Abstract:We investigate degree of coherence of pion sources produced in relativistic heavy ion collisions using multiparticle interferometry. In order to obtain "true" chaoticity, λ true from two-pion correlation functions measured in experiments, we make a correction for long-lived resonance decay contributions. Using this λ true and the weight factor which are obtained from parameter fitted to two-and three-pion correlation function, we calculate a chaotic fraction ε and the number of coherent sources α for different… Show more
“…The value of two-pion correlation function at the zero relative momentum is less than two after the final-state interaction is removed in the case of chaotic sources. The result suggests that the sources are partially coherent due to the collective action of a large group of nucleons in addition to the chaoticity coming from isolated nucleon-nucleon collisions in the pion field [2,4, [7][8][9][10][11][12][13][14]. A more detailed investigation on partially coherent pion field can reveal the kinematic information on pion-emitting mechanism.…”
We examine two-pion Bose-Einstein correlations for partially coherent particle-emitting sources within quantum statistical formalism, where the sources are treated as classical currents with chaotic and coherent components. The two-pion correlation functions of the partially coherent sources contain a phase which is sensitive to the asymmetry of the source emission function. We investigate the influence of source opacity and expansion in high energy heavy ion collisions on the phase by Monte Carlo calculations. We find that these two physical effects shift the phase from zero. The Gaussian-formula fit results to the simulated two-pion correlation functions indicate that the opaque and expansion effects lead to a smaller interferometry radius R out and a larger λ parameter.two-pion correlation, partially coherent sources, asymmetry 25.75.Nq, 25.75.Gz
“…The value of two-pion correlation function at the zero relative momentum is less than two after the final-state interaction is removed in the case of chaotic sources. The result suggests that the sources are partially coherent due to the collective action of a large group of nucleons in addition to the chaoticity coming from isolated nucleon-nucleon collisions in the pion field [2,4, [7][8][9][10][11][12][13][14]. A more detailed investigation on partially coherent pion field can reveal the kinematic information on pion-emitting mechanism.…”
We examine two-pion Bose-Einstein correlations for partially coherent particle-emitting sources within quantum statistical formalism, where the sources are treated as classical currents with chaotic and coherent components. The two-pion correlation functions of the partially coherent sources contain a phase which is sensitive to the asymmetry of the source emission function. We investigate the influence of source opacity and expansion in high energy heavy ion collisions on the phase by Monte Carlo calculations. We find that these two physical effects shift the phase from zero. The Gaussian-formula fit results to the simulated two-pion correlation functions indicate that the opaque and expansion effects lead to a smaller interferometry radius R out and a larger λ parameter.two-pion correlation, partially coherent sources, asymmetry 25.75.Nq, 25.75.Gz
Analytical solution of one dimensional hydrodynamical model is derived, where phase transition from the QGP state to the hadronic state is effectively taken into account. The single particle rapidity distribution of charged π mesons observed in relativistic heavy ion collisions is analyzed by the model. Space-time development of the fluid is also investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.