Scholarlink

<p>A scan of the beam energy across the top quark pair <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mfenced close=")" open="("> <mrow> <mi mathvariant="normal">t</mi> <mover accent="true"> <mi mathvariant="normal">t</mi> <mo stretchy="true">¯</mo> </mover> </mrow> </mfenced> </math></EquationSource> <EquationSource Format="TEX">\( \left(\textrm{t}\overline{\textrm{t}}\right) \)</EquationSource> </InlineEquation> production threshold is part of the program of future Higgs, top, and electroweak factory projects. In this paper, we provide projections for the achievable precision in the top quark mass (<i>m</i><sub>t</sub>), width (Γ<sub>t</sub>), and Yukawa coupling (<i>y</i><sub>t</sub>) at the electron-positron (e<sup>+</sup>e<sup>−</sup>) stage of the Future Circular Collider (FCC-ee). The study includes a detailed assessment of parametric and systematic uncertainties, as well as a rigorous estimate of the effect of point-to-point correlations. We project that <i>m</i><sub>t</sub> and Γ<sub>t</sub> can be determined with an experimental precision of 6.8 and 11.5 MeV, respectively, when <i>m</i><sub>t</sub> is defined in the potential-subtracted (PS) scheme. The impact of theoretical uncertainties due to missing higher orders is found to be of about 35 (25) MeV on <i>m</i><sub>t</sub> (Γ<sub>t</sub>) at N<sup>3</sup>LO in non-relativistic QCD. Therefore, improvements in the theoretical accuracy, which is an active area of development, are key to match the achievable experimental precision at a future e<sup>+</sup>e<sup>−</sup> collider. We also explore the prospects for a measurement of <i>y</i><sub>t</sub> at FCC-ee via a dedicated run above the <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="normal">t</mi> <mover accent="true"> <mi mathvariant="normal">t</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( \textrm{t}\overline{\textrm{t}} \)</EquationSource> </InlineEquation> production threshold.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A detailed study on the prospects for a \( \textrm{t}\overline{\textrm{t}} \) threshold scan in e+e− collisions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月5日

查看全文
  • Matteo M. Defranchis,
  • Jorge de Blas,
  • Ankita Mehta,
  • Michele Selvaggi,
  • Marcel Vos

摘要

A scan of the beam energy across the top quark pair t t ¯ \( \left(\textrm{t}\overline{\textrm{t}}\right) \) production threshold is part of the program of future Higgs, top, and electroweak factory projects. In this paper, we provide projections for the achievable precision in the top quark mass (mt), width (Γt), and Yukawa coupling (yt) at the electron-positron (e+e−) stage of the Future Circular Collider (FCC-ee). The study includes a detailed assessment of parametric and systematic uncertainties, as well as a rigorous estimate of the effect of point-to-point correlations. We project that mt and Γt can be determined with an experimental precision of 6.8 and 11.5 MeV, respectively, when mt is defined in the potential-subtracted (PS) scheme. The impact of theoretical uncertainties due to missing higher orders is found to be of about 35 (25) MeV on mt (Γt) at N3LO in non-relativistic QCD. Therefore, improvements in the theoretical accuracy, which is an active area of development, are key to match the achievable experimental precision at a future e+e− collider. We also explore the prospects for a measurement of yt at FCC-ee via a dedicated run above the t t ¯ \( \textrm{t}\overline{\textrm{t}} \) production threshold.