Chinese Physics C > 1992, Vol. 16 > Issue(S4): 439-448

Multi-Pion Correlations in Two-Pion Interferometry

1 Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang, China;
2 Departmcnt of Physics, Kent State University, Kent, Ohio 44242, USA;
3 Department of Physics, University of California, Riverside, CA 92521, USA

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Abstract：
The influence ofmulti-pion correlations on two-pion interferometry analyses in multi-pion events can be expressed as the ratio of a multi-pion correlation factor for the sample of like-pion pairs to a residual correlation factor for the reference sample. Although these two correlation factors can partially cancel each other in data analyses, the difference between the two factors in the low relative momentum region is so large that the distortion from multi-pion interference becomes a serious problem when the pion source has a small radius and the pion multiplicity is high. The distributions of the multi-pion correlation factor C _n-2( q) offers a good sensitivity to multi-pion correlation effects. Analyses of the multi-pion correlation factor for two Bevalac streamer chamber data samples of 2.1 AGeV Ne + Pb and 1.8 AGeV Ar + Pb collisions show that the multi-pion correlation effect in the former sample is greater than that in the latter.

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Zhang Weining, Jiang Yuzhen, Wang Shan, Liu Yiming, D. Keane, J. Jiang, Y. Shao, S. Y. Fung and S. Y. Chu. Multi-Pion Correlations in Two-Pion Interferometry[J]. Chinese Physics C, 1992, 16(S4): 439-448.

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Received: 1992-01-07

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Supported in part by the National Natural Science Foundation of China, the US National Science Foundation, and the Doctorate Program of High Education of China.

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沈阳化工大学材料科学与工程学院沈阳 110142

Multi-Pion Correlations in Two-Pion Interferometry

1 Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang, China;
2 Departmcnt of Physics, Kent State University, Kent, Ohio 44242, USA;
3 Department of Physics, University of California, Riverside, CA 92521, USA

Received Date:1992-01-07

Fund Project:Supported in part by the National Natural Science Foundation of China, the US National Science Foundation, and the Doctorate Program of High Education of China.

Abstract:The influence ofmulti-pion correlations on two-pion interferometry analyses in multi-pion events can be expressed as the ratio of a multi-pion correlation factor for the sample of like-pion pairs to a residual correlation factor for the reference sample. Although these two correlation factors can partially cancel each other in data analyses, the difference between the two factors in the low relative momentum region is so large that the distortion from multi-pion interference becomes a serious problem when the pion source has a small radius and the pion multiplicity is high. The distributions of the multi-pion correlation factorC_n-2(q) offers a good sensitivity to multi-pion correlation effects. Analyses of the multi-pion correlation factor for two Bevalac streamer chamber data samples of 2.1AGeV Ne + Pb and 1.8AGeV Ar + Pb collisions show that the multi-pion correlation effect in the former sample is greater than that in the latter.