Heavy quark symmetry behind b → c semileptonic sum rule
A bstract Lepton flavor universality violations in semileptonic b → c transitions have garnered attention over a decade. For $${R}_{{H}_{c}}={\text{BR}}\left({H}_{b}\to {H}_{c}\tau {\overline{\nu }}_{\tau }\right)/{\text{BR}}\left({H}_{b}\to {H}_{c}{\ell}{\overline{\nu }}_{{\ell}}\right)$$ with ℓ being e, μ , a sum rule among R D , $${R}_{{D}^{*}}$$ and R Λ c was proposed to check consistency in the experimental results independently of new physics models. We revisit this relation from the perspective of the heavy quark symmetry. We derive a sum rule holding exactly in the heavy quark limit and clarify how model-dependent corrections are introduced in a realistic situation.
Authors
- Motoi Endo (ORCID: https://orcid.org/0000-0002-8392-780X)
- Syuhei Iguro (ORCID: https://orcid.org/0000-0002-8295-9623)
- Satoshi Mishima (ORCID: https://orcid.org/0000-0003-1832-1825)
- Ryoutaro Watanabe (ORCID: https://orcid.org/0000-0001-9317-5843)
Institutions
- High Energy Accelerator Research Organization (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Central China Normal University (CN)
- EarthTech International (United States) (US)
- Nagoya University (JP)
- Saitama Medical University (JP)
Publication Details
- Journal
- Journal of High Energy Physics
- Published
- 2025-05-14
- DOI
- https://doi.org/10.1007/jhep05(2025)112
- Citations
- 6
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 11.22
Funders
- Japan Society for the Promotion of Science