Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-01-01
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, LATEX, no figures, 2 tables; slightly extended version of Invited Talk given at the 3rd International Conference on
Scientific paper
The status of heavy quark expansions for charm and beauty lifetime ratios is reviewed. Taking note of the surprising semiquantitative success of this description for charm hadrons I interprete the new data on $\tau (D_s)$ and re-iterate the call for more precise measurements of $\tau (\Xi_c^{0,+})$ and $\tau (\Omega_c)$. A slightly larger $B^-$ than $B_d$ lifetime is starting to emerge as predicted; the largest lifetime difference in the beauty sector, namely in $\tau (B_c)$ vs. $\tau (B)$ has correctly been predicted; the problem posed by the short $\Lambda_b$ lifetime remains. The need for more accurate data also on $\tau (B_s)$ and $\tau (\Xi_b^{-,0})$ is emphasized. I discuss quark-hadron duality as the central theoretical issue at stake here.
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