B meson

Quantum mechanics

Mixing (physics)

D meson

Lepton

Meson

Nuclear physics

Particle physics

Hadron

Branching fraction

Electron–positron annihilation

Physics

Semileptonic decay

Electron

This paper 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 September 2018. In rare cases, significant results obtained several months later are also used. 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, CP violation parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements.

Averages of b-hadron, c-hadron, and $$\tau $$-lepton properties as of 2018