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Why study B hadrons ? 2 • Heavy quark hadrons are the hydrogen atom of QCD (we can use perturbative QCD to describe the potential quite well) Properties: Focus on masses , lifetimes (decays) Why B Hadron Lifetimes ? • The measurement of lifetimes (and ratios) can be used to evaluate deviations from the naive spectator quark model : b quark decays like free "particle" => all B hadron lifetimes are equal • In reality QCD => lifetimes of B hadrons study the interplay between strong and weakdoi:10.1063/1.3536561 fatcat:72r3os35tbembdx5a54urq25na