2013/08/31 by Hrachya M. Babujian, Angela Foerster, Michael Karowski · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1007/jhep11(2013)089
published as JHEP 11 (2013) 089 · 51 pages, additional text and references
arxiv created 2013/10/14 · arxiv updated 2016/03/02
A general form factor formula for the O(N)σ-model is constructed and applied to several operators. The large N limits of these form factors are computed and compared with the 1/N expansion of the O(N)σ-model in terms of Feynman graphs and full agreement is found. In particular, O(3) and O(4) form factors are discussed. For the O(3)σ-model several low particle form factors are calculated explicitly.