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Heavy--light decay constants in the continuum limit of quenched lattice QCD

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arxiv hep-lat/0307005 v2 pith:CQVZKBPR submitted 2003-07-03 hep-lat

Heavy--light decay constants in the continuum limit of quenched lattice QCD

classification hep-lat
keywords continuumdecayconstantsheavy--lightlatticelimitmesonquenched
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We compute the decay constants for the heavy--light pseudoscalar mesons in the quenched approximation and continuum limit of lattice QCD. Within the Schrodinger Functional framework, we make use of the step scaling method, which has been previously introduced in order to deal with the two scale problem represented by the coexistence of a light and a heavy quark. The continuum extrapolation gives us a value $f_{B_s} = 192(6)(4)$ MeV for the $B_s$ meson decay constant and $f_{D_s} = 240(5)(5)$ MeV for the $D_s$ meson.

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