Ryoutaro Watanabe

$|V_{cb}|$ determinations from $\bar{B} \to D^{(*)} \ell \barν$ decays within the SM and beyond

Wensheng Fang, Syuhei Iguro, Xin-Qiang Li, Ria Sain et autres

We investigate the $|V_{cb}|$ determinations from exclusive semi-leptonic $\bar{B} \to D^{(*)}\ell\barν$ decays, together with comprehensive fit analyses of the $\bar{B} \to D^{(*)}$ transition form-factors, by taking into account recent updates of experimental distribution data and theoretical evaluations. Several commonly adopted form-factor parameterizations, …

$|V_{cb}|$ determinations from $\bar{B} \to D^{(*)} \ell \barν$ decays within the SM and beyond

Wensheng Fang, Syuhei Iguro, Xin-Qiang Li, Ria Sain et autres

We investigate the $|V_{cb}|$ determinations from exclusive semi-leptonic $\bar{B} \to D^{(*)}\ell\barν$ decays, together with comprehensive fit analyses of the $\bar{B} \to D^{(*)}$ transition form-factors, by taking into account recent updates of experimental distribution data and theoretical evaluations. Several commonly adopted form-factor parameterizations, …

cn, ca, jp (code pays fourni par la source)

Semileptonic sum rules in heavy-to-light charm decays

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Takeru Uchiyama et autres

We investigate semileptonic sum rules in heavy-to-light charm decays, motivated by analogous relations in $b \to c$ and $b \to u$ transitions. Focusing on the $c \to d\overline{\ell}ν$ decays, $D \to π\overline{\ell}ν$, $D \to ρ\overline{\ell}ν$, and $Λ_c \to n\overline{\ell}ν$, we examine a …

Semileptonic sum rules in heavy-to-light charm decays

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Takeru Uchiyama et autres

We investigate semileptonic sum rules in heavy-to-light charm decays, motivated by analogous relations in $b \to c$ and $b \to u$ transitions. Focusing on the $c \to d\overline{\ell}ν$ decays, $D \to π\overline{\ell}ν$, $D \to ρ\overline{\ell}ν$, and $Λ_c \to n\overline{\ell}ν$, we examine a …

jp, cn, ca (code pays fourni par la source)

b → c semileptonic sum rule: current status and prospects

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

A bstract The b → c semileptonic sum rules provide relations between the decay rates of $$B\to {D}^{(*)}\tau \overline{\nu }$$ and $${\Lambda }_{b}\to {\Lambda }_{c}\tau \overline{\nu }$$ . Starting from the heavy quark and zero-recoil limits, we revisit the derivation of the …

jp, cn (code pays fourni par la source)

Publisher Erratum: $$b \rightarrow c$$ semileptonic sum rule: extension to angular observables

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

jp, de, cn (code pays fourni par la source)

$$b \rightarrow c$$ semileptonic sum rule: extension to angular observables

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

Abstract 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 discrepancy of more than $$4\sigma $$ 4 σ in charged current semileptonic …

jp, de, cn (code pays fourni par la source)

Constructing heavy-quark sum rule for $b \to c$ meson and baryon decays

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

We study heavy-hadron semileptonic decays proceeding via $b \to c$ transition, such as $B \to D^{(*)}τ\barν_τ$ and $Λ_b \to Λ_cτ\barν_τ$. In the heavy-quark limit, where the heavy-quark symmetry holds, we provide a fundamental framework for heavy-quark sum rules among these decays based …

$b \to c$ semileptonic sum rule: Current status and prospects

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

The $b \to c$ semileptonic sum rules provide relations between the decay rates of $B \to D^{(*)} τ\barν$ and $Λ_b \to Λ_c τ\barν$. Starting from the heavy quark and zero-recoil limits, we revisit the derivation of the sum rule for total decay …

On sum rules for semi-leptonic b → c and b → u decays

Wen-Feng Duan, Syuhei Iguro, Xin-Qiang Li, Ryoutaro Watanabe et autres

A bstract The semi-leptonic b → clν processes are receiving a lot of attention, as the lepton flavor universality (LFU) violation has been hinted by the measured ratios $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ = Γ( B → D (∗) τν …

cn, jp (code pays fourni par la source)

Heavy quark symmetry behind b → c semileptonic sum rule

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

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 …

jp, us, cn (code pays fourni par la source)

Heavy quark symmetry behind $b \to c$ semileptonic sum rule

Motoi Endo, Syuhei Iguro, Satoshi Mishima, Ryoutaro Watanabe

Lepton flavor universality violations in semileptonic $b \to c$ transitions have garnered attention over a decade. For $R_{H_c}={\rm{BR}}(H_b\to H_c τ\barν_τ)/{\rm{BR}}(H_b\to H_c \ell\barν_\ell)$ with $\ell$ being $e,\, μ$, a sum rule among $R_{D}$, $R_{D^*}$ and $R_{Λ_c}$ was proposed to check consistency in the …