TREE AMPLITUDES AT MULTIPARTICLE THRESHOLD IN A MODEL WITH SOFTLY BROKEN O(2) SYMMETRY

Authors
LIBANOV MV RUBAKOV VA TROITSKY SV
Citation
Mv. Libanov et al., TREE AMPLITUDES AT MULTIPARTICLE THRESHOLD IN A MODEL WITH SOFTLY BROKEN O(2) SYMMETRY, Nuclear physics. B, 412(3), 1994, pp. 607-620
Citations number
23
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. B → ACNP
ISSN journal
05503213
Volume
412
Issue
3
Year of publication
1994
Pages
607 - 620
Database
ISI
SICI code
0550-3213(1994)412:3<607:TAAMTI>2.0.ZU;2-1
Abstract
Tree amplitudes of the production of two kinds of scalar particles at threshold from one virtual particle are calculated in a model of two s calar fields with O(2) symmetric quartic interaction and unequal masse s. These amplitudes exhibit interesting factorial and exponential beha viour at large multiplicities. As a by-product we observe that the kin ematically allowed decay of one real particle into n real particles of another kind, all at rest, has zero tree amplitude in this model for n > 2.