αs from an improved τ vector isovector spectral function
After discussing difficulties in determining αs from tau decay due to the existence of Duality Violations and the associated asymptotic nature of the OPE, we describe a new determination based on an improved vector isovector spectral function, now based solely on experimental input, obtained by (i)...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2022-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03014.pdf |
| _version_ | 1797951161133694976 |
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| author | Boito Diogo Golterman Maarten Maltman Kim Peris Santiago Rodrigues Marcus V. Schaaf Wilder |
| author_facet | Boito Diogo Golterman Maarten Maltman Kim Peris Santiago Rodrigues Marcus V. Schaaf Wilder |
| author_sort | Boito Diogo |
| collection | DOAJ |
| description | After discussing difficulties in determining αs from tau decay due to the existence of Duality Violations and the associated asymptotic nature of the OPE, we describe a new determination based on an improved vector isovector spectral function, now based solely on experimental input, obtained by (i) combining ALEPH and OPAL results for 2π + 4π and (ii) replacing K−K0 and higher-multiplicity exclusive-mode contributions, both previously estimated using Monte Carlo, with new experimental BaBar results for K−K0 and results implied by e+e− cross sections and CVC for the higher-multiplicity modes. We find αs(mτ) = 0.3077±0.0075, which corresponds to αs(mZ) = 0.1171±0.0010. Finally, we comment on some of the shortcomings in the criticism of our approach by Pich and Rodriguez-Sanchez. |
| first_indexed | 2024-04-10T22:26:17Z |
| format | Article |
| id | doaj.art-765344334f454582bb065faa9344fd85 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-10T22:26:17Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-765344334f454582bb065faa9344fd852023-01-17T09:14:39ZengEDP SciencesEPJ Web of Conferences2100-014X2022-01-012740301410.1051/epjconf/202227403014epjconf_confxv2022_03014αs from an improved τ vector isovector spectral functionBoito Diogo0Golterman Maarten1Maltman Kim2Peris Santiago3Rodrigues Marcus V.4Schaaf Wilder5Instituto de Física de São CarlosDepartment of Physics and Astronomy, San Francisco State UniversityDepartment of Mathematics and Statistics, York University TorontoDepartment of Physics and IFAE-BIST, Universitat Autònoma de BarcelonaDeutsches Elektronen-Synchrotron (DESY)Department of Physics, University of WashingtonAfter discussing difficulties in determining αs from tau decay due to the existence of Duality Violations and the associated asymptotic nature of the OPE, we describe a new determination based on an improved vector isovector spectral function, now based solely on experimental input, obtained by (i) combining ALEPH and OPAL results for 2π + 4π and (ii) replacing K−K0 and higher-multiplicity exclusive-mode contributions, both previously estimated using Monte Carlo, with new experimental BaBar results for K−K0 and results implied by e+e− cross sections and CVC for the higher-multiplicity modes. We find αs(mτ) = 0.3077±0.0075, which corresponds to αs(mZ) = 0.1171±0.0010. Finally, we comment on some of the shortcomings in the criticism of our approach by Pich and Rodriguez-Sanchez.https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03014.pdf |
| spellingShingle | Boito Diogo Golterman Maarten Maltman Kim Peris Santiago Rodrigues Marcus V. Schaaf Wilder αs from an improved τ vector isovector spectral function EPJ Web of Conferences |
| title | αs from an improved τ vector isovector spectral function |
| title_full | αs from an improved τ vector isovector spectral function |
| title_fullStr | αs from an improved τ vector isovector spectral function |
| title_full_unstemmed | αs from an improved τ vector isovector spectral function |
| title_short | αs from an improved τ vector isovector spectral function |
| title_sort | αs from an improved τ vector isovector spectral function |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03014.pdf |
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