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<p>Linear Standard Model (SM) extensions, defined as new particles that can couple linearly to SM fields, form a motivated and finite set of simplified models for exploring phenomenology Beyond the SM (BSM). Heavy BSM particles may be integrated out to obtain their low-energy effects in the SM Effective Field Theory (SMEFT) parametrised by the Wilson coefficients of higher-dimensional operators. We compute and map the dimension-6 SMEFT operator structure of all scalar and fermion linear SM extensions up to one-loop order, thus extending the existing tree-level dictionary of results. Explicit analytic matching expressions for the Wilson coefficients are provided as both Python and Mathematica code in a GitHub repository accessible through links embedded in our main table for each coefficient and within a Python package. We apply our map to highlight the sensitivity to heavy new physics of a <i>Z</i>-pole run at a future Tera-<i>Z</i> factory; at one loop, with unit couplings, all linear SM extensions can be indirectly probed by electroweak precision measurements up to <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>10</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{O}(10) \)</EquationSource> </InlineEquation> TeV.</p>

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Linear Standard Model extensions in the SMEFT at one loop and Tera-Z

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月11日

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  • John Gargalionis,
  • Jérémie Quevillon,
  • Pham Ngoc Hoa Vuong,
  • Tevong You

摘要

Linear Standard Model (SM) extensions, defined as new particles that can couple linearly to SM fields, form a motivated and finite set of simplified models for exploring phenomenology Beyond the SM (BSM). Heavy BSM particles may be integrated out to obtain their low-energy effects in the SM Effective Field Theory (SMEFT) parametrised by the Wilson coefficients of higher-dimensional operators. We compute and map the dimension-6 SMEFT operator structure of all scalar and fermion linear SM extensions up to one-loop order, thus extending the existing tree-level dictionary of results. Explicit analytic matching expressions for the Wilson coefficients are provided as both Python and Mathematica code in a GitHub repository accessible through links embedded in our main table for each coefficient and within a Python package. We apply our map to highlight the sensitivity to heavy new physics of a Z-pole run at a future Tera-Z factory; at one loop, with unit couplings, all linear SM extensions can be indirectly probed by electroweak precision measurements up to O 10 \( \mathcal{O}(10) \) TeV.