Nonperturbative three-point functions of the O( N) sigma model in the 1/ N expansion at NLO

We present a calculation of the three-point functions of the O( N)-symmetric sigma model. The calculation is done nonperturbatively by means of a higher-order 1/ N expansion combined with a tachyonic regularization which we proposed in previous publications. We use the results for calculating the st...

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Bibliographic Details
Published in:Physics letters. B 1999, Vol.450 (1), p.220-224
Main Authors: Ghinculov, Adrian, Binoth, Thomas
Format: Article
Language:English
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Summary:We present a calculation of the three-point functions of the O( N)-symmetric sigma model. The calculation is done nonperturbatively by means of a higher-order 1/ N expansion combined with a tachyonic regularization which we proposed in previous publications. We use the results for calculating the standard model process f f ̄ →H→WW nonperturbatively in the quartic coupling of the scalar sector.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(99)00022-2