Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session C6: Perturbative Methods in Forefront Computations |
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Sponsoring Units: DCOMP Chair: James Osborn, Boston University Room: Marriott Tampa Waterside Grand Salon I/J |
Saturday, April 16, 2005 1:30PM - 2:06PM |
C6.00001: The Born series in atomic collisions --- 2nd Born and higher contributions in double excitation processes Invited Speaker: In this talk I shall address the application of the Born series to coincidence studies of double excitation processes. Specifically, I shall look at (e,2e) excitation - ionization, (e,2e) excitation - autoionization and (e,3e) double ionization of ground state helium under electron impact. Without correlation the first Born amplitude is zero. Consequently, the second Born and higher terms are much more important than for single excitation processes. Correlation gives a non-zero first Born term which depends sensitively on the quality of the helium ground state wave function and the representation of the final ionized state. This latter is particularly important in (e,3e) where the final state is doubly ionized. In the second Born term there is the possibility of a two-step mechanism involving two consecutive virtual single excitations. If the second Born term is dominated by this mechanism then it should be less sensitive to correlation in the initial and final states. The computational implementation of this theory will be discussed. [Preview Abstract] |
Saturday, April 16, 2005 2:06PM - 2:42PM |
C6.00002: Automated methods for lattice perturbation theory Invited Speaker: |
Saturday, April 16, 2005 2:42PM - 3:18PM |
C6.00003: Chiral perturbation theory- connecting lattice results to experiment Invited Speaker: The application of chiral perturbation theory to lattice calculations is discussed. Because of the enormous amount of computational resources required to simulate QCD in the presence of multiple energy scales, extrapolations to light and heavy quark masses are required. If lattice simulations can be done in a regime where effective field theories such as chiral perturbation theory apply, this aids the extrapolations enormously. In this context, I review some examples where progress has been made in kaon and B physics. [Preview Abstract] |
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