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<p>Collider processes at the highest available partonic center-of-mass energies — 10 TeV and above — exhibit a new regime of electroweak interactions where electroweak gauge bosons mostly act as quasi-massless partons in vector boson fusion processes. We scrutinize these processes using the Equivalent Vector boson Approximation (EVA) based on its implementation in the Monte Carlo generator framework W<span>hizard</span>. Using a variety of important physics processes, including top pairs, Higgs pairs, neutrino pairs, and vector boson pairs, we study the behavior of processes initiated by transverse and longitudinal vector bosons, both <i>W</i> and <i>Z</i> induced. By considering several distributions for each process, we conclude that: there is no universal, process-independent prescription which minimizes the discrepancies between EVA- and matrix-element-based predictions; even by resorting to process-by-process prescriptions, we typically observe significant observable-dependent effects; the uncertainties associated with parameter dependencies in the EVA can be as large as <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathcal{O}(100\%)\)</EquationSource> </InlineEquation>, and can only possibly be reduced by careful process-dependent kinematical selections.</p>

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EVAluation of the Equivalent Vector boson Approximation at highest energy colliders

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月4日

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  • Benjamin Dahlén,
  • Maximilian Löschner,
  • Krzysztof Mękała,
  • Jürgen Reuter,
  • Panagiotis Stylianou

摘要

Collider processes at the highest available partonic center-of-mass energies — 10 TeV and above — exhibit a new regime of electroweak interactions where electroweak gauge bosons mostly act as quasi-massless partons in vector boson fusion processes. We scrutinize these processes using the Equivalent Vector boson Approximation (EVA) based on its implementation in the Monte Carlo generator framework Whizard. Using a variety of important physics processes, including top pairs, Higgs pairs, neutrino pairs, and vector boson pairs, we study the behavior of processes initiated by transverse and longitudinal vector bosons, both W and Z induced. By considering several distributions for each process, we conclude that: there is no universal, process-independent prescription which minimizes the discrepancies between EVA- and matrix-element-based predictions; even by resorting to process-by-process prescriptions, we typically observe significant observable-dependent effects; the uncertainties associated with parameter dependencies in the EVA can be as large as \(\mathcal{O}(100\%)\) , and can only possibly be reduced by careful process-dependent kinematical selections.