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Decay of particles above threshold in Ising field theory with magnetic field

Show simple item record Delfino, Gesualdo en_US Grinza, Paolo en_US Mussardo, Giuseppe en_US 2005 en_US 2011-09-07T20:27:43Z 2005 en_US 2011-09-07T20:27:43Z 2005 en_US
dc.identifier.citation Nucl.Phys. B737 (2006) 291-303 en_US
dc.identifier.uri en_US
dc.description.abstract The two-dimensional scaling Ising model in a magnetic field at critical temperature is integrable and possesses eight stable particles Ai (i = 1, . . . , 8) with different masses. The heaviest five lie above threshold and owe their stability to integrability. We use form factor perturbation theory to compute the decay widths of the first two particles above threshold when integrability is broken by a small deviation from the critical temperature. The lifetime ratio t4/t5 is found to be 0.233; the particle A5 decays at 47% in the channel A1A1 and for the remaining fraction in the channel A1A2. The increase of the lifetime with the mass, a feature which can be expected in two dimensions from phase space considerations, is in this model further enhanced by the dynamics. en_US
dc.format.extent 214132 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries SISSA;53/2005/FM en_US
dc.relation.ispartofseries;hep-th/0507133 en_US
dc.relation.uri 10.1016/j.nuclphysb.2005.12.024 en_US
dc.title Decay of particles above threshold in Ising field theory with magnetic field en_US
dc.type Preprint en_US
dc.contributor.department Mathematical Physics en_US
dc.contributor.area Mathematics en_US

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