Constraints on new physics couplings from ${\bar B} \to D^*\,(D\,π)\,\ell\,{\bar ν}_{\ell}$ angular analysis
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917810564759552 |
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| author | Losacco, Nicola |
| author_facet | Losacco, Nicola |
| contents | The Belle Collaboration has measured the complete set of angular coefficient functions for the decays ${\bar B} \to D^*\,(D\,π)\,\ell\,{\bar ν}_{\ell}$, where $\ell = e,\,μ$, in four bins of the variable $w={m_B^2+m_{D^*}^2-q^2 \over 2\, m_B\, m_{D^*}}$, with $q$ the momentum of the lepton pair. In SM this measurement is instrumental in determining the hadronic form factors in the $B \to D^*$ matrix elements of the SM weak current, thereby refining the measurement of $\lvert V_{cb} \lvert$. On the other hand, it can be used to assess the impact of possible new physics contributions. I consider an extension of the SM effective Hamiltonian that governs this mode, incorporating the complete set of Lorentz invariant $d = 6$ operators compatible with the gauge symmetry of the theory. The measured angular coefficient functions play a pivotal role in constraining the couplings in the generalized effective Hamiltonian. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16045 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraints on new physics couplings from ${\bar B} \to D^*\,(D\,π)\,\ell\,{\bar ν}_{\ell}$ angular analysis Losacco, Nicola High Energy Physics - Phenomenology The Belle Collaboration has measured the complete set of angular coefficient functions for the decays ${\bar B} \to D^*\,(D\,π)\,\ell\,{\bar ν}_{\ell}$, where $\ell = e,\,μ$, in four bins of the variable $w={m_B^2+m_{D^*}^2-q^2 \over 2\, m_B\, m_{D^*}}$, with $q$ the momentum of the lepton pair. In SM this measurement is instrumental in determining the hadronic form factors in the $B \to D^*$ matrix elements of the SM weak current, thereby refining the measurement of $\lvert V_{cb} \lvert$. On the other hand, it can be used to assess the impact of possible new physics contributions. I consider an extension of the SM effective Hamiltonian that governs this mode, incorporating the complete set of Lorentz invariant $d = 6$ operators compatible with the gauge symmetry of the theory. The measured angular coefficient functions play a pivotal role in constraining the couplings in the generalized effective Hamiltonian. |
| title | Constraints on new physics couplings from ${\bar B} \to D^*\,(D\,π)\,\ell\,{\bar ν}_{\ell}$ angular analysis |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.16045 |