Large-n excitations in the ferromagnetic Ising field theory in a weak magnetic field: mass spectrum and decay widths.
In the presence of a small magnetic field h, the elementary excitations in the scaling two-dimensional Ising model are studied perturbatively in in the ferromagnetic phase. For excitations with large numbers n, the mass spectrum is obtained in the first order in h. The decay widths of excitations with energies above the stability threshold are calculated in the leading h3 order.
Rutkevich
S B
SB
Institute of Solid State and Semiconductor Physics, P. Brovki 17, 220072 Minsk, Belarus. rut@ifttp.bas-net.by