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Evidence for Light Scalar Resonances in Charm Meson Decays from Fermilab E791
From Dalitz-plot analyses of and decays, we find evidence for light and broad scalar resonances
sigma(500) and kappa(800). From a Dalitz-plot analysis of
decays, we measure the masses and decay widths of the
scalar resonances f_0(980) and f_0(1370).Comment: References added. Contribution to 5th International Conference on
Quark Confinement and the Hadron Spectrum, Gargnano, Italy, 10-14 Sep 200
Recent Charm Results from Fermilab Experiment E791
Fermilab experiment E791 studied weak decays of D+, D_s, and D^0 mesons
produced in collisions of 500 GeV/c negative pions with Pt and C targets. The
experiment collected over 200,000 fully reconstructed charm decays. Four recent
results are discussed here: (a) measurement of the form factor ratios V/A_1,
A_2/A_1, and A_3/A_1 in D->K*-l-nu and Ds->phi-l-nu decays; (b) measurement of
the difference in decay widths between the two D^0/D^0-bar mass
eigenstates; (c) search for rare and forbidden D decays to dilepton final
states; and (d) search for a ``Pentaquark,'' a bound state of c-bar-suud.Comment: 8 pages, 2 figures, contribution to XXXIVth Rencontres de Moriond,
Electroweak Interactions and Unified Theories, March, 199
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