Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing
Abstract We consider two-loop QCD corrections to the element Γ 12 q $$ {\Gamma}_{12}^q $$ of the decay matrix in B q − B ¯ q $$ {\overline{B}}_q $$ mixing, q = d, s, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2021)043 |
| _version_ | 1818601159458291712 |
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| author | Marvin Gerlach Ulrich Nierste Vladyslav Shtabovenko Matthias Steinhauser |
| author_facet | Marvin Gerlach Ulrich Nierste Vladyslav Shtabovenko Matthias Steinhauser |
| author_sort | Marvin Gerlach |
| collection | DOAJ |
| description | Abstract We consider two-loop QCD corrections to the element Γ 12 q $$ {\Gamma}_{12}^q $$ of the decay matrix in B q − B ¯ q $$ {\overline{B}}_q $$ mixing, q = d, s, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator and constitute the next step towards a theory prediction for the width difference ∆Γ s matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in m c /m b up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase ∆Γ s . |
| first_indexed | 2024-12-16T12:46:57Z |
| format | Article |
| id | doaj.art-dab329f6aaae48edaad461cfba4e8c08 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T12:46:57Z |
| publishDate | 2021-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-dab329f6aaae48edaad461cfba4e8c082022-12-21T22:31:16ZengSpringerOpenJournal of High Energy Physics1029-84792021-07-012021712110.1007/JHEP07(2021)043Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixingMarvin Gerlach0Ulrich Nierste1Vladyslav Shtabovenko2Matthias Steinhauser3Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT)Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT)Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT)Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT)Abstract We consider two-loop QCD corrections to the element Γ 12 q $$ {\Gamma}_{12}^q $$ of the decay matrix in B q − B ¯ q $$ {\overline{B}}_q $$ mixing, q = d, s, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator and constitute the next step towards a theory prediction for the width difference ∆Γ s matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in m c /m b up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase ∆Γ s .https://doi.org/10.1007/JHEP07(2021)043NLO Computations |
| spellingShingle | Marvin Gerlach Ulrich Nierste Vladyslav Shtabovenko Matthias Steinhauser Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing Journal of High Energy Physics NLO Computations |
| title | Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing |
| title_full | Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing |
| title_fullStr | Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing |
| title_full_unstemmed | Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing |
| title_short | Two-loop QCD penguin contribution to the width difference in B s − B ¯ s $$ {\overline{B}}_s $$ mixing |
| title_sort | two loop qcd penguin contribution to the width difference in b s b ¯ s overline b s mixing |
| topic | NLO Computations |
| url | https://doi.org/10.1007/JHEP07(2021)043 |
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