| 1. |
- Bijnens, Johan, et al.
(författare)
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Matching the heavy vector meson theory
- 1998
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Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; 1998:JHEP01(1998)
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Tidskriftsartikel (refereegranskat)abstract
- We show how to obtain a "heavy" meson effective lagrangian for the case where the number of heavy particles is not conserved. We apply the method in a simple example at tree level and perform then the reduction for the case of vector mesons in Chiral Perturbation Theory in a manifestly chiral invariant fashion. Some examples showing that "heavy" meson effective theory also reproduces the correct non-analytical terms at the one-loop level are included.
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| 2. |
- Bijnens, Johan, et al.
(författare)
-
pi K scattering in three flavour ChPT : π K scattering in three flavour ChPT
- 2004
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Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; 2004:JHEP05(2004), s. 811-833
-
Tidskriftsartikel (refereegranskat)abstract
- We present the scattering lengths for the piK processes in the three flavour Chiral Perturbation Theory (ChPT) framework at next-to-next-to-leading order (NNLO). The calculation has been performed analytically but we only include analytical results for the dependence on the low-energy constants (LECs) at NNLO due to the size of the expressions. These results, together with resonance estimates of the NNLO LECs are used to obtain constraints on the Zweig rule suppressed LECs at NLO, L-4(r) and L-6(r). Contrary to expectations from NLO order calculations we find them to be compatible with zero. We do a preliminary study of combining the results from pipi scattering, piK scattering and the scalar form-factors and find only a marginal compatibility with all experimental/dispersive input data.
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| 3. |
- Bijnens, Johan, et al.
(författare)
-
Pi pi scattering in three flavor ChPT : ππ scattering in three flavour ChPT
- 2004
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; 05:JHEP01(2004)
-
Tidskriftsartikel (refereegranskat)abstract
- We present the scattering lengths for the pi-pi processes in the three flavour Chiral Perturbation Theory (ChPT) framework at next-to-next-to-leading order. We then combine this calculation with the determination of the parameters from $Ke4 and the masses and decay constants and compare with the results of a dispersive analysis of pi-pi scattering. The comparison indicates a small but nonzero value for the 1/Nc suppressed NLO low energy constants L4r and L6r.
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