OPE, charm-quark mass, and decay constants of D and D(s) mesons from QCD sum rules

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Università degli Studi di Roma La Sapienza, Österreichische Akademie der Wissenschaften (ÖAW), Universität Wien, Lomonosov Moscow State University (MSU)

Journal

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Band

701

Seiten

82-88

Anzahl der Seiten

7

ISSN

0370-2693

DOI

https://doi.org/10.1016/j.physletb.2011.05.031

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103034 Teilchenphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/ope-charmquark-mass-and-decay-constants-of-d-and-ds-mesons-from-qcd-sum-rules(d04d8913-7d9c-42bd-82b1-f0fa6450fa1f).html