Scholarlink

<p>This work is an extension of a previous publication [1] where we fitted the strong coupling <i>α</i><sub><i>s</i></sub> together with the non-perturbative parameter <i>α</i><sub>0</sub> from event-shape and jet-shape distributions using power corrections computed in the three-jet region. In ref. [1] only ALEPH data at the <i>Z</i>-pole were used in the fit. Here, instead, we include a large data sample from various <i>e</i><sup>+</sup><i>e</i><sup>−</sup> experiments at energies ranging from 22 to 207 GeV and revisited the treatment of theoretical uncertainties. We find that the inclusion of different energies, while not changing the central fit result considerably, helps to disentangle the dependence of perturbative and non-perturbative corrections. Our best fit result is <i>α</i><sub><i>s</i></sub>(<i>M</i><sub><i>Z</i></sub>) = <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26516_Article_IEq1.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="130" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msubsup> <mn>0.1181</mn> <mrow> <mo>−</mo> <mn>0.0005</mn> <mo>−</mo> <mn>0.0021</mn> </mrow> <mrow> <mo>+</mo> <mn>0.0002</mn> <mo>+</mo> <mn>0.0018</mn> </mrow> </msubsup> </math></EquationSource> <EquationSource Format="TEX">\( {0.1181}_{-0.0005-0.0021}^{+0.0002+0.0018} \)</EquationSource> </InlineEquation>, where the first error includes experimental uncertainties and the second one includes uncertainties associated with scale variation, mass effects, fit limits, non-perturbative schemes and non- perturbative uncertainties.</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

Fits of αs from event-shapes in the three-jet region: extension to all energies

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月20日

查看全文
  • Paolo Nason,
  • Giulia Zanderighi

摘要

This work is an extension of a previous publication [1] where we fitted the strong coupling αs together with the non-perturbative parameter α0 from event-shape and jet-shape distributions using power corrections computed in the three-jet region. In ref. [1] only ALEPH data at the Z-pole were used in the fit. Here, instead, we include a large data sample from various e+e− experiments at energies ranging from 22 to 207 GeV and revisited the treatment of theoretical uncertainties. We find that the inclusion of different energies, while not changing the central fit result considerably, helps to disentangle the dependence of perturbative and non-perturbative corrections. Our best fit result is αs(MZ) = 0.1181 − 0.0005 − 0.0021 + 0.0002 + 0.0018 \( {0.1181}_{-0.0005-0.0021}^{+0.0002+0.0018} \) , where the first error includes experimental uncertainties and the second one includes uncertainties associated with scale variation, mass effects, fit limits, non-perturbative schemes and non- perturbative uncertainties.