Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
Abstract We perform a model-independent global fit to $$b\rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- observables to confirm existing New Physics (NP) patterns (or scenarios) and to identify new ones emerging from the inclusion of the updated LHCb and Belle measurements of $$R_K$$ RK and $$R_{K^*}$$ RK∗ ,...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-08-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-019-7216-3 |
| _version_ | 1818294210757918720 |
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| author | Marcel Algueró Bernat Capdevila Andreas Crivellin Sébastien Descotes-Genon Pere Masjuan Joaquim Matias Javier Virto |
| author_facet | Marcel Algueró Bernat Capdevila Andreas Crivellin Sébastien Descotes-Genon Pere Masjuan Joaquim Matias Javier Virto |
| author_sort | Marcel Algueró |
| collection | DOAJ |
| description | Abstract We perform a model-independent global fit to $$b\rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- observables to confirm existing New Physics (NP) patterns (or scenarios) and to identify new ones emerging from the inclusion of the updated LHCb and Belle measurements of $$R_K$$ RK and $$R_{K^*}$$ RK∗ , respectively. Our analysis, updating Refs. Capdevila et al. (J Virto JHEP 1801:093, 2018) and Algueró et al. (J Matias Phys Rev D 99(7):075017, 2019) and including these new data, suggests the presence of right-handed couplings encoded in the Wilson coefficients $${{{\mathcal {C}}}}_{9'\mu }$$ C9′μ and $${{{\mathcal {C}}}}_{10'\mu }$$ C10′μ . It also strengthens our earlier observation that a lepton flavour universality violating (LFUV) left-handed lepton coupling ($${{{\mathcal {C}}}}_{9\mu }^{\mathrm{V}}=-\,{{{\mathcal {C}}}}_{10\mu }^{\mathrm{V}}$$ C9μV=-C10μV ), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal (LFU) NP is allowed, in particular in $${{{\mathcal {C}}}}_{9}^{\mathrm{U}}$$ C9U . Furthermore, this scenario with LFU NP provides a simple and model-independent connection to the $$b\rightarrow c\tau \nu $$ b→cτν anomalies, showing a preference of $$\approx 7\,\sigma $$ ≈7σ with respect to the SM. It may also explain why fits to the whole set of $$b\rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- data or to the subset of LFUV data exhibit stronger preferences for different NP scenarios. Finally, motivated by $$Z^\prime $$ Z′ models with vector-like quarks, we propose four new scenarios with LFU and LFUV NP contributions that give a very good fit to data. |
| first_indexed | 2024-12-13T03:28:08Z |
| format | Article |
| id | doaj.art-ea620e35ce3e4c7e87093216a45c06fb |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-13T03:28:08Z |
| publishDate | 2019-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-ea620e35ce3e4c7e87093216a45c06fb2022-12-22T00:01:14ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522019-08-0179811010.1140/epjc/s10052-019-7216-3Emerging patterns of New Physics with and without Lepton Flavour Universal contributionsMarcel Algueró0Bernat Capdevila1Andreas Crivellin2Sébastien Descotes-Genon3Pere Masjuan4Joaquim Matias5Javier Virto6Grup de Física Teòrica (Departament de Física), Universitat Autònoma de BarcelonaGrup de Física Teòrica (Departament de Física), Universitat Autònoma de BarcelonaPaul Scherrer InstitutLaboratoire de Physique Théorique, UMR 8627, CNRS, Univ. Paris-Sud, Université Paris-SaclayGrup de Física Teòrica (Departament de Física), Universitat Autònoma de BarcelonaGrup de Física Teòrica (Departament de Física), Universitat Autònoma de BarcelonaPhysics Department T31, Technische Universität MünchenAbstract We perform a model-independent global fit to $$b\rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- observables to confirm existing New Physics (NP) patterns (or scenarios) and to identify new ones emerging from the inclusion of the updated LHCb and Belle measurements of $$R_K$$ RK and $$R_{K^*}$$ RK∗ , respectively. Our analysis, updating Refs. Capdevila et al. (J Virto JHEP 1801:093, 2018) and Algueró et al. (J Matias Phys Rev D 99(7):075017, 2019) and including these new data, suggests the presence of right-handed couplings encoded in the Wilson coefficients $${{{\mathcal {C}}}}_{9'\mu }$$ C9′μ and $${{{\mathcal {C}}}}_{10'\mu }$$ C10′μ . It also strengthens our earlier observation that a lepton flavour universality violating (LFUV) left-handed lepton coupling ($${{{\mathcal {C}}}}_{9\mu }^{\mathrm{V}}=-\,{{{\mathcal {C}}}}_{10\mu }^{\mathrm{V}}$$ C9μV=-C10μV ), often preferred from the model building point of view, accommodates the data better if lepton-flavour universal (LFU) NP is allowed, in particular in $${{{\mathcal {C}}}}_{9}^{\mathrm{U}}$$ C9U . Furthermore, this scenario with LFU NP provides a simple and model-independent connection to the $$b\rightarrow c\tau \nu $$ b→cτν anomalies, showing a preference of $$\approx 7\,\sigma $$ ≈7σ with respect to the SM. It may also explain why fits to the whole set of $$b\rightarrow s\ell ^+\ell ^-$$ b→sℓ+ℓ- data or to the subset of LFUV data exhibit stronger preferences for different NP scenarios. Finally, motivated by $$Z^\prime $$ Z′ models with vector-like quarks, we propose four new scenarios with LFU and LFUV NP contributions that give a very good fit to data.http://link.springer.com/article/10.1140/epjc/s10052-019-7216-3 |
| spellingShingle | Marcel Algueró Bernat Capdevila Andreas Crivellin Sébastien Descotes-Genon Pere Masjuan Joaquim Matias Javier Virto Emerging patterns of New Physics with and without Lepton Flavour Universal contributions European Physical Journal C: Particles and Fields |
| title | Emerging patterns of New Physics with and without Lepton Flavour Universal contributions |
| title_full | Emerging patterns of New Physics with and without Lepton Flavour Universal contributions |
| title_fullStr | Emerging patterns of New Physics with and without Lepton Flavour Universal contributions |
| title_full_unstemmed | Emerging patterns of New Physics with and without Lepton Flavour Universal contributions |
| title_short | Emerging patterns of New Physics with and without Lepton Flavour Universal contributions |
| title_sort | emerging patterns of new physics with and without lepton flavour universal contributions |
| url | http://link.springer.com/article/10.1140/epjc/s10052-019-7216-3 |
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