Decay Constants of Beauty Mesons from QCD Sum Rulesстатья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2015 г.
Аннотация:Our recently completed analysis of the decay constants of both pseudoscalar and vector beauty mesons reveals that in the bottom-quark sector two specific features of the sum-rule predictions show up: (i) For the input value of the bottom-quark mass in the M̅S̅ scheme m̅_b(m̅_b) = 4:18 GeV; the sum-rule result f_B = 210-220 MeV for the B meson decay constant is substantially larger than the recent lattice-QCD finding f_B = 190 MeV: Requiring QCD sum rules to reproduce the lattice-QCD value of f_B yields a significantly larger b-quark mass: m̅_b(m̅_b)= 4:247 GeV: (ii) Whereas QCD sum-rule predictions for the charmed-meson decay constants f_D; f_Ds, f_D* and f_Ds* are practically independent of the choice of renormalization scale, in the beauty sector the results for the decay constants-and especially for the ratio f_B* / f_B-prove to be very sensitive to the specific scale setting.