On determining α s (m Z ) from dijets in e + e − thrust
Abstract We update a previous N3LL′+ O α s 3 $$ \mathcal{O}\left({\alpha}_s^3\right) $$ determination of the strong coupling from a global fit to thrust data by including newly available perturbative ingredients, upgrading the renormalization scales to include a fully canonical scaling region, and i...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP07(2025)249 |
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| author | Miguel A. Benitez André H. Hoang Vicent Mateu Iain W. Stewart Gherardo Vita |
| author_facet | Miguel A. Benitez André H. Hoang Vicent Mateu Iain W. Stewart Gherardo Vita |
| author_sort | Miguel A. Benitez |
| collection | DOAJ |
| description | Abstract We update a previous N3LL′+ O α s 3 $$ \mathcal{O}\left({\alpha}_s^3\right) $$ determination of the strong coupling from a global fit to thrust data by including newly available perturbative ingredients, upgrading the renormalization scales to include a fully canonical scaling region, and implementing the log resummation in a way which ensures the integrated cross section is unaffected by the leading 1/Q hadronization power corrections. Detailed discussions are provided concerning the stability of the results under variations of the fit range and the importance of summing up higher-order logarithmic terms for convergence and stability. We show that high-precision results can be achieved even when carrying out a more conservative fit by restricting the dataset to a region which is more clearly dominated by dijet events. This leads to α s (m Z ) = 0.1136 ± 0.0012 with χ 2/dof = 0.86, fully compatible with earlier results using a larger fit range. We also demonstrate that a number of additional effects associated to power corrections have a small impact on this fit result, including modifications to the renormalon substraction scheme for dijet power corrections and the inclusion of three-jet power correction models. The fit is also shown to provide very good agreement with data outside the fit range. |
| format | Article |
| id | doaj-art-e09ce1b1ee09437ca4f196aa8140ef7f |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-e09ce1b1ee09437ca4f196aa8140ef7f2025-08-20T04:01:42ZengSpringerOpenJournal of High Energy Physics1029-84792025-07-012025717210.1007/JHEP07(2025)249On determining α s (m Z ) from dijets in e + e − thrustMiguel A. Benitez0André H. Hoang1Vicent Mateu2Iain W. Stewart3Gherardo Vita4Departamento de Física Fundamental e IUFFyM, Universidad de SalamancaFaculty of Physics, University of ViennaDepartamento de Física Fundamental e IUFFyM, Universidad de SalamancaFaculty of Physics, University of ViennaCERN, Theoretical Physics DepartmentAbstract We update a previous N3LL′+ O α s 3 $$ \mathcal{O}\left({\alpha}_s^3\right) $$ determination of the strong coupling from a global fit to thrust data by including newly available perturbative ingredients, upgrading the renormalization scales to include a fully canonical scaling region, and implementing the log resummation in a way which ensures the integrated cross section is unaffected by the leading 1/Q hadronization power corrections. Detailed discussions are provided concerning the stability of the results under variations of the fit range and the importance of summing up higher-order logarithmic terms for convergence and stability. We show that high-precision results can be achieved even when carrying out a more conservative fit by restricting the dataset to a region which is more clearly dominated by dijet events. This leads to α s (m Z ) = 0.1136 ± 0.0012 with χ 2/dof = 0.86, fully compatible with earlier results using a larger fit range. We also demonstrate that a number of additional effects associated to power corrections have a small impact on this fit result, including modifications to the renormalon substraction scheme for dijet power corrections and the inclusion of three-jet power correction models. The fit is also shown to provide very good agreement with data outside the fit range.https://doi.org/10.1007/JHEP07(2025)249Effective Field Theories of QCDThe Strong Coupling |
| spellingShingle | Miguel A. Benitez André H. Hoang Vicent Mateu Iain W. Stewart Gherardo Vita On determining α s (m Z ) from dijets in e + e − thrust Journal of High Energy Physics Effective Field Theories of QCD The Strong Coupling |
| title | On determining α s (m Z ) from dijets in e + e − thrust |
| title_full | On determining α s (m Z ) from dijets in e + e − thrust |
| title_fullStr | On determining α s (m Z ) from dijets in e + e − thrust |
| title_full_unstemmed | On determining α s (m Z ) from dijets in e + e − thrust |
| title_short | On determining α s (m Z ) from dijets in e + e − thrust |
| title_sort | on determining α s m z from dijets in e e thrust |
| topic | Effective Field Theories of QCD The Strong Coupling |
| url | https://doi.org/10.1007/JHEP07(2025)249 |
| work_keys_str_mv | AT miguelabenitez ondeterminingasmzfromdijetsineethrust AT andrehhoang ondeterminingasmzfromdijetsineethrust AT vicentmateu ondeterminingasmzfromdijetsineethrust AT iainwstewart ondeterminingasmzfromdijetsineethrust AT gherardovita ondeterminingasmzfromdijetsineethrust |