Chiral Perturbation Theory with tensor sources

Abstract

We construct the most general chirally-invariant Lagrangian for mesons in the presence of external sources coupled to the tensor current \barψσ_{μν}ψ. In order to have only even terms in the chiral expansion, we consider the new source of O(p^2). With this choice, we build the even-parity effective Lagrangian up to the p^6-order (NLO). While there are only 4 new terms at the p^4-order, at p^6-order we find 78 terms for n_f=2 and 113 terms for n_f=3. We provide a detailed discussion on the different mechanisms that ensure that our final set of operators is complete and non-redundant. We also examine the odd-parity sector, to conclude that the first operators appear at the p^8-order (NNLO).

23 pages, one figure; typos corrected, one paragraph added, new section added, references added, published version

References in corpus (2)

• Generalized parton distributions for the nucleon in chiral perturbation theory
• Generalised parton distributions of the pion in partially-quenched chiral perturbation theory

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