A mistake in the computer program performing the power law fit of the numerical computation of the hadron attenuation ratio R M has been detected. The mistake affects all fits which include the Xe nucleus. Below we present corrected results for table 2 and Figs. 8-10.Based on the corrected calculation we revise our conclusion in ref. [1]. The A 2/3 power law for 1 − R M in the absorption model remains also after including the Xe nucleus in the (c,α) fit.

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Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present evidence for a small, even spinAlthough this interference significantly distorts the D + → K − π + µ + ν decay angular distributions, the new amplitude creates only a very small distortion to the observed kaon pion mass distribution when integrated over the other kinematic variables describing the decay. Our data can be described by K * 0 interference with either a constant amplitude or broad spin zero resonance.

Using a high statistics sample of photoproduced charm particles from the FOCUS experiment at Fermilab, we compare the lifetimes of neutral D mesons decaying via D0 to K- pi+ and K- K+ to measure the lifetime differences between CP even and CP odd final states. These measurements bear on the phenomenology of D0 - D0bar mixing. If the D0 to K-pi+ is an equal mixture of CP even and CP odd eigenstates, we measure yCP = 0.0342 \pm 0.0139 \pm 0.0074.Comment: 15 pages, 5 figure