title: Phase transition in a triplet process.
abstract: We argue that the reaction-diffusion process 3A-->4A,3A-->2A exhibits a different type of continuous phase transition from an active into an absorbing phase. Because of the upper critical dimension d(c)> or =4/3 we expect the phase transition in 1+1 dimensions to be characterized by nontrivial fluctuation effects.
authors.affiliation: Department of Physics, Korea University, Seoul 136-701, Korea.
authors.forename: Kwangho
authors.initials: K
authors.lastname: Park
authors.forename: Haye
authors.initials: H
authors.lastname: Hinrichsen
authors.forename: In-Mook
authors.initials: IM
authors.lastname: Kim