| 1. |
- Bijnens, Johan, et al.
(författare)
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Hadronic matrix elements for kaons
- 2004
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Ingår i: Nuclear Physics B - Proceedings Supplements. - : Elsevier BV. - 0920-5632. ; 133, s. 245-251
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Tidskriftsartikel (refereegranskat)abstract
- We review some work done by us calculating matrix elements for Kaons. Emphasis is put on the matrix elements which are relevant to predict non-leptonic Kaon CP violating observables. In particular, we recall our results for the (B) over cap (K) parameter which governs the (K-0) over bar - K-0 mixing and update our results for epsilon(K)' including estimated all-higher-order CHPT corrections and the new results from recent analytical calculations of the DeltaI = 3/2 component. Some comments on future prospects on calculating matrix elements for Kaons are also added.
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| 2. |
- Bijnens, Johan, et al.
(författare)
-
QCD Short-distance constraints and hadronic approximations
- 2003
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Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; :4: 055
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Tidskriftsartikel (refereegranskat)abstract
- This paper discusses a general class of ladder resummation inspired hadronic approximations. It is found that this approach naturally reproduces many successes of single meson per channel saturation models (e.g. VMD) and NJL based models. In particular the existence of a constituent quark mass and a gap equation follows naturally. We construct an approximation that satisfies a large set of QCD short-distance and large N-c constraints and reproduces many hadronic observables. We show how there exists in general a problem between QCD short-distance constraints for Green Functions and those for form factors and cross-sections following from the quark-counting rule. This problem while expected for Green functions that do not vanish in purely perturbative QCD also persists for many Green functions that are order parameters.
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| 3. |
- Gamiz, E, et al.
(författare)
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Matching the electroweak penguins Q(7) and Q(8)
- 2003
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Ingår i: Nuclear Physics B - Proceedings Supplements (Proceedings of the QCD 02 9th High-Energy Physics International Conference on Quantum ChromoDynamics). - 0920-5632. ; 121, s. 195-198
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Konferensbidrag (refereegranskat)abstract
- We report on recent advances on the computation of the matrix elements of the electroweak penguins Q(7) and Q(8) which are relevant for the DeltaI = 3/2 contribution to epsilon'(K) in the chiral limit. The matching of scale and scheme dependences between Wilson coefficients and these matrix elements is done analytically at NLO in alpha(S).
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