Year: 2025
Type: article
Abstract: 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.
Source: Journal of High Energy Physics
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G178350283, Explore quark and lepton flavor structure via light new particles, Exploring frontier of particle physics with precise prediction of flavor physics, G6068080060, New developments in grand unified theory through flavor physics, Exploration of the particle physics frontier at the Super B-factory and cultivation o f young researchers
OpenAlex ID: W4410410582