El-Khadra, A. X., Kronfeld, A. S., Mackenzie, P. B., Ryan, S. M., Simone, J. N. ‘ B and D meson decay constants in lattice QCD’ in Physical Review D, 58, 1998, pp 014506-1 – 014506-10
Physical Review D 58 1
We have calculated the decay constants of B and D mesons with lattice QCD. We use an O(a)-improved
action that takes light quark actions as a starting point, tuned so that it can be directly applied at the physical
masses of the b and c quarks. Our results are f B5164211
11468 MeV, f Bs
11369 MeV, f D5194210
610 MeV, and f Ds
114611 MeV in the quenched approximation. The first error in each case is statistical,
and the second is from perturbation theory. We show that discretization errors are under control in our
approach and smaller than our statistical errors. The effects of the quenched approximation may raise our
quenched result by up to 10%.
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