OPE, charm-quark mass, and decay constants of D and D(s) mesons from QCD sum rules
- Author(s)
- Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
- Abstract
We present a sum-rule extraction of the decay constants of the charmed mesons D and D(s) from the two-point correlator of pseudoscalar currents. First, we compare the perturbative expansion for the correlator and the decay constant performed in terms of the pole and the running (MS) over bar masses of the charm quark. The perturbative expansion in terms of the pole mass shows no signs of convergence whereas reorganizing this very expansion in terms of the (MS) over bar mass leads to a distinct hierarchy of the perturbative expansion. Furthermore, the decay constants extracted from the pole-mass correlator turn out to be considerably smaller than those obtained by means of the (MS) over bar -mass correlator. Second, making use of the OPE in terms of the (MS) over bar mass, we determine the decay constants of both D and D(s) mesons with an emphasis on the uncertainties in these quantities related both to the input QCD parameters and to the limited accuracy of the method of sum rules.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Sapienza University of Rome, Österreichische Akademie der Wissenschaften (ÖAW), Universität Wien, Anuchin Research Institute and Museum of Anthropology
- Journal
- Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
- Volume
- 701
- Pages
- 82-88
- No. of pages
- 7
- ISSN
- 0370-2693
- DOI
- https://doi.org/10.1016/j.physletb.2011.05.031
- Publication date
- 2011
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103036 Theoretical physics, 103034 Particle physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/ope-charmquark-mass-and-decay-constants-of-d-and-ds-mesons-from-qcd-sum-rules(d04d8913-7d9c-42bd-82b1-f0fa6450fa1f).html