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Nonanalytic m 1/2 q and m q ln m q chiral corrections to the baryon magnetic moments are computed. The calculation includes contributions from both intermediate octet and decuplet baryon states. Unlike the one-loop contributions to the baryon axial currents and masses, the contribution from decuplet intermediate states does not partially cancel that from(More)
The decay constants for the D and D S mesons, denoted f D and f D S respectively, are equal in the SU (3) V limit, as are the hadronic amplitudes for B S −B S and B 0 −B 0 mixing. The leading SU (3) V violating contribution to (f D S /f D) and to the ratio of hadronic matrix elements relevant for B S − B S and B 0 − B 0 mixing amplitudes are calculated in(More)
These lectures introduce some of the basic ideas of effective field theories. The topics discussed include: relevant and irrelevant operators and scaling, renormal-ization in effective field theories, decoupling of heavy particles, power counting, and naive dimensional analysis. Effective Lagrangians are used to study the ∆S = 2 weak interactions and chiral(More)
Goldstone's theorem states that there is a massless mode for each broken symmetry generator. It has been known for a long time that the naive generalization of this counting fails to give the correct number of massless modes for spontaneously broken spacetime symmetries. We explain how to get the right count of massless modes in the general case, and(More)
These lectures introduce some of the basic ideas of eective eld theories. The topics discussed include: relevant and irrelevant operators and scaling, renormal-ization in eective eld theories, decoupling of heavy particles, power counting, and naive dimensional analysis. Eective Lagrangians are used to study the S = 2 w eak interactions and chiral(More)
The interaction of quarkonium with nuclei is studied in the m Q → ∞ limit of QCD, where the binding energy is found to be exactly computable. The dominant contribution to the interaction is from two-gluon operators. The forward matrix elements of these two-gluon operators can be determined from the QCD scale anomaly, and from deep inelastic scattering. We(More)