Testing the W -exchange mechanism with two-body baryonic B decays
Abstract The role of W -exchange diagrams in baryonic B decays is poorly understood, and often taken as insignificant and neglected. We show that charmful two-body baryonic B → B c B ¯ ′ $$ B\to {\mathbf{B}}_c\overline{\mathbf{B}}^{\prime } $$ decays provide a good test-bed for the study of the W -e...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP04(2020)035 |
| _version_ | 1818061649242750976 |
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| author | Y.K. Hsiao Shang-Yuu Tsai Chong-Chung Lih Eduardo Rodrigues |
| author_facet | Y.K. Hsiao Shang-Yuu Tsai Chong-Chung Lih Eduardo Rodrigues |
| author_sort | Y.K. Hsiao |
| collection | DOAJ |
| description | Abstract The role of W -exchange diagrams in baryonic B decays is poorly understood, and often taken as insignificant and neglected. We show that charmful two-body baryonic B → B c B ¯ ′ $$ B\to {\mathbf{B}}_c\overline{\mathbf{B}}^{\prime } $$ decays provide a good test-bed for the study of the W -exchange topology, whose contribution is found to be non-negligible; here B c is an anti-triplet or a sextet charmed baryon, and B ¯ ′ $$ \overline{\mathbf{B}}^{\prime } $$ an octet charmless (anti-)baryon. In particular, we calculate that ℬ B ¯ 0 → Σ c + p ¯ = 2.9 − 0.9 + 0.8 × 10 − 6 $$ \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {\Sigma}_c^{+}\overline{p}\right)=\left({2.9}_{-0.9}^{+0.8}\right)\times {10}^{-6} $$ in good agreement with the experimental upper bound. Its cousin B ¯ s 0 $$ {\overline{B}}_s^0 $$ mode, B ¯ s 0 → Λ c + p ¯ $$ {\overline{B}}_s^0\to {\Lambda}_c^{+}\overline{p} $$ , is a purely W -exchange decay, hence is naturally suited for the study of the role of the W -exchange topology. We predict ℬ B ¯ s 0 → Λ c + p ¯ = 0.8 ± 0.3 × 10 − 6 $$ \mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\Lambda}_c^{+}\overline{p}\right)=\left(0.8\pm 0.3\right)\times {10}^{-6} $$ , a relatively large branching ratio to be tested with a future measurement by the LHCb collaboration. Other predictions, such as ℬ B ¯ 0 → Ξ c + Σ ¯ − = 1.1 ± 0.4 × 10 − 5 $$ \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {\Xi}_c^{+}{\overline{\Sigma}}^{-}\right)=\left(1.1\pm 0.4\right)\times {10}^{-5} $$ , can be tested with future Belle II measurements. |
| first_indexed | 2024-12-10T13:51:40Z |
| format | Article |
| id | doaj.art-172ca6dd1b5e4b51bed789615287747e |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-10T13:51:40Z |
| publishDate | 2020-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-172ca6dd1b5e4b51bed789615287747e2022-12-22T01:46:09ZengSpringerOpenJournal of High Energy Physics1029-84792020-04-012020411110.1007/JHEP04(2020)035Testing the W -exchange mechanism with two-body baryonic B decaysY.K. Hsiao0Shang-Yuu Tsai1Chong-Chung Lih2Eduardo Rodrigues3School of Physics and Information Engineering, Shanxi Normal UniversitySchool of Physics and Information Engineering, Shanxi Normal UniversityDepartment of Optometry, Central Taiwan University of Science and TechnologyOliver Lodge Laboratory, University of LiverpoolAbstract The role of W -exchange diagrams in baryonic B decays is poorly understood, and often taken as insignificant and neglected. We show that charmful two-body baryonic B → B c B ¯ ′ $$ B\to {\mathbf{B}}_c\overline{\mathbf{B}}^{\prime } $$ decays provide a good test-bed for the study of the W -exchange topology, whose contribution is found to be non-negligible; here B c is an anti-triplet or a sextet charmed baryon, and B ¯ ′ $$ \overline{\mathbf{B}}^{\prime } $$ an octet charmless (anti-)baryon. In particular, we calculate that ℬ B ¯ 0 → Σ c + p ¯ = 2.9 − 0.9 + 0.8 × 10 − 6 $$ \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {\Sigma}_c^{+}\overline{p}\right)=\left({2.9}_{-0.9}^{+0.8}\right)\times {10}^{-6} $$ in good agreement with the experimental upper bound. Its cousin B ¯ s 0 $$ {\overline{B}}_s^0 $$ mode, B ¯ s 0 → Λ c + p ¯ $$ {\overline{B}}_s^0\to {\Lambda}_c^{+}\overline{p} $$ , is a purely W -exchange decay, hence is naturally suited for the study of the role of the W -exchange topology. We predict ℬ B ¯ s 0 → Λ c + p ¯ = 0.8 ± 0.3 × 10 − 6 $$ \mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\Lambda}_c^{+}\overline{p}\right)=\left(0.8\pm 0.3\right)\times {10}^{-6} $$ , a relatively large branching ratio to be tested with a future measurement by the LHCb collaboration. Other predictions, such as ℬ B ¯ 0 → Ξ c + Σ ¯ − = 1.1 ± 0.4 × 10 − 5 $$ \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {\Xi}_c^{+}{\overline{\Sigma}}^{-}\right)=\left(1.1\pm 0.4\right)\times {10}^{-5} $$ , can be tested with future Belle II measurements.http://link.springer.com/article/10.1007/JHEP04(2020)035B physicsBranching fractionFlavor physicsRare decayHadron-Hadron scattering (experiments) |
| spellingShingle | Y.K. Hsiao Shang-Yuu Tsai Chong-Chung Lih Eduardo Rodrigues Testing the W -exchange mechanism with two-body baryonic B decays Journal of High Energy Physics B physics Branching fraction Flavor physics Rare decay Hadron-Hadron scattering (experiments) |
| title | Testing the W -exchange mechanism with two-body baryonic B decays |
| title_full | Testing the W -exchange mechanism with two-body baryonic B decays |
| title_fullStr | Testing the W -exchange mechanism with two-body baryonic B decays |
| title_full_unstemmed | Testing the W -exchange mechanism with two-body baryonic B decays |
| title_short | Testing the W -exchange mechanism with two-body baryonic B decays |
| title_sort | testing the w exchange mechanism with two body baryonic b decays |
| topic | B physics Branching fraction Flavor physics Rare decay Hadron-Hadron scattering (experiments) |
| url | http://link.springer.com/article/10.1007/JHEP04(2020)035 |
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