Evidence for Light Scalar Resonances in Charm Meson Decays from Fermilab E791

From Dalitz-plot analyses of $D^+\to\pi^-\pi^+\pi^+$ and $D^+\to K^-\pi^+\pi^+$ decays, we find evidence for light and broad scalar resonances sigma(500) and kappa(800). From a Dalitz-plot analysis of $D^+_s\to\pi^-\pi^+\pi^+$ 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 $\Delta\Gamma$ 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

An X-ray View of Radio Sources

We review recent examples where the synergy between radio and X-ray observations has led to substantial progress in understanding astronomical systems. The sub-arcsecond imaging capabilities of the Chandra X-ray observatory provides a 100-fold improvement for comparing X-ray and radio structures. We specifically discuss examples which provide insight into the outflow of material and energy from pulsars and supernovae, the centers of clusters of galaxies, and the nuclei of quasars.Comment: 17 pages, 13 figures. Talk presented at the JENAM-2003 Symposium, "Radio Astronomy at 70: from Karl Jansky to microjansky," Budapest, Hungary, 27-30 August 2003. To be published by EDP Sciences, eds. L. Gurvits, S. Frey, and S. Rawling