C.Paus, LHC Physics: b Hadron Lifetimes and Other Essentials7 Quarks and Hadrons Hadronic effects on the width (Γ)‏ ● weak annihilation (WA)‏ ● obviously opens channel for u,c ● shortens τ u,c ● weak exchange (WE) (baryons: W scattering)‏ ● not obvious: spin conservation ● shortens τ baryon
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