Extension of the Chiral Perturbation Theory Meson Lagrangian to Order $P^6$

Abstract

We have derived the most general chirally invariant Lagrangian ${\mathcal{L}}_6$ for the meson sector at order $p^6$. The result provides an extension of the standard Gasser-Leutwyler Lagrangian ${\mathcal{L}}_4$ to one higher order, including as well all the odd intrinsic parity terms in the Lagrangian. The most difficult part of the derivation was developing a systematic strategy so as to get all of the independent terms and eliminate the redundant ones in an efficient way. The 'equation of motion' terms, which are redundant in the sense that they can be transformed away via field transformations, are separated out explicitly. The resulting Lagrangian has been separated into groupings of terms contributing to increasingly more complicated processes, so that one does not have to deal with the full result when calculating $p^6$ contributions to simple processes.

59 pages in LaTex, using RevTex macro, TRIUMF preprint TRI-PP-94-68

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