Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-08-16
Phys.Rev. D52 (1995) 6445-6450
Physics
High Energy Physics
High Energy Physics - Phenomenology
TRIUMF preprint TRI-PP-94-64, 10 pages in LaTex using RevTex macro
Scientific paper
10.1103/PhysRevD.52.6445
The construction of effective Lagrangians commonly involves the application of the `classical equation of motion' to eliminate redundant structures and thus generate the minimal number of independent terms. We investigate this procedure in the framework of chiral perturbation theory. The use of the 'classical equation of motion' is interpreted in terms of field transformations. Such an interpretation is crucial if one wants to bring a given Lagrangian into a canonical form with a minimal number of terms. We emphasize that the application of field transformations not only eliminates structures, or, what is equivalent, expresses certain structures in terms of already known different structures, but also leads to a modification of coefficients of higher--order terms. This will become relevant, once one considers effective interaction terms beyond next--to--leading order, i.e., beyond $O(p^4)$.
Fearing Harold W.
Scherer Siegfried
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