Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-23
Phys.Rev. D70 (2004) 074020
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages,4 figures
Scientific paper
10.1103/PhysRevD.70.074020
We consider constraints on the momentum fraction of the $K$ and $K^*$ meson carried by the strange quark that follow from exact operator identities, similar to those for the divergence of the quark part of the QCD energy-momentum tensor. The existing QCD sum rule estimates are reanalyzed in this context. Our conclusions essentially support the constituent quark-model picture where the momentum fraction is roughly proportional to the constituent quark mass, but the asymmetry turns out to be smaller compared to the naive quark model estimates. As a byproduct of this study, we calculate the SU(3)-breaking quark-antiquark-gluon matrix elements that determine the leading conformal spin contributions to the asymmetry in twist-four distribution amplitudes of strange mesons $K$ and $K^*$, and also update the estimate for the SU(3) breaking for the quark-antiquark-gluon vacuum condensate.
Braun Vladimir M.
Lenz Alexander
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