https://doi.org/10.1140/epjc/s2004-02020-3
theoretical physics
B and B s decay constants from moments of finite energy sum rules in QCD
Departamento de Física Teórica-IFIC, Universitat de Valencia, 46100, Burjassot-Valencia, Spain
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Abstract
We use an appropriate combination of moments of finite energy sum rules in QCD in order to compute the B
q
-meson decay constants f
B
and 
. We perform the calculation using a two-loop computation of the imaginary part of the pseudoscalar two point function in terms of the running bottom quark mass. The results are stable against the so-called QCD duality threshold, and they are in agreement with the estimates obtained from Borel transform QCD sum rules and lattice computations.
© Springer-Verlag, 2004
