Charmed Pseudoscalar and Vector Mesons: a Comprehensive QCD Sum-Rule View of Their Decay Constants

Abstract

In spite of undeniable similarities of the applied techniques, somewhat different challenges are encountered when extracting, from QCD sum rules derived from two-point correlators of appropriate interpolating heavy-light quark currents, the decay constants of charmed mesons of pseudoscalar nature, on the one hand, or of vector nature, on the other hand. This observation justifies a rather careful reassessment of the corresponding results.Comment: 5 pages, contributed to "QCD@Work 2014 - International Workshop on Quantum Chromodynamics: Theory and Experiment" (16 - 19 June 2014, Giovinazzo, Bari, Italy