Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints
Abstract Besides being important to determine Standard Model parameters such as the CKM matrix elements |V cb | and |V ub |, semileptonic B decays seem also promising to reveal new physics (NP) phenomena, in particular in connection with the possibility of uncovering lepton flavour universality (LFU...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-06-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP06(2018)082 |
| _version_ | 1831771292757393408 |
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| author | P. Colangelo F. De Fazio |
| author_facet | P. Colangelo F. De Fazio |
| author_sort | P. Colangelo |
| collection | DOAJ |
| description | Abstract Besides being important to determine Standard Model parameters such as the CKM matrix elements |V cb | and |V ub |, semileptonic B decays seem also promising to reveal new physics (NP) phenomena, in particular in connection with the possibility of uncovering lepton flavour universality (LFU) violating effects. In this view, it could be natural to connect the tensions in the inclusive versus exclusive determinations of |V cb | to the anomalies in the ratios R(D (*)) of decay rates into τ vs μ, e. However, the question has been raised about the role of the parametrization of the hadronic B → D (*) form factors in exclusive B decay modes. We focus on the fully differential angular distributions of B¯→D∗ℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast }{\ell}^{-}{\overline{\nu}}_{\ell } $$ with D ∗ → Dπ or D ∗ → Dγ, the latter mode being important in the case of B s → D s * decays. We show that the angular coefficients in the distributions can be used to scrutinize the role of the form factor parametrization and to pin down deviations from SM. As an example of a NP scenario, we include a tensor operator in the b → c semileptonic effective Hamiltonian, and discuss how the angular coefficients allow to construct observables sensitive to this structure, also defining ratios useful to test LFU. |
| first_indexed | 2024-12-22T07:56:42Z |
| format | Article |
| id | doaj.art-5f02ed13b95a4b68a526ca1b7f0f4648 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-22T07:56:42Z |
| publishDate | 2018-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-5f02ed13b95a4b68a526ca1b7f0f46482022-12-21T18:33:21ZengSpringerOpenJournal of High Energy Physics1029-84792018-06-012018613310.1007/JHEP06(2018)082Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprintsP. Colangelo0F. De Fazio1Istituto Nazionale di Fisica Nucleare, Sezione di BariIstituto Nazionale di Fisica Nucleare, Sezione di BariAbstract Besides being important to determine Standard Model parameters such as the CKM matrix elements |V cb | and |V ub |, semileptonic B decays seem also promising to reveal new physics (NP) phenomena, in particular in connection with the possibility of uncovering lepton flavour universality (LFU) violating effects. In this view, it could be natural to connect the tensions in the inclusive versus exclusive determinations of |V cb | to the anomalies in the ratios R(D (*)) of decay rates into τ vs μ, e. However, the question has been raised about the role of the parametrization of the hadronic B → D (*) form factors in exclusive B decay modes. We focus on the fully differential angular distributions of B¯→D∗ℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast }{\ell}^{-}{\overline{\nu}}_{\ell } $$ with D ∗ → Dπ or D ∗ → Dγ, the latter mode being important in the case of B s → D s * decays. We show that the angular coefficients in the distributions can be used to scrutinize the role of the form factor parametrization and to pin down deviations from SM. As an example of a NP scenario, we include a tensor operator in the b → c semileptonic effective Hamiltonian, and discuss how the angular coefficients allow to construct observables sensitive to this structure, also defining ratios useful to test LFU.http://link.springer.com/article/10.1007/JHEP06(2018)082Heavy Quark PhysicsQuark Masses and SM ParametersBeyond Standard Model |
| spellingShingle | P. Colangelo F. De Fazio Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints Journal of High Energy Physics Heavy Quark Physics Quark Masses and SM Parameters Beyond Standard Model |
| title | Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints |
| title_full | Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints |
| title_fullStr | Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints |
| title_full_unstemmed | Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints |
| title_short | Scrutinizing B¯→D∗Dπℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\pi \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ and B¯→D∗Dγℓ−ν¯ℓ $$ \overline{B}\to {D}^{\ast}\left(D\upgamma \right){\ell}^{-}{\overline{\nu}}_{\ell } $$ in search of new physics footprints |
| title_sort | scrutinizing b¯ d∗dπl ν¯l overline b to d ast left d pi right ell overline nu ell and b¯ d∗dγl ν¯l overline b to d ast left d upgamma right ell overline nu ell in search of new physics footprints |
| topic | Heavy Quark Physics Quark Masses and SM Parameters Beyond Standard Model |
| url | http://link.springer.com/article/10.1007/JHEP06(2018)082 |
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