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• W2167351382 abstract "In this paper we compute the decay constant of the pseudo-scalar heavy-light mesons in the heavy quark effective theory framework of QCD sum rules. In our analysis we include the recently evaluated three-loop result of order $alpha_s^2$ for the heavy-light current correlator. The value of the bottom quark mass, which essentially limits the accuracy of the sum rules for $B$ meson, is extracted from the nonrelativistic sum rules for $Upsilon$ resonances in the next-to-next-to-leading approximation. We find stability of our result with respect to all types of corrections and the specific form of the sum rule which reduces the uncertainty. Our results $f_B=206pm 20$ MeV and $f_D=195pm 20$ MeV for the $B$ and $D$ meson decay constants are in impressive agreement with recent lattice calculations." @default.
• W2167351382 created "2016-06-24" @default.
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• W2167351382 date "2002-01-28" @default.
• W2167351382 modified "2023-09-27" @default.
• W2167351382 title "Heavy-light meson decay constant from QCD sum rules in the three-loop approximation" @default.
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• W2167351382 doi "https://doi.org/10.1103/physrevd.65.054006" @default.
• W2167351382 hasPublicationYear "2002" @default.
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