Renormalized O(N) model at next-to-leading order of the 1/N expansion: Effects of the Landau pole

Fejős, Gergely and Patkós, András and Szép, Zsolt (2014) Renormalized O(N) model at next-to-leading order of the 1/N expansion: Effects of the Landau pole. PHYSICAL REVIEW D, 90 (1). ISSN 2470-0010

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Abstract

Apparently convergent contributions of resummed perturbative series at the next-to-leading order of the 1/N expansion in the O ( N) model are reanalyzed in terms of renormalizability. Compared to our earlier article [G. Fej˝os et al., Phys. Rev. D 80, 025015 (2009)], an additional subtraction is performed. We show numerically that this is indispensable for diminishing the cutoff sensitivity of some integrals below the scale of the Landau pole. Following the method of our earlier article, an improved counterterm Lagrangian is constructed in the two-particle irreducible formalism, with and without the use of an auxiliary field formulation.

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