On magnitudes of some CKM matrix elements

Abstract

This writeup follows the presentation at the Symposium, with emphasis on topics and ideas discussed there. It is purposefully informal, not a review of the field, and neither does it include a complete list of references. However, I hope that readers might find some comments useful or amusing, and may appreciate the challenges and reasons for excitement about recent progress and future opportunities in flavor physics.

arXiv comment12 pages, Talk given at the KM50 Symposium, KEK, Tsukuba, February 2023 (https://www-conf.kek.jp/KM50/), published version

References in corpus (39)

• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Renormalization Group Evolution of the Standard Model Dimension Six Operators III: Gauge Coupling Dependence and Phenomenology
• FLAG Review 2021
• The Belle II Physics Book
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors
• Low-Energy Effective Field Theory below the Electroweak Scale: Operators and Matching
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Observation of Bs-Bsbar Oscillations
• On the Motion of Heavy Quarks inside Hadrons: Universal Distributions and Inclusive Decays
• Combined analysis of semileptonic $B$ decays to $D$ and $D^{\ast }$: $R(D^{(\ast )})$, $|V_{cb}|$, and new physics
• Precision Corrections to Dispersive Bounds on Form Factors
• Analysis of the Photon Spectrum in Inclusive $B\to X_s\gamma$ Decays
• Global analysis of inclusive B decays
• Precision determination of the CKM element Vcb
• The $V_{cb}$ puzzle: an update
• Model-Independent Extraction of |V_{cb}| Using Dispersion Relations
• Three loop calculations and inclusive $V_{cb}$
• Measurement of the CKM Matrix Element $|V_{cb}|$ from $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ at Belle
• Theory determination of $\bar{B}\to D^{(\ast )}{\ell }^{-}\bar{\nu }$ form factors at $\mathcal{O}(1/m_c^2)$
• Moments of semileptonic B decay distributions in the 1/m_b expansion
• B decay shape variables and the precision determination of |Vcb| and mb
• Third order corrections to the semi-leptonic \boldmath{$b\to c$} and the muon decays
• QCD Sum Rule Analysis of the Subleading Isgur-Wise Form Factor ${\chi }_2(v\cdot v^{\prime })$
• The Subleading Isgur-Wise Form Factor ${\xi }_3(v\cdot v^{\prime })$ and its Implications for the Decays $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$
• A Model Independent Determination of |V_{ub}|
• New physics in $B$ meson mixing: future sensitivity and limitations
• Moments of the photon spectrum in the inclusive $B\to X_s\gamma$ decay
• The Subleading Isgur-Wise Form Factor ${\chi }_3(v\cdot v^{\prime })$ to Order ${\alpha }_s$ in QCD Sum Rules
• Precise predictions for B -> Xs l+ l- in the large q^2 region
• Measurement of Differential Distributions of $B\to D^{\ast }\ell {\bar{\nu }}_{\ell }$ and Implications on $|V_{cb}|$
• On the relation between the $\overline{\mathrm{MS}}$ and the kinetic mass of heavy quarks
• Constrained second-order power corrections in HQET: $R(D^{(\ast )})$, $|V_{cb}|$, and new physics
• NLO QCD Corrections to Inclusive $b\to c\ell \bar{\nu }$ Decay Spectra up to $1/m_Q^3$
• Approaches to inclusive semileptonic $B_{(s)}$-meson decays from Lattice QCD
• N = 5, 6, 7, 8: Nested hypothesis tests and truncation dependence of $|V_{cb}|$
• Precision Global Determination of the $B\to X_s\gamma$ Decay Rate
• Determination of $|V_{cb}|$ using ${\overline{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with Belle II
• Measurement of Differential Branching Fractions of Inclusive $B\to X_u{\ell }^{+}{\nu }_{\ell }$ Decays