Heavy quark symmetry behind b → c semileptonic sum rule

2025/01/16 by Motoi Endo, Endo, Motoi, Syuhei Iguro +5 · 3 citations
Computer Science · Physics and Astronomy · #Coding theory and cryptography #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2501.09382

openalex publication_date 2025/01/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Lepton flavor universality violations in semileptonic b → c transitions have garnered attention over a decade. For R_Hc=\rmBR(H_b→ H_c τν_τ)/\rmBR(H_b→ H_c ℓν_ℓ) with ℓ being e, μ, a sum rule among R_D, R_D^* and R_Λc 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.

Cited by

• Constructing heavy-quark sum rule for b → c meson and baryon decays
• b → c semileptonic sum rule: Current status and prospects
• b → c semileptonic sum rule: Extension to angular observables

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