Pineda, Antonio (Pineda Ruiz)2010-05-062010-05-0620020556-2821https://hdl.handle.net/2445/12464In the framework of potential NRQCD, we obtain the next-to-leading-log renormalization-group running of the matching coefficients for the heavy quarkonium production currents near threshold. This allows to obtain S-wave heavy-quarkonium production/annihilation observables with next-to-leading-log accuracy within perturbative QCD. In particular, we give expressions for the decays of heavy quarkonium to e^+e^- and to two photons. We also compute the O(m\alpha^8\ln^3\alpha) corrections to the Hydrogen spectrum.8 p.application/pdfeng(c) The American Physical Society, 2002Teoria de camps (Física)Particles (Nuclear physics)Teoria de camps (Física)Renormalització (Física)Pertorbació (Dinàmica quàntica)Field theory (Physics)Partícules (Física nuclear)Renormalization (Physics))Perturbation (Quantum dynamics)info:eu-repo/semantics/article508380info:eu-repo/semantics/openAccess