Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree

ZHANG WeiGang

Chinese Physics C> 2000, Vol. 24> Issue(10) : 962-968

Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree

ZHANG WeiGang ^,

Dean's Office of Guangxi Institute of Technology, Liuzhou 545005, China

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Abstract：
Based on the concept of correlative degree, a new method of high-order collective-flow measurement is constructed in this paper, with which azimuthal correlations, correlations of final state transverse momentum magnitude and transverse correlations can be inspected respectively. Using the new method the contributions of the azimuthal correlations of particles distribution and the correlations of transverse momentum magnitude of final state particles to high-order collective-flow correlations are analyzed respectively with 4π experimental events for 1.2A GeV Ar+BaI₂ collisions at the Bevalac stream chamber. Comparing with the correlations of transverse momentum magnitude, the azimuthal correlations of final state particles distribution dominate high-order collective-flow correlations in this experimental samples. The contributions of correlations of transverse momentum magnitude of final state particles not only enhance the strength of the high-order correlations of particle group, but also provide important information for the measurement of the collectivity of collective flow within the more constraint district.

References

[1]

ZHANG WeiGang. Phys. Rev，1998, 058:35602 Barrette J et al. Phvs. Rev.，1997, 055:14203 WANG Shan et al. Phys. Rev. Left，1996, 76:39114 Beckmann P et al. Mod. Phys. Lett., 1987, A2:1635 LIU QingJun et al. High Energy Phys. and Nucl. Phys. (in Chinese)，1993, 17:912(刘庆军等.高能物理与核物理，1993,17:912)6 ZHANG WeiGang. Journal of Guangxi Institute of Technology, (in Chinese), 1994, 5;51(张伟刚.广西T学院学报，1994,5:51)7 WANG Shun et al. Phys. Rev.，1991. 044:10918 WANG Shan et al. High Energy Phys. and Nucl. Phys. (in Chinese), 1990. 14:907(王山等.高能物理与核物理，1990,14;907)9 J1ANG J et al. Phys. Kev. Lett.，1992, 68:273910 LIU YiMing et al. High Energy Phys. and Nucl. Phys.，1994, 18:16711 LIU YiMing et al. High Energy Phys. and Nucl. Phys.(in Chinese). 1994, 18:511(刘亦铭等.高能物理与核物理，1994,18:511)12 ZHANG WeiGang. High Energy Phys. and Nucl. Phys. ，1997, 21:6513 ZHANG WeiGang. High Energy Phys. and Nucl. Phys. (in Chinese), 1997, 21:911(张伟刚.高能物理与核物理，1997,21:911)14 ZHANG WeiGang. Guangxi Sciences(in Chinese)，1997, 4:251(张伟刚.广西科学，1997,4:251)15 ZHANG WeiGang. High Energy Phys. and Nucl. Phys. (in Chinese), 1999, 23:367(张伟刚.高能物理与核物理，1999,23:367)16 ZHANG WeiGang. Guangxi Sciencac (in Chinese), 1998, 4:264(张伟刚.广西科学，1998.4:264)17 ZHANG WeiGang. Journal of Guangxi University (Natural Science Edition) (in Chinese).1995. 20:325(张伟刚.广西大学学报(自然科学版),1995,20:325)18 ZHANG WeiGang. Journal of Guangxi University (Natural Science Edition) (in Chinese)，1997,22:124(张伟刚，广西大学学报(自然科学版),1997,22:124)

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ZHANG WeiGang. Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree[J]. Chinese Physics C, 2000, 24(10): 962-968.

ZHANG WeiGang. Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree[J]. Chinese Physics C, 2000, 24(10): 962-968. shu

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Received: 1999-08-02
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Analysis Method of High-Order Collective-Flow Correlations Based on the Concept of Correlative Degree

ZHANG WeiGang ^,

Corresponding author: ZHANG WeiGang,

Dean's Office of Guangxi Institute of Technology, Liuzhou 545005, China

Received Date: 1999-08-02
Accepted Date: 1900-01-01
Available Online: 2000-10-05

Abstract: Based on the concept of correlative degree, a new method of high-order collective-flow measurement is constructed in this paper, with which azimuthal correlations, correlations of final state transverse momentum magnitude and transverse correlations can be inspected respectively. Using the new method the contributions of the azimuthal correlations of particles distribution and the correlations of transverse momentum magnitude of final state particles to high-order collective-flow correlations are analyzed respectively with 4π experimental events for 1.2A GeV Ar+BaI₂ collisions at the Bevalac stream chamber. Comparing with the correlations of transverse momentum magnitude, the azimuthal correlations of final state particles distribution dominate high-order collective-flow correlations in this experimental samples. The contributions of correlations of transverse momentum magnitude of final state particles not only enhance the strength of the high-order correlations of particle group, but also provide important information for the measurement of the collectivity of collective flow within the more constraint district.