Physics and Astronomy Calendar

Studies of semileptonic decays of the charmed mesons D0, D+, and Ds+ allow for precision measurements of two of the nine weak interaction Cabibbo-Kobayaski-Maskawa matrix elements. Because these decays are governed by both the weak and strong force, extraction of the matrix elements requires knowledge of the strong interaction effects. These effects are parametrized by form factors of the hadronic final state. Experimental measurements of these form factors are used to test various form factor predictions of charmed meson decays and also to verify the framework for form factor predictions of semileptonic decays of other particles. The CLEO-c experiment collected the products of e+e- annihilations with the e+e- beams provided by the Cornell Electron Storage Ring. Its final data samples consist of 5.4 million D0 D0bar + D+ D- events from direct production of the psi(3770) resonance and 550 thousand Ds+- Ds*-+ events from annihilations near the center-of-mass energy of 4170 MeV. I will present results of inclusive and exclusive semileptonic decays of
the D0, D+, and Ds+ mesons using these samples. This is a practice talk for my presentation to be given at the "International Workshop on e+e- Collisions from Phi to Psi" (PHIPSI09).