Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-26
Phys. Lett. B 687, 48-52 (2010)
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages
Scientific paper
10.1016/j.physletb.2010.02.080
We compare the extraction of the ground-state decay constant from the two-point correlator in QCD and in potential models and show that the results obtained at each step of the extraction procedure follow a very similar pattern. We prove that allowing for a Borel-parameter-dependent effective continuum threshold yields two essential improvements compared to employing a Borel-parameter-independent quantity: (i) It reduces considerably the (unphysical) dependence of the extracted bound-state mass and the decay constant on the Borel parameter. (ii) In a potential model, where the actual value of the decay constant is known from the Schroedinger equation, a Borel-parameter-dependent threshold leads to an improvement of the accuracy of the extraction procedure. Our findings suggest that in QCD a Borel-parameter dependent threshold leads to a more reliable and accurate determination of bound-state characteristics by the method of sum rules.
Lucha Wolfgang
Melikhov Dmitri
Simula Silvano
No associations
LandOfFree
Extraction of ground-state decay constant from dispersive sum rules: QCD vs potential models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extraction of ground-state decay constant from dispersive sum rules: QCD vs potential models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extraction of ground-state decay constant from dispersive sum rules: QCD vs potential models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-122351