Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-20
Phys.Rev. D70 (2004) 094002
Physics
High Energy Physics
High Energy Physics - Phenomenology
a comment and a reference added, version to appear in Phys.Rev.D, 17 pages, 7 figures
Scientific paper
10.1103/PhysRevD.70.094002
We present a new calculation of the first Gegenbauer moment $a_1^K$ of the kaon light-cone distribution amplitude. This moment is determined by the difference between the average momenta of strange and nonstrange valence quarks in the kaon. To calculate $a_1^K$, QCD sum rule for the diagonal correlation function of local and nonlocal axial-vector currents is used. Contributions of condensates up to dimension six are taken into account, including $O(\alpha_s)$-corrections to the quark-condensate term. We obtain $a_1^K=0.05\pm 0.02$, differing by the sign and magnitude from the recent sum-rule estimate from the nondiagonal correlation function of pseudoscalar and axial-vector currents. We argue that the nondiagonal sum rule is numerically not reliable. Furthermore, an independent indication for a positive $a_1^K$ is given, based on the matching of two different light-cone sum rules for the $K\to\pi$ form factor. With the new interval of $a_1^K$ we update our previous numerical predictions for SU(3)-violating effects in $B_{(s)}\to K$ form factors and charmless (B) decays.
Khodjamirian Alexander
Mannel Th.
Melcher Martin
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