Braun, Vladimir M. and Lenz, A. (2004) SU(3) symmetry-breaking corrections to meson distribution amplitudes. PHYSICAL REVIEW D, 70 (7): 074020. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
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 by-product 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QCD SUM-RULES; TWIST DISTRIBUTION AMPLITUDES; QUARK-GLUON CONDENSATE; FLAVOR DEPENDENCE; VECTOR-MESONS; EXOTIC MESONS; DECAYS; STRANGE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jun 2021 10:19 |
| Last Modified: | 28 Jun 2021 10:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37162 |
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