We study a phase transition in a non-equilibrium model first introduced in[5], using the Yang-Lee description of equilibrium phase transitions in termsof both canonical and grand canonical partition function zeros. The modelconsists of two different classes of particles hopping in opposite directionson a ring. On the complex plane of the diffusion rate we find two regions ofanalyticity for the canonical partition function of this model which can beidentified by two different phases. The exact expressions for both distributionof the canonical partition function zeros and their density are obtained in thethermodynamic limit. The fact that the model undergoes a second order phasetransition at the critical point is confirmed. We have also obtained the grandcanonical partition function zeros of our model numerically. The similaritiesbetween the phase transition in this model and the Bose-Einstein condensationhas also been studied.
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