5–7 Mar 2025 Conference
Nagoya University
Asia/Tokyo timezone

Heavy quark symmetry behind b → c semileptonic sum rule

5 Mar 2025, 18:15
1h 45m
Sakata and Hirata Hall (Nagoya University)

Sakata and Hirata Hall

Nagoya University

Science South bulding, Furo-cho, Chikusa, Nagoya, Aichi, 464-8602, Japan

Speaker

Syuhei Iguro (KEK/IAR/KMI)

Description

Lepton flavor universality violations in semileptonic b→c transitions have garnered attention over a decade. For RH_c=BR(H_b→H_cτν)/BR(H_b→H_cℓν) with ℓ being e, μ, a sum rule among RD, RD∗ and RΛc 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.

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