Fits of α s from event-shapes in the three-jet region: extension to all energies
Abstract This work is an extension of a previous publication [1] where we fitted the strong coupling α s together with the non-perturbative parameter α 0 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 w...
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SpringerOpen
2025-06-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP06(2025)200 |
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| author | Paolo Nason Giulia Zanderighi |
| author_facet | Paolo Nason Giulia Zanderighi |
| author_sort | Paolo Nason |
| collection | DOAJ |
| description | Abstract This work is an extension of a previous publication [1] where we fitted the strong coupling α s together with the non-perturbative parameter α 0 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 α s (M Z ) = 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. |
| format | Article |
| id | doaj-art-f0d7c881b1cf4dc28832c42d05d33df5 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-f0d7c881b1cf4dc28832c42d05d33df52025-08-20T03:45:44ZengSpringerOpenJournal of High Energy Physics1029-84792025-06-012025612110.1007/JHEP06(2025)200Fits of α s from event-shapes in the three-jet region: extension to all energiesPaolo Nason0Giulia Zanderighi1Università di Milano-Bicocca and INFN, Sezione di Milano-BicoccaMax-Planck-Institut für PhysikAbstract This work is an extension of a previous publication [1] where we fitted the strong coupling α s together with the non-perturbative parameter α 0 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 α s (M Z ) = 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.https://doi.org/10.1007/JHEP06(2025)200The Strong CouplingParton ShowerRenormalization GroupSpecific QCD Phenomenology |
| spellingShingle | Paolo Nason Giulia Zanderighi Fits of α s from event-shapes in the three-jet region: extension to all energies Journal of High Energy Physics The Strong Coupling Parton Shower Renormalization Group Specific QCD Phenomenology |
| title | Fits of α s from event-shapes in the three-jet region: extension to all energies |
| title_full | Fits of α s from event-shapes in the three-jet region: extension to all energies |
| title_fullStr | Fits of α s from event-shapes in the three-jet region: extension to all energies |
| title_full_unstemmed | Fits of α s from event-shapes in the three-jet region: extension to all energies |
| title_short | Fits of α s from event-shapes in the three-jet region: extension to all energies |
| title_sort | fits of α s from event shapes in the three jet region extension to all energies |
| topic | The Strong Coupling Parton Shower Renormalization Group Specific QCD Phenomenology |
| url | https://doi.org/10.1007/JHEP06(2025)200 |
| work_keys_str_mv | AT paolonason fitsofasfromeventshapesinthethreejetregionextensiontoallenergies AT giuliazanderighi fitsofasfromeventshapesinthethreejetregionextensiontoallenergies |