, can become a leading effect. By employing a general framework presented in a companion paper — suitable for any flavour of colliding leptons — we improve next-to-leading order electroweak predictions by including higher-order contributions, which encompass, but are not limited to, vector-boson-fusion processes. We apply this approach to the study of t t ¯ \( t\overline{t} \) and W +W− production at a muon collider operating at centre-of-mass energies up to 10 TeV. We show that such an approach, where both QED and weak contributions are included at fixed order, in addition to the all-order resummation of initial-state QED effects, can provide predictions for arbitrary observables in all of the phase space which are precise at the percent level.