Quark-hadron duality at work: lifetimes of bottom baryons
Abstract In the 1990s, very low experimental values for the lifetime ratio τ(Λ b )/τ(B d ) triggered a considerable amount of doubt in the applicability of the heavy quark expansion (HQE), which is based on the assumption of quark-hadron duality (QHD) for inclusive total decay rates. However, these...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-04-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP04(2023)034 |
| _version_ | 1797769743486156800 |
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| author | James Gratrex Alexander Lenz Blaženka Melić Ivan Nišandžić Maria Laura Piscopo Aleksey V. Rusov |
| author_facet | James Gratrex Alexander Lenz Blaženka Melić Ivan Nišandžić Maria Laura Piscopo Aleksey V. Rusov |
| author_sort | James Gratrex |
| collection | DOAJ |
| description | Abstract In the 1990s, very low experimental values for the lifetime ratio τ(Λ b )/τ(B d ) triggered a considerable amount of doubt in the applicability of the heavy quark expansion (HQE), which is based on the assumption of quark-hadron duality (QHD) for inclusive total decay rates. However, these low values turned out to be the result of purely experimental problems, and the current HFLAV average reads τ(Λ b )/τ(B d ) = 0.969(6). In this work, we present the Standard Model predictions for the b-baryon lifetimes within the framework of the HQE. In particular, we include for the first time the contribution of the Darwin term and we update the estimates for the matrix elements of the dimension-six four-quark operators. Within experimental and theoretical uncertainties, we find excellent agreement between the data and the HQE predictions, and thus no indication for any visible violation of QHD. Our numerical results can be summarised by the ratios τ(Λ b )/τ(B d ) = 0.955(14), τ Ω b − $$ \tau \left({\varOmega}_b^{-}\right) $$ /τ(B d ) = 1.081(42), and τ Ξ b 0 / τ Ξ b − $$ \tau \left({\Xi}_b^0\right)/\tau \left({\Xi}_b^{-}\right) $$ = 0.929(28). |
| first_indexed | 2024-03-12T21:13:25Z |
| format | Article |
| id | doaj.art-e7f2e9cce08c4e75a9df008d681f992a |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-12T21:13:25Z |
| publishDate | 2023-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-e7f2e9cce08c4e75a9df008d681f992a2023-07-30T11:03:51ZengSpringerOpenJournal of High Energy Physics1029-84792023-04-012023413610.1007/JHEP04(2023)034Quark-hadron duality at work: lifetimes of bottom baryonsJames Gratrex0Alexander Lenz1Blaženka Melić2Ivan Nišandžić3Maria Laura Piscopo4Aleksey V. Rusov5Division of Theoretical Physics, Ruđer Bošković InstitutePhysik Department, Universität SiegenDivision of Theoretical Physics, Ruđer Bošković InstituteDivision of Theoretical Physics, Ruđer Bošković InstitutePhysik Department, Universität SiegenPhysik Department, Universität SiegenAbstract In the 1990s, very low experimental values for the lifetime ratio τ(Λ b )/τ(B d ) triggered a considerable amount of doubt in the applicability of the heavy quark expansion (HQE), which is based on the assumption of quark-hadron duality (QHD) for inclusive total decay rates. However, these low values turned out to be the result of purely experimental problems, and the current HFLAV average reads τ(Λ b )/τ(B d ) = 0.969(6). In this work, we present the Standard Model predictions for the b-baryon lifetimes within the framework of the HQE. In particular, we include for the first time the contribution of the Darwin term and we update the estimates for the matrix elements of the dimension-six four-quark operators. Within experimental and theoretical uncertainties, we find excellent agreement between the data and the HQE predictions, and thus no indication for any visible violation of QHD. Our numerical results can be summarised by the ratios τ(Λ b )/τ(B d ) = 0.955(14), τ Ω b − $$ \tau \left({\varOmega}_b^{-}\right) $$ /τ(B d ) = 1.081(42), and τ Ξ b 0 / τ Ξ b − $$ \tau \left({\Xi}_b^0\right)/\tau \left({\Xi}_b^{-}\right) $$ = 0.929(28).https://doi.org/10.1007/JHEP04(2023)034Bottom QuarksSemi-Leptonic Decays |
| spellingShingle | James Gratrex Alexander Lenz Blaženka Melić Ivan Nišandžić Maria Laura Piscopo Aleksey V. Rusov Quark-hadron duality at work: lifetimes of bottom baryons Journal of High Energy Physics Bottom Quarks Semi-Leptonic Decays |
| title | Quark-hadron duality at work: lifetimes of bottom baryons |
| title_full | Quark-hadron duality at work: lifetimes of bottom baryons |
| title_fullStr | Quark-hadron duality at work: lifetimes of bottom baryons |
| title_full_unstemmed | Quark-hadron duality at work: lifetimes of bottom baryons |
| title_short | Quark-hadron duality at work: lifetimes of bottom baryons |
| title_sort | quark hadron duality at work lifetimes of bottom baryons |
| topic | Bottom Quarks Semi-Leptonic Decays |
| url | https://doi.org/10.1007/JHEP04(2023)034 |
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