Baryon masses and nucleon sigma terms in manifestly Lorentz-invariant baryon chiral perturbation theory

B. C. Lehnhart; J. Gegelia; S. Scherer

Baryon masses and nucleon sigma terms in manifestly Lorentz-invariant baryon chiral perturbation theory

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arxiv hep-ph/0412092 v1 pith:PSRPCYSN submitted 2004-12-07 hep-ph nucl-exnucl-th

B. C. Lehnhart , J. Gegelia , S. Scherer This is my paper · ORCID

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keywords baryonchirallorentz-invariantmanifestlymassesnucleonperturbationsigma

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We discuss the masses of the ground state baryon octet and the nucleon sigma terms in the framework of manifestly Lorentz-invariant baryon chiral perturbation theory. In order to obtain a consistent power counting for renormalized diagrams the extended on-mass-shell renormalization scheme is applied.

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Including the Delta(1232) resonance in a third-order covariant chiral perturbation theory fit reproduces near-threshold pion photoproduction data across all charge channels far better than leaving it out.

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