A new puzzle in non-leptonic B decays
Abstract We build a set of new observables using closely related non-leptonic penguin-mediated B d and B s decays: B ¯ d , s → K ∗ 0 K ¯ ∗ 0 , B ¯ d , s → K 0 K ¯ 0 , B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0},{\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0,...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-06-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2023)108 |
| _version_ | 1797675944135098368 |
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| author | Aritra Biswas Sébastien Descotes-Genon Joaquim Matias Gilberto Tetlalmatzi-Xolocotzi |
| author_facet | Aritra Biswas Sébastien Descotes-Genon Joaquim Matias Gilberto Tetlalmatzi-Xolocotzi |
| author_sort | Aritra Biswas |
| collection | DOAJ |
| description | Abstract We build a set of new observables using closely related non-leptonic penguin-mediated B d and B s decays: B ¯ d , s → K ∗ 0 K ¯ ∗ 0 , B ¯ d , s → K 0 K ¯ 0 , B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0},{\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0,{\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ together with their CP conjugate partners. These optimised observables are designed to reduce hadronic uncertainties, mainly coming from form factors and power-suppressed contributions, and thus maximize their sensitivity to New Physics (NP). The deviations observed with respect to the Standard Model (SM) in the ratios of branching ratios of B ¯ d , s → K ∗ 0 K ¯ ∗ 0 2.6 σ $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\left(2.6\sigma \right) $$ and B ¯ d , s → K 0 K ¯ 0 2.4 σ $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0\left(2.4\sigma \right) $$ can be explained by simple NP scenarios involving the Wilson coefficients C $$ \mathcal{C} $$ 4 and C $$ \mathcal{C} $$ 6 associated with QCD penguin operators and the coefficient C $$ \mathcal{C} $$ 8g of the chromomagnetic operator. The optimised observables for B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ show distinctive patterns of deviations with respect to their SM predictions under these NP scenarios. The pattern of deviations of individual branching ratios, though affected by significant hadronic uncertainties, suggests that NP is needed both in b → d and b → s transitions. We provide the regions for the Wilson coefficients consistent with both optimised observables and individual branching ratios. The NP scenarios considered to explain the deviations of B ¯ d , s → K ∗ 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K 0 K ¯ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0 $$ can yield deviations up to an order of magnitude among the observables that we introduced for B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ . Probing these new observables experimentally by improving the measurements of individual branching ratios of penguin-mediated decays would confirm the consistency of the deviations already observed and provide a highly valuable hint of NP in the non-leptonic sector. |
| first_indexed | 2024-03-11T22:21:01Z |
| format | Article |
| id | doaj.art-765569a10466408c8292761568563a5d |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-11T22:21:01Z |
| publishDate | 2023-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-765569a10466408c8292761568563a5d2023-09-24T11:04:56ZengSpringerOpenJournal of High Energy Physics1029-84792023-06-012023614810.1007/JHEP06(2023)108A new puzzle in non-leptonic B decaysAritra Biswas0Sébastien Descotes-Genon1Joaquim Matias2Gilberto Tetlalmatzi-Xolocotzi3Universitat Autònoma de Barcelona and Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and TechnologyUniversité Paris-Saclay, CNRS/IN2P3, IJCLabUniversitat Autònoma de Barcelona and Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and TechnologyUniversité Paris-Saclay, CNRS/IN2P3, IJCLabAbstract We build a set of new observables using closely related non-leptonic penguin-mediated B d and B s decays: B ¯ d , s → K ∗ 0 K ¯ ∗ 0 , B ¯ d , s → K 0 K ¯ 0 , B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0},{\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0,{\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ together with their CP conjugate partners. These optimised observables are designed to reduce hadronic uncertainties, mainly coming from form factors and power-suppressed contributions, and thus maximize their sensitivity to New Physics (NP). The deviations observed with respect to the Standard Model (SM) in the ratios of branching ratios of B ¯ d , s → K ∗ 0 K ¯ ∗ 0 2.6 σ $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\left(2.6\sigma \right) $$ and B ¯ d , s → K 0 K ¯ 0 2.4 σ $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0\left(2.4\sigma \right) $$ can be explained by simple NP scenarios involving the Wilson coefficients C $$ \mathcal{C} $$ 4 and C $$ \mathcal{C} $$ 6 associated with QCD penguin operators and the coefficient C $$ \mathcal{C} $$ 8g of the chromomagnetic operator. The optimised observables for B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ show distinctive patterns of deviations with respect to their SM predictions under these NP scenarios. The pattern of deviations of individual branching ratios, though affected by significant hadronic uncertainties, suggests that NP is needed both in b → d and b → s transitions. We provide the regions for the Wilson coefficients consistent with both optimised observables and individual branching ratios. The NP scenarios considered to explain the deviations of B ¯ d , s → K ∗ 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^{\ast 0}{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K 0 K ¯ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^0 $$ can yield deviations up to an order of magnitude among the observables that we introduced for B ¯ d , s → K 0 K ¯ ∗ 0 $$ {\overline{B}}_{d,s}\to {K}^0{\overline{K}}^{\ast 0} $$ and B ¯ d , s → K ¯ 0 K ∗ 0 $$ {\overline{B}}_{d,s}\to {\overline{K}}^0{K}^{\ast 0} $$ . Probing these new observables experimentally by improving the measurements of individual branching ratios of penguin-mediated decays would confirm the consistency of the deviations already observed and provide a highly valuable hint of NP in the non-leptonic sector.https://doi.org/10.1007/JHEP06(2023)108Bottom QuarksEffective Field TheoriesProperties of HadronsRare Decays |
| spellingShingle | Aritra Biswas Sébastien Descotes-Genon Joaquim Matias Gilberto Tetlalmatzi-Xolocotzi A new puzzle in non-leptonic B decays Journal of High Energy Physics Bottom Quarks Effective Field Theories Properties of Hadrons Rare Decays |
| title | A new puzzle in non-leptonic B decays |
| title_full | A new puzzle in non-leptonic B decays |
| title_fullStr | A new puzzle in non-leptonic B decays |
| title_full_unstemmed | A new puzzle in non-leptonic B decays |
| title_short | A new puzzle in non-leptonic B decays |
| title_sort | new puzzle in non leptonic b decays |
| topic | Bottom Quarks Effective Field Theories Properties of Hadrons Rare Decays |
| url | https://doi.org/10.1007/JHEP06(2023)108 |
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