Chiral perturbation theory with tensor sources


We construct the most general chirally invariant Lagrangian for mesons in the presence of external sources coupled to the tensor current ψ̄ σμνψ. In order to have only even terms in the chiral expansion, we consider the new source of O(p2). With this choice, we build the even-parity effective Lagrangian up to the p6-order (NLO). While there are only 4 new… (More)

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