b → sτ + τ − physics at future Z factories
Abstract b → sτ + τ − measurements are highly motivated for addressing lepton-flavor-universality (LFU)-violating puzzles such as R K ∗ $$ {R}_{K^{\left(\ast \right)}} $$ anomalies. The anomalies of R D ∗ $$ {R}_{D^{\left(\ast \right)}} $$ and R J/ψ further strengthen their necessity and importance,...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-06-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2021)064 |
| _version_ | 1818436162155446272 |
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| author | Lingfeng Li Tao Liu |
| author_facet | Lingfeng Li Tao Liu |
| author_sort | Lingfeng Li |
| collection | DOAJ |
| description | Abstract b → sτ + τ − measurements are highly motivated for addressing lepton-flavor-universality (LFU)-violating puzzles such as R K ∗ $$ {R}_{K^{\left(\ast \right)}} $$ anomalies. The anomalies of R D ∗ $$ {R}_{D^{\left(\ast \right)}} $$ and R J/ψ further strengthen their necessity and importance, given that the LFU-violating hints from both involve the third-generation leptons directly. Z factories at the future e − e + colliders stand at a great position to conduct such measurements because of their relatively high production rates and reconstruction efficiencies for B mesons at the Z pole. To fully explore this potential, we pursue a dedicated sensitivity study in four b → sτ + τ − benchmark channels, namely B 0 → K *0 τ + τ − , B s → ϕτ + τ − , B + → K + τ + τ − and B s → τ + τ − , at the future Z factories. We develop a fully tracker-based scheme for reconstructing the signal B mesons and introduce a semi-quantitative method for estimating their major backgrounds. The simulations indicate that branching ratios of the first three channels can be measured with a precision ∼ O $$ \mathcal{O} $$ (10 −7 − 10 −6) and that of B s → τ + τ − with a precision ∼ O $$ \mathcal{O} $$ (10 −5) at Tera-Z. The impacts of luminosity and tracker resolution on the expected sensitivities are explored. The interpretations of these results in effective field theory are also presented. |
| first_indexed | 2024-12-14T17:04:23Z |
| format | Article |
| id | doaj.art-e104242aaa624d859e2c508c4aa071e7 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-14T17:04:23Z |
| publishDate | 2021-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-e104242aaa624d859e2c508c4aa071e72022-12-21T22:53:46ZengSpringerOpenJournal of High Energy Physics1029-84792021-06-012021613110.1007/JHEP06(2021)064b → sτ + τ − physics at future Z factoriesLingfeng Li0Tao Liu1Jockey Club Institute for Advanced Study, The Hong Kong University of Science and TechnologyDepartment of Physics, The Hong Kong University of Science and TechnologyAbstract b → sτ + τ − measurements are highly motivated for addressing lepton-flavor-universality (LFU)-violating puzzles such as R K ∗ $$ {R}_{K^{\left(\ast \right)}} $$ anomalies. The anomalies of R D ∗ $$ {R}_{D^{\left(\ast \right)}} $$ and R J/ψ further strengthen their necessity and importance, given that the LFU-violating hints from both involve the third-generation leptons directly. Z factories at the future e − e + colliders stand at a great position to conduct such measurements because of their relatively high production rates and reconstruction efficiencies for B mesons at the Z pole. To fully explore this potential, we pursue a dedicated sensitivity study in four b → sτ + τ − benchmark channels, namely B 0 → K *0 τ + τ − , B s → ϕτ + τ − , B + → K + τ + τ − and B s → τ + τ − , at the future Z factories. We develop a fully tracker-based scheme for reconstructing the signal B mesons and introduce a semi-quantitative method for estimating their major backgrounds. The simulations indicate that branching ratios of the first three channels can be measured with a precision ∼ O $$ \mathcal{O} $$ (10 −7 − 10 −6) and that of B s → τ + τ − with a precision ∼ O $$ \mathcal{O} $$ (10 −5) at Tera-Z. The impacts of luminosity and tracker resolution on the expected sensitivities are explored. The interpretations of these results in effective field theory are also presented.https://doi.org/10.1007/JHEP06(2021)064Beyond Standard ModelHeavy Quark Physics |
| spellingShingle | Lingfeng Li Tao Liu b → sτ + τ − physics at future Z factories Journal of High Energy Physics Beyond Standard Model Heavy Quark Physics |
| title | b → sτ + τ − physics at future Z factories |
| title_full | b → sτ + τ − physics at future Z factories |
| title_fullStr | b → sτ + τ − physics at future Z factories |
| title_full_unstemmed | b → sτ + τ − physics at future Z factories |
| title_short | b → sτ + τ − physics at future Z factories |
| title_sort | b sτ τ physics at future z factories |
| topic | Beyond Standard Model Heavy Quark Physics |
| url | https://doi.org/10.1007/JHEP06(2021)064 |
| work_keys_str_mv | AT lingfengli bsttphysicsatfuturezfactories AT taoliu bsttphysicsatfuturezfactories |