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

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

Abstrakt

We present a sum-rule extraction of decay constants of heavy mesons from the two-point correlator of heavy-light pseudoscalar currents. Our primary concern is to control the uncertainties of the decay constants, induced by both input QCD parameters and limited accuracy of the sum-rule method. Gaining this control is possible by applying our novel procedure for the extraction of hadron observables utilizing Borel-parameter-depending dual thresholds. For the charmed mesons, we obtain f(D) = (206.2 +/- 7.3((OPE)) +/- 5.1((syst))) MeV and f(Ds) = (245.3 +/- 15.7((OPE)) +/- 4.5((syst))) MeV. In the case of the beauty mesons, the decay constants prove to be extremely sensitive to the exact value of the b-quark (MS) over bar mass (m) over bar (b) ((m) over bar (b)). By matching our sum-rule prediction for f(B) to the lattice outcomes, the very accurate b-mass value (m) over bar (b) ((m) over bar (b))=(4.245 perpendicular to 0.025) GeV is found, which yields f(B) = (193.4 + 12.3((OPE)) + 4.3((syst))) MeV and f(Bs) = (232.5 + 18.6((OPE)) + 2.4((syst))) MeV

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Università degli Studi di Roma La Sapienza, Österreichische Akademie der Wissenschaften (ÖAW)

Seiten

379-381

Anzahl der Seiten

3

DOI

https://doi.org/10.1063/1.3575035

Publikationsdatum

2011

ÖFOS 2012

103034 Teilchenphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b93d05e9-52b8-4d7c-bb31-b81672240de6