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
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