Challenges in Semileptonic B Decays

Abstract

Two of the elements of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, $|V_{ub}|$ and $|V_{cb}|$, are extracted from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, remain puzzling, because for both $|V_{ub}|$ and $|V_{cb}|$ the exclusive and inclusive determinations are in clear tension. Further, measurements in the $\tau$ channels at Belle, Babar, and LHCb show discrepancies with the Standard Model predictions, pointing to a possible violation of lepton flavor universality. LHCb and Belle II have the potential to resolve these issues in the next few years. This article summarizes the discussions and results obtained at the MITP workshop held on April 9--13, 2018, in Mainz, Germany, with the goal to develop a medium-term strategy of analyses and calculations aimed at solving the puzzles. Lattice and continuum theorists working together with experimentalists have discussed how to reshape the semileptonic analyses in view of the much higher luminosity expected at Belle II, searching for ways to systematically validate the theoretical predictions in both exclusive and inclusive B decays, and to exploit the rich possibilities at LHCb.

arXiv comment77 pages

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• B-meson charged current anomalies: the post-Moriond status
• Semileptonic $B_{(s)}$ decays to excited charmed mesons with $e,\mu ,\tau$ and searching for new physics with $R(D^{\ast \ast })$
• Looking for possible new physics in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ in light of recent data
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• Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|
• Inclusive Measure of |V_ub| with the Analytic Coupling Model
• |V_cd| from D Meson Leptonic Decays
• B-meson decay constants from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
• Perturbative corrections to power suppressed effects in semileptonic B decays
• The $\pi \gamma \to \pi \pi$ transition and the $\rho$ radiative decay width from lattice QCD
• Enhanced subleading structure functions in semileptonic B decay
• Moments of the electron energy spectrum and partial branching fraction of $B\to X_{c}e\nu$ decays at Belle
• B-> D* zero-recoil formfactor and the heavy quark expansion in QCD: a systematic study
• Kinetic corrections to B -> X_c l nu at one loop
• Lattice QCD form factor for $B_s\to D_s^{\ast }l\nu$ at zero recoil with non-perturbative current renormalisation
• $B_s\to K\ell \nu$ decay from lattice QCD
• B semileptonic moments at NNLO
• Tensions and correlations in $|V_{cb}|$ determinations
• Extraction of HQE parameters from unquenched lattice data on pseudoscalar and vector heavy-light meson masses
• Right-handed Neutrinos and $R(D^{(\ast )})$
• Light-cone distribution functions for B decays at subleading order in 1/mb
• Enhanced Non-local Power Corrections to the B->X_s+gamma Decay Rate
• Extraction of form Factors from a Four-Dimensional Angular Analysis of $\overline{B}\to D^{\ast }{\ell }^{-}{\overline{\nu }}_{\ell }$
• Measurement of the Moments of the Hadronic Invariant Mass Distribution in Semileptonic B Decays
• Measurement of the shape of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\mu }^{-}\overline{\nu }$ differential decay rate
• Improving Extractions of |Vcb| and mb from the Hadronic Invariant Mass Moments of Semileptonic Inclusive B decay
• Subleading shape functions in B -> X_u l νand the determination of |Vub|
• Hilbert Series and Operator Basis for NRQED and NRQCD/HQET
• NNLO corrections to B --> X_u l nu in the shape-function region
• 'Bs --> Ds l nu' near zero recoil in and beyond the Standard Model
• The Subleading Isgur-Wise Form Factor ${\chi }_3(v\cdot v^{\prime })$ to Order ${\alpha }_s$ in QCD Sum Rules
• Moments of the B Meson Inclusive Semileptonic Decay Rate using Neutrino Reconstruction
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Form factors in $B\to \pi \pi \ell {\bar{\nu }}_{\ell }$ from QCD light-cone sum rules
• Bottom and Charm Mass determinations from global fits to $Q\bar{Q}$ bound states at N${}^3$LO
• Kinetic operator effects in B-> X_c l nu at O(alpha_s)
• Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination of |V_ub|
• Determination of quark masses from ${\mathbf{n}}_{\mathbf{f}}=4$ lattice QCD and the RI-SMOM intermediate scheme
• Measurement Of |V_ub| From Inclusive Charmless Semileptonic B Decays
• $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ and neutrino mass in the 2HDM-III with right-handed neutrinos
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• Strong coupling constant and heavy quark masses in 2+1 flavor QCD
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• Search for the rare decay of $B^{+}\to {\ell }^{+}{\nu }_{\ell }\gamma$ with improved hadronic tagging
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• $B\to \pi \ell \nu$ at zero recoil from lattice QCD with physical $u/d$ quarks
• Timelike-helicity $B\to \pi \pi$ form factor from light-cone sum rules with dipion distribution amplitudes
• B to rho ell nu form factors in lattice QCD
• Bottom Quark Mass from ${\rm Y}$ Sum Rules to $\mathcal{O}({\alpha }_s^3)$
• On the $O({\alpha }_s^2)$ corrections to $b\to X_{u}e\bar{\nu }$ inclusive decays
• Addendum to arXiv:0907.2110: "Charm and Bottom Quark Masses: An Update"
• Search for $B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau }$ with hadronic tagging at Belle
• ${\rm Y}$ and $\psi$ leptonic decays as probes of solutions to the $R_D^{(\ast )}$ puzzle
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• Improved Estimates for the Parameters of the Heavy Quark Expansion
• The B -> pi tau nu decay in the context of the 2HDM type II
• Measurement of absolute branching fractions of inclusive semileptonic decays of charm and charmed-strange mesons
• The mass of the b-quark from lattice NRQCD and lattice perturbation theory
• Subleading Jet Functions in Inclusive B Decays
• Determinations of |Vub| from Inclusive Semileptonic B Decays with Reduced Model Dependence
• Measurement of $B_s^0$ and $D_s^{-}$ meson lifetimes
• Measurement of the inclusive electron spectrum from B meson decays and determination of |Vub|
• Testing lepton flavour universality in semileptonic ${\Lambda }_b\to {\Lambda }_c^{\ast }$ decays
• On HQET and NRQCD Operators of Dimension 8 and Above
• Reconstruction of semileptonically decaying beauty hadrons produced in high energy pp collisions
• Three-loop soft function for heavy-to-light quark decays
• Inclusive semi-leptonic B meson decay structure functions from lattice QCD
• Determination of the renormalized heavy-quark mass in Lattice QCD
• Constraining weak annihilation using semileptonic D decays
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• Strong coupling constant and quark masses from lattice QCD
• Experimental Limits on Weak Annihilation Contributions to b -->u ell nu Decay
• Mass of the bottom quark from Upsilon(1S) at NNNLO: an update
• Search for the rare decay $B^{+}\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\nu }_{\mu }$
• Form factor ratios for $B_s\to K\ell \nu$ and $B_s\to D_s\ell \nu$ semileptonic decays and $|V_{ub}/V_{cb}|$
• Charged Higgs boson contribution to $B_q^{-}\to \ell \bar{\nu }$ and $\bar{B}\to (P,V)\ell \bar{\nu }$ in a generic two-Higgs doublet model
• Perturbative corrections to the determination of Vub from the P+ spectrum in B->X_u l nu
• Running-coupling effects in the triple-differential charmless semileptonic decay width
• NNLO corrections to B --> X_u l nu and the determination of |V_ub|
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• Dispersive bounds for local form factors in ${\Lambda }_b\to \Lambda$ transitions
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• Role of $B_c^{+}\to B_{s,d}^{(\ast )}\bar{\ell }{\nu }_{\ell }$ in the Standard Model and in the search for BSM signals
• Padé approximants to $B\to \pi \ell {\nu }_{\ell }$ and $B_s\to K\ell {\nu }_{\ell }$ and determination of $|V_{ub}|$
• Identifying regions in wide-angle scattering via graph-theoretical approaches
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• Perturbative corrections to power suppressed effects in $\bar{B}\to X_u\ell \nu$
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• Relations among $B_c\to J/\psi ,{\eta }_c$ form factors
• $B\to \rho \ell \bar{\nu }$ resonance form factors from $B\to \pi \pi \ell \bar{\nu }$ in lattice QCD
• Implications for the $\Delta A_{FB}$ anomaly in ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}\bar{\nu }$ using a new Monte Carlo Event Generator
• A Light shed on Lepton Flavor Universality in B decays
• New physics contributions to moments of inclusive $b\to c$ semileptonic decays
• New Perspectives for Testing Electron-Muon Universality
• Semileptonic $B_c$ decays to $P-$wave charmonium and the nature of ${\chi }_{c1}(3872)$
• $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau },{\rho }^{-}{\nu }_{\tau },{\ell }^{-}{\bar{\nu }}_{\ell }{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decays with visible final-state kinematics
• Discriminating 1D new physics solutions in $b\to s\ell \ell$ decays
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• Inclusive semileptonic $B_s^0$ meson decays at the LHC via a sum-of-exclusive modes technique: possibilities and prospects
• Nonleptonic $B_c$ decay rates from model independent relations
• Study of angular observables in exclusive semileptonic $B_c$ decays
• $\frac{|V_{ub}|}{|V_{cb}|}$ and Quest for New Physics
• Explicit parity violation in $SU(2{)}_L\otimes SU(2{)}_R\otimes U(1{)}_{B-L}$ models
• Recent progress in decays of $b$ and $c$ hadrons
• Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B}\to X_u\ell \overline{\nu }$ to $\overline{B}\to X_c\ell \overline{\nu }$ and the Ratio of their Spectra with Hadronic Tagging
• Determination of $B$-meson distribution amplitudes from $B\to \pi ,K,D$ transition form factors