Narrow Results

Using the data sample taken at the center-of-mass energies 3.773, 4.18 and 4.6 GeV by the BESIII detector, BESIII colloboration studied the semileptonic and leptonic charmed hadron decays very well in recent years. The studies mainly contains the precision measurements of decay constants, form factors and CKM matrix elements. The properties of a₀(980), f₀(500), f₀(980) and K₁(1270)⁰ have also been extracted. BESIII also test the LFU at a very high precision.

Numerous recent measurements of kaon decays are described, with an emphasis on results offering constraints on chiral perturbation theory calculations. An up-to-date estimate of |V_us|f₊(0) based on semileptonic kaon decay rates is presented.

The current status of the determinations of the CKM elements V_ub and V_cb is reviewed and future prospects are discussed.

We present here the current impact of the lattice QCD calculations in the Unitarity Triangle analysis, updated with all the most recent results, such as the meson mixing amplitude by CDF and the determinations of the angles α, β and γ from non-leptonic decays by the B factories. Then, using only the angle measurements, we determine the CKM matrix parameters in a lattice-free fit from which we extract predictions on lattice quantities, to be compared with calculations. We show that the recent measurement of Δm_s, combined with Δm_d and ∊_K ones, allows for a quite accurate extraction of the values of the lattice parameters, , , ζ and f_B. We also discuss the different determinations of V_ub and show that current data do not favor the value obtained from inclusive decays. Finally, we present updated predictions for the leptonic branching fraction BR(B → τν_τ), and compare them with the recent experimental determination.

Future kaon initiatives are reviewed. A rich program spanning from the study of rare kaon decays to the search for transverse muon polarization in semileptonic decays promise to deeply push our understanding of the flavor sector, the least tested of the Standard Model.

We report measurements of the inclusive electron energy spectrum and hadron invariant mass spectrum for charmed semileptonic decays of B mesons in a 140 fb^-1 data sample collected with the Belle detector at the KEKB e⁺e^- collider. We determine the first four central moments and partial branching fraction of the electron energy spectrum for electron energy thresholds from 0.4 to 2.0 GeV, and the first two central and second non-central moments of the hadron invariant mass spectrum for lepton energy thresholds from 0.7 to 1.9 GeV. Using these measurements and Belle measurements of the photon energy moments in B → X_sγ decays, we determine the CKM matrix element |V_cb|, the b quark mass and higher order non-perturbative parameters that appear in the Heavy Quark Expansion by performing a global fit analysis in the kinetic mass and 1S schemes.

Measurements on superallowed 0⁺ → 0⁺ nuclear beta transitions currently provide the most demanding test of the Conserved Vector Current (CVC) hypothesis and the most precise value for the up-down element, V_ud, of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. Both are sensitive probes for physics beyond the Standard Model. Analysis of the experimental results depends on small radiative and isospin-symmetry-breaking corrections, the validity of which is being probed by current measurements. We report on the current status of world data in light of recent improvements in both measurement and theory.

Questions to discuss:

• Does QCD help us to understand strong interactions?
• Does the SM theory with Kobayashi-Maskawa (CKM) quark-mixing matrix describe all CP-violation and rare decays phenomena observed in the heavy quark sector?
• Can quantum loop corrections reveal new physics mass scales well above the TeV scale, by means of indirect searches?
• Is the low-energy supersymmetry of TeV scale in trouble after the LHC results on its direct search?