Journal
PHYSICS LETTERS B
Volume 633, Issue 2-3, Pages 289-297Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2005.11.068
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We present new QCD sum rules for the leptonic decay constants f(K) and f(K)(parallel to.perpendicular to) of the K and K*, respectively, and the SU(3) breaking quantities a(1)(parallel to.perpendicular to)(K*), the first Gegenbauer-moments of the leading-twist distribution amplitudes of K*, including SU(3) breaking effects up to second order; we also confirm existing results for the sum rule for a(1)(K). The results for f(K) and f(K)(parallel to) agree with experiment. Our predictions for f(K)(perpendicular to) and a(1)(parallel to.perpendicular to)(K*) are relevant for the calculation of K and K* form factors, for instance T-1(B -> K)*, which determines the decay B -> K*gamma, and for QCD factorisation calculations of nonleptonic B decays into strange mesons, for instance B -> K pi. (c) 2005 Elsevier B.V. All rights reserved.
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