Non-perturbative effects and infrared renormalons within the 1/N expansion of the O(N) non-linear sigma model |
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Authors: | F David |
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Institution: | CEN-Saclay, 91191 Gif-sur-Yvette, Cedex France |
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Abstract: | We analyze the structure of the Borel transform of the two-dimensional O(N) non-linear σ model within its expansion. We check the existence of IR singularities (IR renormalons) and the presence of non-perturbative terms which organize themselves in an operator expansion à la Shifman-Vainshtein-Zakharov. We prove that renormalons cancel between the different terms of the operator expansion, so that there is a well-defined resummation procedure of the perturbative series. We suggest that this mechanism provides a general solution of the IR renormalons problem for massless UV free field theories. |
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