Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data
In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Springer Berlin Heidelberg
2018
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| Online Access: | http://hdl.handle.net/1721.1/116610 |
| _version_ | 1826196062204854272 |
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| author | Capdevila, Bernat Crivellin, Andreas Descotes-Genon, Sébastien Matias, Joaquim Virto, Javier |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Capdevila, Bernat Crivellin, Andreas Descotes-Genon, Sébastien Matias, Joaquim Virto, Javier |
| author_sort | Capdevila, Bernat |
| collection | MIT |
| description | In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and electron modes. The LHCb collaboration discovered a set of deviations from the SM expectations in decays to muons and also in ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. We perform a global fit to all available b → sℓ+ℓ− data (ℓ = e, μ) in a model-independent way allowing for different patterns of New Physics. For the first time, the NP hypothesis is preferred over the SM by 5 σ in a general case when NP can enter SM-like operators and their chirally-flipped partners. LFU violation is favoured with respect to LFU at the 3-4 σ level. We discuss the impact of LFU-violating New Physics on the observable P5 from B → K∗μ+μ− and we compare our estimate for long-distance charm contributions with an empirical model recently proposed by a group of LHCb experimentalists. Finally, we discuss NP models able to describe this consistent pattern of deviations. |
| first_indexed | 2024-09-23T10:20:15Z |
| format | Article |
| id | mit-1721.1/116610 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:20:15Z |
| publishDate | 2018 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1166102022-09-30T20:30:23Z Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data Capdevila, Bernat Crivellin, Andreas Descotes-Genon, Sébastien Matias, Joaquim Virto, Javier Massachusetts Institute of Technology. Department of Physics Virto, Javier In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and electron modes. The LHCb collaboration discovered a set of deviations from the SM expectations in decays to muons and also in ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. We perform a global fit to all available b → sℓ+ℓ− data (ℓ = e, μ) in a model-independent way allowing for different patterns of New Physics. For the first time, the NP hypothesis is preferred over the SM by 5 σ in a general case when NP can enter SM-like operators and their chirally-flipped partners. LFU violation is favoured with respect to LFU at the 3-4 σ level. We discuss the impact of LFU-violating New Physics on the observable P5 from B → K∗μ+μ− and we compare our estimate for long-distance charm contributions with an empirical model recently proposed by a group of LHCb experimentalists. Finally, we discuss NP models able to describe this consistent pattern of deviations. grant FPA2014-61478-EXP Centro de Excelencia Severo Ochoa (SEV-2012-023) European Union. HORIZON 2020 (grants No 690575) European Union. HORIZON 2020 (grants No 674896) European Union. HORIZON 2020 (grants No 692194) Swiss National Science Foundation (Ambizione Grant PZ00P2 154834) Swiss National Science Foundation 2018-06-26T14:21:18Z 2018-06-26T14:21:18Z 2018-01 2017-12 2018-06-22T03:55:55Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/116610 Capdevila, Bernat, Andreas Crivellin, Sébastien Descotes-Genon, Joaquim Matias and Javier Virto. "Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data." Journal of High Energy Physics, January 2018, 2018:93. en https://doi.org/10.1007/JHEP01(2018)093 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Capdevila, Bernat Crivellin, Andreas Descotes-Genon, Sébastien Matias, Joaquim Virto, Javier Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title | Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title_full | Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title_fullStr | Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title_full_unstemmed | Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title_short | Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data |
| title_sort | patterns of new physics in b sl l transitions in the light of recent data |
| url | http://hdl.handle.net/1721.1/116610 |
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