The phase between the three gluon and one photon amplitudes in quarkonium decays

The phase between three-gluon and one-photon amplitudes in psi(2S) and psi(3770) decays is analyzed.Comment: 5 pages, 4 figures, Talk given at Hadron 03: 10th International Conference on Hadron Spectroscopy, Aschaffenburg, Germany, 31 Aug - 6 Sep 200

Exponential Decay for Damped Klein-Gordon Equations on Asymptotically Cylindrical and Conic Manifolds

We study the decay of the global energy for the damped Klein-Gordon equation on non-compact manifolds with finitely many cylindrical and subconic ends up to bounded perturbation. We prove that under the Geometric Control Condition, the decay is exponential, and that under the weaker Network Control Condition, the decay is logarithmic, by developing the global Carleman estimate with multiple weights