Spectra Of Particles In D+Au Collision System At RHIC With Tsallis Statistics

In relativistic heavy ion collisions, the main physical goal is to study the properties of the extreme hot and dense matter created in such strong interactions in the laboratory. Compared to the p+p collisions with the same energy, the particle production in relativistic heavy ion collisions includes both thermonuclear matter effect of final state and cold nuclear matter effect of initial state. Through the particle spectra in d+Au collisions at RHIC, we can distinguish these two effects and give an in-depth study on the cold nuclear effect of initial state, and provide a good platform for searching the Color Glass Condensate phenomenon.In this paper, we use the Blast-Wave model based on the Tsallis statistics to study particle spectra in d+Au collisions at RHIC. Tsallis statistics is a non-extensive statistics and can be used to describe the non-equilibrium system, introduced to handle the overwhelming correlation and fluctuation in the strong interaction processes. We have systematically studied the identified particle spectra in d+Au collisions at (?)SNN=200GeV at RHIC using this model, the particles are π±、K±、 ρ0、K*0、K*、π0、η、φ、ω、p(p)、△++、∑*at mid-rapidity and J/ψ,π±、K±、p(p) at forward rapidity (or backward rapidity), obtained the physical parameters closely related to the properties and the evolution of the cold nuclear matter effect:the radial flow velocity, the freeze-out temperature and the degree of non-equilibrium. We also study the dependence of different radial flow velocity distribution.The study found that the average radial flow at200GeV d+Au collisions is not zero, between p+p collision system and Au+Au collison system at the same energy, and the average radial flow of d+Au system is significantly lower than that of Au+Au system. These results show that the radial flow of d+Au collisons mainly originates from the cold nuclear matter effect, not only the cold nuclear matter effect exists in Au+Au collisions, but also a stronger thermonuclear matter effect. The results of J/Ψ at the backward rapidity show that the average radial flow is not zero, meaning the existence of initial state effects (Color Glass Condensate,CGC) in d+Au collisions system.