Challenges in Semileptonic B Decays

Session

Heavy to heavy inclusive

25 Sept 2024, 10:30

1. The $q^2$ moments in inclusive semileptonic $B$ decays

Gael Finauri

25/09/2024, 10:30

In this talk I will present the calculation of moments of the $q^2$ distribution in inclusive semileptonic $B$ decays with a lower cut on the dilepton invariant mass $q^2$, confirming known results. The theoretical predictions are then used in a global fit to moments of the spectrum of inclusive semileptonic $B$ decays, allowing the extraction of $|V_{cb}|$. The fit includes the recently...

3. Order-$\alpha_s^2$ corrections to the leptonic invariant mass spectrum in $B \to X_c \ell \bar \nu$.

Mateusz Czaja (University of Warsaw)

25/09/2024, 11:00

Experimental results for moments of the leptonic $q^2$-spectrum in inclusive semileptonic B-meson decays often involve cuts on $q^2$. Therefore, the spectrum itself (rather than its moments only) needs to be evaluated on the theoretical side. We present results of our calculation of $\mathcal{O}(\alpha_s^2)$ corrections to this spectrum that have been obtained via a numerical solution to...

7. Intrinsic Charm and Higher Order $1/m_b$ corrections in inclusive $B\to X_c\ell\bar{\nu}$

Ilija Sibin Milutin

25/09/2024, 11:30

The Heavy Quark Expansion (HQE) has become the major tool to perform precision calculations for inclusive rates and spectra of heavy hadron decays. With this method, the CKM matrix element $V_{cb}$ has been extracted with incredible percent-level precision from moments of the inclusive semileptonic $B\to X_c\ell\bar{\nu}$. The HQE is an expansion in powers of the inverse mass of the heavy...

12. Kolya and New results on inclusive $V_{cb}$ using $q^2$, $E_\ell$ and $M_X$ spectral moments

Keri Vos (Nikhef National institute for subatomic physics (NL))

25/09/2024, 13:30

We present a new global fit for inclusive $V_{cb}$ decays based on the Kolya open-source library, utilizing the full available set of spectral moments of semileptonic $B\to X_c \ell \nu$ decays with state-of-the-art precision. Our approach includes a novel prescription to estimate the uncertainty arising from missing higher-order contributions of order $1/m_b^4$ in the heavy quark expansion...

13. Precision QCD corrections to semileptonic $B$ decays

Matteo Fael (CERN)

25/09/2024, 14:00

In this talk, I will review recent advancements in the calculation of QCD higher-order corrections for semileptonic $B$ decays. Specifically, I will present the next-to-next-to-leading-order corrections to the $q^2$ spectrum of the inclusive decay $B \to X_c l\bar{\nu}_l$, which can be utilized to incorporate the recent measurements of $q^2$ moments by Belle and Belle II into global fits of...

10. Investigating Quark Hadron Duality Violation in inclusive semileptonic B → Xc ν l decays

Rens Verkade

25/09/2024, 14:30

The Heavy Quark Expansion (HQE) is one of the leading tools for calculating decay rates and kinematic moments of inclusive semi-leptonic B-meson decays. The HQE is an Operator Product Expansion (OPE) in terms of the inverse of the mass of the heavy bottom quark ($1/m_b$). It introduces nonperturbative HQE parameters which can be determined using data. Using the HQE, the CKM matrix element...

32. Inclusive semileptonic Bs0 meson decays via a sum-of-exclusive modes technique

Michel De Cian (Heidelberg University (DE))

25/09/2024, 16:00

37. Inclusive semileptonic decays from Lattice QCD

Ryan Kellermann (High Energy Accelerator Research Organization (KEK))

25/09/2024, 16:30

We report on the progress in the nonperturbative calculation of the decay rate for inclusive semileptonic decays of charmed and bottomed mesons. We provide an overview on the formalism used to reconstruct the inclusive rate and address the ongoing analysis into understanding the systematic errors associated with the analysis, focusing on the error due to the approximation and finite-volume...

33. Inclusive measurements in charm

Alex Gilman

25/09/2024, 17:00

41. Discussion -- Vcb inclusive, moments, fits

Christoph Schwanda (Austrian Academy of Sciences (AT)), Paolo Gambino (University of Turin)

26/09/2024, 09:00