Consistent measurements of alpha(s) from precise oriented event shape distributions
An updated analysis using about 1.5 million events recorded at √s = Mz with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured as a function of the polar angle of the thrust axis. The data are compared to theoretical calculations in sc...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2000
|
| _version_ | 1826268740801527808 |
|---|---|
| author | Abreu, P Adam, W Adye, T Adzic, P Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, E Augustinus, A Baillon, P |
| author_facet | Abreu, P Adam, W Adye, T Adzic, P Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, E Augustinus, A Baillon, P |
| author_sort | Abreu, P |
| collection | OXFORD |
| description | An updated analysis using about 1.5 million events recorded at √s = Mz with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured as a function of the polar angle of the thrust axis. The data are compared to theoretical calculations in script O(α2s) including the event orientation. A combined fit of αs and of the renormalization scale xμ in script O(α2s) yields an excellent description of the high statistics data. The weighted average from 18 observables including quark mass effects and correlations is αs(M2z) = 0.1174±0.0026. The final result, derived from the jet cone energy fraction, the observable with the smallest theoretical and experimental uncertainty, is αs(M2z) = 0.1180 ± 0.0006(exp.) ± 0.0013(hadr.) ± 0.0008(scale) ± 0.0007(mass). Further studies include an αs determination using theoretical predictions in the next-to-leading log approximation (NLLA), matched NLLA and script O(α2s) predictions as well as theoretically motivated optimized scale setting methods. The influence of higher order contributions was also investigated by using the method of Padé approximants. Average αs values derived from the different approaches are in good agreement. |
| first_indexed | 2024-03-06T21:14:14Z |
| format | Journal article |
| id | oxford-uuid:3f3a22f3-0e96-42e1-b40c-556782ba634c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:14:14Z |
| publishDate | 2000 |
| record_format | dspace |
| spelling | oxford-uuid:3f3a22f3-0e96-42e1-b40c-556782ba634c2022-03-26T14:30:41ZConsistent measurements of alpha(s) from precise oriented event shape distributionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3f3a22f3-0e96-42e1-b40c-556782ba634cEnglishSymplectic Elements at Oxford2000Abreu, PAdam, WAdye, TAdzic, PAlbrecht, ZAlderweireld, TAlekseev, GAlemany, RAllmendinger, TAllport, PAlmehed, SAmaldi, UAmapane, NAmato, SAnassontzis, EAndersson, PAndreazza, AAndringa, SAntilogus, PApel, WArnoud, YAsman, BAugustin, EAugustinus, ABaillon, PAn updated analysis using about 1.5 million events recorded at √s = Mz with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured as a function of the polar angle of the thrust axis. The data are compared to theoretical calculations in script O(α2s) including the event orientation. A combined fit of αs and of the renormalization scale xμ in script O(α2s) yields an excellent description of the high statistics data. The weighted average from 18 observables including quark mass effects and correlations is αs(M2z) = 0.1174±0.0026. The final result, derived from the jet cone energy fraction, the observable with the smallest theoretical and experimental uncertainty, is αs(M2z) = 0.1180 ± 0.0006(exp.) ± 0.0013(hadr.) ± 0.0008(scale) ± 0.0007(mass). Further studies include an αs determination using theoretical predictions in the next-to-leading log approximation (NLLA), matched NLLA and script O(α2s) predictions as well as theoretically motivated optimized scale setting methods. The influence of higher order contributions was also investigated by using the method of Padé approximants. Average αs values derived from the different approaches are in good agreement. |
| spellingShingle | Abreu, P Adam, W Adye, T Adzic, P Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, E Augustinus, A Baillon, P Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title | Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title_full | Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title_fullStr | Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title_full_unstemmed | Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title_short | Consistent measurements of alpha(s) from precise oriented event shape distributions |
| title_sort | consistent measurements of alpha s from precise oriented event shape distributions |
| work_keys_str_mv | AT abreup consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT adamw consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT adyet consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT adzicp consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT albrechtz consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT alderweireldt consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT alekseevg consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT alemanyr consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT allmendingert consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT allportp consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT almeheds consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT amaldiu consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT amapanen consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT amatos consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT anassontzise consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT anderssonp consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT andreazzaa consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT andringas consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT antilogusp consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT apelw consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT arnoudy consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT asmanb consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT augustine consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT augustinusa consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions AT baillonp consistentmeasurementsofalphasfrompreciseorientedeventshapedistributions |