B and B_S decay constants from moments of Finite Energy Sum Rules in QCD

Details B and B_S decay constants from moments of Finite Energy Sum Rules in QCD B and B_S decay constants from moments of Finite Energy Sum Rules in QCD

2004-07-27

arxiv.org/abs/hep-ph/0407307v2

Eur.Phys.J. C38 (2004) 277-281

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures

Scientific paper

10.1140/epjc/s2004-02020-3

We use an appropriate combination of moments of finite energy sum rules in QCD in order to compute the B_q-meson decays constants f_B and f_{B_s}.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 with the so called QCD duality threshold and they are in agreement with the estimates obtained from Borel transform QCD sum rules and lattice computations.

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