$b \to c$ semileptonic sum rule: Extension to angular observables
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915730495111168 |
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| author | Endo, Motoi Iguro, Syuhei Kretz, Tim Mishima, Satoshi Watanabe, Ryoutaro |
| author_facet | Endo, Motoi Iguro, Syuhei Kretz, Tim Mishima, Satoshi Watanabe, Ryoutaro |
| contents | Lepton flavor universality is a key prediction of the Standard Model of particle physics and any violation of it immediately indicates the existence of new physics. Given the recent more than $4σ$ discrepancy in charged current semileptonic B meson decays and the absence of evident signals at the large hadron collider, independent cross-checks become invaluable. In this context, $b \to c$ semileptonic sum rules based on heavy quark symmetry are interesting since they allow us to check the consistency of experimental results. In this paper, we report newly found sum rules among angular observables of mesonic and baryonic $b\to c l \overlineν$ decays holding exactly in the large mass limit of heavy quarks. Moreover, we investigate corrections to the sum rule in realistic situations and discuss phenomenological implications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16027 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $b \to c$ semileptonic sum rule: Extension to angular observables Endo, Motoi Iguro, Syuhei Kretz, Tim Mishima, Satoshi Watanabe, Ryoutaro High Energy Physics - Phenomenology High Energy Physics - Experiment Lepton flavor universality is a key prediction of the Standard Model of particle physics and any violation of it immediately indicates the existence of new physics. Given the recent more than $4σ$ discrepancy in charged current semileptonic B meson decays and the absence of evident signals at the large hadron collider, independent cross-checks become invaluable. In this context, $b \to c$ semileptonic sum rules based on heavy quark symmetry are interesting since they allow us to check the consistency of experimental results. In this paper, we report newly found sum rules among angular observables of mesonic and baryonic $b\to c l \overlineν$ decays holding exactly in the large mass limit of heavy quarks. Moreover, we investigate corrections to the sum rule in realistic situations and discuss phenomenological implications. |
| title | $b \to c$ semileptonic sum rule: Extension to angular observables |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2506.16027 |