Averages of b-hadron, c-hadron, and tau-lepton properties as of early 2012

TL;DR

This paper compiles and updates the world averages of b-hadron, c-hadron, and tau-lepton properties based on measurements up to early 2012, providing a comprehensive summary of their fundamental parameters.

Contribution

It presents the latest combined averages of heavy flavor and tau-lepton properties, incorporating new results and standardized analysis methods for improved accuracy.

Findings

Updated averages of lifetimes and branching fractions.

Refined measurements of CP violation parameters.

Consistent values for CKM matrix elements.

Abstract

This article reports world averages of measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available through the end of 2011. In some cases results available in the early part of 2012 are included. 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 CKM matrix elements.