Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-24
Nuovo Cim.A109:727-734,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, latex, 3 figures. Talk presented at the 6th. International Symposium on Heavy Flavour Physics (Pisa, June 1995)
Scientific paper
10.1007/BF02731706
A review of the charmed meson and baryon lifetimes is presented. Our knowledge of charmed particle lifetimes has greatly improved over the past two years, a crucial r\^ole having been played by the E687 experiment at Fermilab, which has almost quadrupled the samples of $D$ mesons. The lifetime ratios $\tau(D^+)/\tau(D^0)$ and $\tau(D_s^+)/\tau(D^0)$ are now known with an accuracy of 1.7\% and 3.7\% respectively. In the baryon sector the statistics is still limited, but the experimental results on $\Lambda_c^+$, $\Xi_c^0$ and $\Xi_c^+$ exhibit a clear pattern of lifetime hierarchy, as expected from simple theoretical arguments. The first measurement of $\tau(\Omega_c^0)$ from E687 is also presented to complete the charmed baryon lifetime picture. The more accurate experimental scenario can provide information on non-perturbative QCD effects and the hadronic matrix elements.
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