Abstract
This article reports world averages of measurements of b-hadron, c-hadron, and tau -lepton properties obtained by the Heavy Flavor Averaging Group using results available through summer 2016. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, C!P violation parameters, parameters of semileptonic decays, and Cabbibo–Kobayashi–Maskawa matrix elements.
Highlights
Flavor dynamics plays an important role in elementary particle interactions
Many Bs0 lifetime analyses, in particular the early ones performed before the non-zero value of s was firmly established, ignore s and fit the proper time distribution of a sample of Bs0 candidates reconstructed in a certain final state f with a model assuming a single exponential function for the signal
The B0 → D∗+τ ντ decay was first observed by Belle [579] performing an “inclusive” reconstruction, which is based on the reconstruction of the Btag from all the particles of the events, other than the D(∗) and the lepton candidate, without looking for any specific Btag decay chain
Summary
Semileptonic decays of D mesons involve the interaction of a leptonic current with a hadronic current. The latter is nonperturbative and cannot be calculated from first principles; it is usually parameterized in terms of form factors. Where m D and p are the mass and four momentum of the parent D meson, m P and p are those of the daughter meson, f+(q2) and f0(q2) are form factors, and q = p − p. Where p∗ is the magnitude of the momentum of the final state hadron in the D rest frame, and θ is the angle of the lepton in the ν rest frame with respect to the direction of the pseudoscalar meson in the D rest frame
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