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VOLUME 95 | ISSUE 4 | PAGE 219
Form factors in the Bullough-Dodd related models: The Ising model in a magnetic field
O. V. Alekseev

Landau Institute for Theoretical Physics of the RAS, 117940 Moscow, Russia

Abstract
We consider particular modification of the free-field representation of the form factors in the Bullough-Dodd model. The two-particles minimal form factors are excluded from the construction. As a consequence, we obtain convenient representation for the multi-particle form factors, establish recurrence relations between them and study their properties. The proposed construction is used to obtain the free-field representation of the lightest particles form factors in the Φ1,2 perturbed minimal models. As a significant example we consider the Ising model in a magnetic field. We check that the results obtained in the framework of the proposed free-field representation are in agreement with the corresponding results obtained by solving the bootstrap equations.


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