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Elliptical Flow of Strange Particles from Au+Au Collisions at (SNN)1/2 =200GeV

Author: XuFuZhu
Tutor: HuoLei
School: Harbin Institute of Technology
Course: Particle Physics and Nuclear Physics
Keywords: High energy heavy ion collisions Strange particles Elliptic flow AMPT model
CLC: O572.21
Type: Master's thesis
Year: 2010
Downloads: 33
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Abstract


The main purpose of the physics of high energy heavy ion collisions is to study nuclear nuclear collisions of high-temperature, high-pressure nature of the nuclear matter; elliptic flow is able to reflect the important physical quantities of nuclear nuclear collision early information. RHIC experiments began in 2000 in the physics of high-energy nuclear nuclear collision open a new field of study; found especially in the field of elliptic flow hadron elliptic flow constituent quark number scaling is the most important finding of the RHIC experiments a. This article uses the the AMPT model of simulated 200GeV Gold collision, data analysis and simulation events. Hadron cascade stage before and after the strange particles and non-strange particle rapidity distribution quark combinations singular baryon the hadron cascade stages will decay, and to generate π and proton, these particles will change fast degree distribution. Analysis of the final state strange particle impact parameter dependence of elliptic flow of strange particles impact parameter dependence is sensitive to the impact parameter b = 0 ~ 3 fm elliptic flow little. Elliptic flow of strange particles and their constituent quark logarithmic scale is the most important finding of the RHIC experiments, this finding may indicate the RHIC experiments lifted quark elliptic flow of strange particles and their component quarks logarithmic scale with the transverse momentum pt of the changes as well as quark elliptic flow with transverse momentum pt changes, we compare the size of these elliptic flow. This paper focuses on the impact of strange particles elliptic flow impact of factors, including the different parton interaction cross section for the elliptic flow of strange particles, the impact of the the unbalanced factors for elliptic flow of strange particles, hadron cascade stage for singular flow of particles oval. Parton reaction cross section, the the quark collision intensity is not the same, the change in momentum will be different elliptic flow of strange particles final state parton reaction cross section. Parton interaction cross a greater impact for the meson and baryon. Were generally considered to produce a perfect fluid, we compared the relationship between the size of the AMPT model elliptic flow and fluid limits analysis get: softkeys for the AMPT model elliptic flow smaller than the hydrodynamic limit, mainly due to resonance states from and singular baryon decay. Study strange particles elliptic flow ART (the hadron cascade) before and after stage changes, and with non-strange particle elliptic flow changes a comparative analysis, draw strange particles in hadron cascade stage are less affected elliptic flow the main stage of the formation of the parton elliptic flow of strange particles of this nature to reflect the collision the early information.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle physics > Experiments and determination
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