69,382 research outputs found
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
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
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