OPE, Heavy-Quark Mass, and Heavy-Meson Decay Constants from QCD Sum Rules

Details OPE, Heavy-Quark Mass, and Heavy-Meson Decay Constants from QCD Sum Rules OPE, Heavy-Quark Mass, and Heavy-Meson Decay Constants from QCD Sum Rules

2010-11-16

arxiv.org/abs/1011.3723v1

PoS QFTHEP2010:058,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

talk presented at the "XIXth International Workshop on High Energy Physics and Quantum Field Theory - QFTHEP'10", 8 - 15 Septe

Scientific paper

We present a sum-rule extraction of the decay constants of heavy-light mesons from the two-point correlator of pseudoscalar currents. To this end, we compare the perturbative expansions for the correlator and the decay constant performed in terms of either the pole mass or the running MS-bar mass of the heavy quark. The perturbative expansion expressed in terms of the pole mass exhibits no sign of convergence whereas reorganizing this very expansion in terms of the MS-bar mass yields a rather clear hierarchy of the perturbative contributions. Accordingly, the decay constants extracted from the pole-mass correlator turn out to be considerably smaller than those extracted from its MS-bar-mass counterpart. Then, making use of the OPE in terms of the MS-bar mass we derive the decay constants of heavy mesons with emphasis on acquiring control over the uncertainties in the decay constants, related both to the input QCD parameters and to the limited accuracy of the method of sum rules. Gaining this control has become possible due to the application of our novel procedure for extracting hadron observables based on dual thresholds which depend on the Borel parameter.

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