Decay constants of the charmed vector mesons D* and D-s* from QCD sum rules

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

Abstrakt

We present a sum-rule calculation of the decay constants of the charmed vector mesons D∗ and D∗s from the two-point correlator of vector currents. First, we show that the perturbative expansion in terms of the pole mass exhibits no sign of convergence whereas the reorganization of this expansion in terms of the MS¯¯¯¯¯ mass leads to a distinct hierarchy. Second, making use of the operator product expansion in terms of the MS¯¯¯¯¯ mass, we determine the decay constants of the D∗ and D∗s mesons with an emphasis on the uncertainties in these theoretically predicted quantities related both to the input QCD parameters and to the limited accuracy of the method of sum rules. Our results are fD∗=(252.2±22.3OPE±4syst)MeV and fD∗s=(305.5±26.8OPE±5syst)MeV. For the ratios of the vector-to-pseudoscalar decay constants we report fD∗/fD=1.221±0.080OPE±0.008syst and fD∗s/fDs=1.241±0.057OPE±0.007syst.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Lomonosov Moscow State University (MSU), Universität Wien, Istituto Nazionale di Fisica Nucleare (INFN), Roma, Österreichische Akademie der Wissenschaften (ÖAW)

Journal

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

Band

735

Seiten

12-18

Anzahl der Seiten

7

ISSN

0370-2693

DOI

https://doi.org/10.1016/j.physletb.2014.06.007

Publikationsdatum

07-2014

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/decay-constants-of-the-charmed-vector-mesons-d-and-ds-from-qcd-sum-rules(d771179d-5e24-4801-8723-27c1a6a4e092).html