Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

FENG Sheng-Qin; LIU Feng; LIU Lian-Shou

Chinese Physics C> 2002, Vol. 26> Issue(12) : 1277-1284

Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Abstract
HTML
Reference
Related

PDF

Abstract：
The non-uniform longitudinal flow model (NUFM) proposed recently is extended to include also the transverse flow. The resulting longitudinally non-uniform collective expansion model (NUCEM) is applied to the calculation of rapidity distribution of kaons, lambdas and protons in relativistic heavy ion collisions at CERN-SPS energies. The model results are compared with the 200A GeV/c S-S and 158 A GeV/c Pb-Pb collision data. The central dips observed in experiments are reproduced in a natural way. ;It is found that the depth of the central dip depends on the magnitude of the parameter e and the mass of produced particles, i.e. the non-uniformity of the longitudinal flow which is described by the parameter e determines the depth of the central dip for produced particles. Comparing with one-dimensional non-uniform longitudinal flow model, the rapidity distribution of lighter strange particle kaon also shows a dip due to the effect of transverse flow.

References

[1]

. Bass S A ,Gyulassy M ,St cker H et al.J.Phys.,1999,G25:R1—R57;Alber J et al.Phys.Rev.Lett.,1995,75:3814 2. Capella A ,Kopeliovich B Z .Phys.Lett.,1996,B381:325;Werner K .Phys.Rep.,1993,232:87 3. Lctessier J et al.Phys.Rev.,1995,D51:3408 4. Alber E et al(NA35 Collab.).Nucl.Phys.,1994,A566:35c;Bachler E et al(NA35 Collab.).Phys.Rev.Lett.,1994,72:1419 5. Appelshuser H et al(NA49 Collab.).Phys.Rev.Lett.,1998,80:41366. Schnedermann E ,Sollfrank J,Heinz U .Phys.Rev.,1993,C47:1738;1993,C48:2462;Schnedermann E ,Heinz U .Phys.Rev.,1994,C50:1675 7. Sollfrank J.Eur.Phys.J.,1999,C9:156;Slotta C ,SollfrankJ,HeinzU .1995 Strangenessin Hadronic Matter,AIPCon ference Proceedings 340(Wood bury:AIP process),4628. FENG ShengQin,LIU Feng,LIU LianShou.Phys.Rev.,2001,C63:014901 9. Werner K .Nucl.Phys.,1991,A525:501c;Werner K ,KochP .Phys.Lett.,1990,B242:251;Poskanzer A M ,Voloshin S A .Phys.Rev.,1998,C58:1671;Ollitrault J Y .Nucl.Phys.,1998,A638:195c 10. Gutbrod H H ,Poskanzer A M ,Ritter H G .Rep.Prog.Phys.,1989,52:1287;Gustaffson H A et al.Phys.Rev.Lett.,1984,53:1590;StckerH ,GreinerW .Phys.Rep.,1986,137:277 11. Abbott T et al.Phys.Rev.Lett.,1990,64:847;Barrette J et al(E877 Collab.).Phys.Rev.Lett.,1994,73:2543 12. Cooper H ,Frye G .Phys.Rev.,1974,D10:18613. Bjorken J D .Phys.Rev.,1983,D27:14014. Braun Munzinger P ,Stachel J,Wessels J P et al.Phys.Lett.,1995,B344:43;1996,B365:1;Braun Munzinger P ,Stachel J.Nucl.Phys.,1996,A606:320

[1]	S.Manly⁸ , B.Alver⁴ , B.B.Back¹ , M.D.Baker² , M.Ballintijn⁴ , D.S.Barton² , R.R.Betts⁶ , R.Bindel⁷ , W.Busza⁴ , Z.Chai² , V.Chetluru⁶ , E.Garcia⁶ , T.Gburek³ . Eccentricities of Flow-Elliptic Flow Fluctuations and Evidence for Transverse Localization in the Initial State of the Matter in Relativistic Heavy Ion Collisions. Chinese Physics C, 2007, 31(12): 1133-1136.
[2]	GAO Jian-Hua . Global Quark Polarization in QGP in Non-central AA Collisions. Chinese Physics C, 2007, 31(12): 1181-1184.
[3]	SHI Shu-Su , LIU Lian-Shou . A Monte Carlo Study on the Expansion of Hadronic Gas in Relativistic Heavy Ion Collisions. Chinese Physics C, 2007, 31(1): 56-58.
[4]	HUO Lei , ZHANG Wei-Ning , CHEN Xiang-Jun , ZHANG Jing-Bo , TANG Gui-Xin . Collective Flow and the Space-Momentum Correlation in High Energy Heavy Ion Collisions. Chinese Physics C, 2003, 27(1): 53-57.
[5]	ZHENG Yu-Ming , CHU Zi-Li , Fuchs Christian , Faessler Amand , XIAO Wu , HUA Da-Ping . Kaon Flow in Heavy-Ion Collisions. Chinese Physics C, 2002, 26(S1): 77-81.
[6]	HUO Lei , ZHANG Wei-Ning , CHEN Xiang-Jun , ZHANG Jing-Bo , TANG Gui-Xin . Anisotropic Transverse Flow in High Energy Heavy Ion Collisions. Chinese Physics C, 2001, 25(9): 865-871.
[7]	CHEN Xiao-Fan , CHEN Zhi-Lai , YANG Xue-Dong , LI Zhu-Peng . Distributions of Realative Momentum of Pion Pairs in Relativistic Heavy Ion Collisions. Chinese Physics C, 2001, 25(10): 1002-1005.
[8]	Lu Zhongdao , Ye Wei , Shen Wenqing . Collective Rotation Effect in Heavy Ion Collision and the Characteristics of Reaction. Chinese Physics C, 1999, 23(10): 1010-1014.
[9]	Chen Liewen , Zhang Fengshou , Zeng Xianghua , Jin Genming . Isospin Effects on Collective Flow in HIC at Intermediate Energies. Chinese Physics C, 1998, 22(11): 1035-1041.
[10]	Li Qingfeng , Li Zhuxia . Kaon Production and Flow in Relativistic Heavy-Ion Collisions. Chinese Physics C, 1998, 22(12): 1119-1127.
[11]	Zeng Xianghua , Ge Lingxiao . Thermalization,Expansion and Radial Flow in HIC. Chinese Physics C, 1997, 21(2): 157-161.
[12]	Zeng Xianghua , Ge Lingxiao . Studies of Radial Expansion Energy in HIC at Medium Energies. Chinese Physics C, 1996, 20(4): 345-349.
[13]	Zhuang Pengfei , Liu Lianshou . Linear Background and Nonlinear Effect in Relativistic Heavy Ion Collisions. Chinese Physics C, 1994, 18(2): 143-147.
[14]	YANG Fu-Zhong , LIU Jian-Ye . Impact Parameter and Bombarding Energy Dependence of Collective Flow in the Dynamics Process of Intermediate High Energy Heavy Ion Collision. Chinese Physics C, 1992, 16(8): 749-753.
[15]	ZHU Yun-Lun , ZHAO Wei-Qin , GAO Chong-Shou . Effect of Secondary Collisions on the K⁺/π⁺ Ratio in RHIC. Chinese Physics C, 1991, 15(7): 606-614.
[16]	GE Ling-Xiao , ZHANG Jian-Ming , ZHANG Feng-Shou , ZHUO Yi-Zhong . The Properties of Nuclear Collective Flow in the Intermediate and High Energy Heavy-ion Collisions. Chinese Physics C, 1991, 15(11): 1041-1048.
[17]	GE Ling-Xiao , ZENG Xiang-Hua , LIU Jian-Ye , ZENG Bao-Sheng . THE EFFECT OF COMPRESSION AND THERMAL EXCITATION FOR FRAGMENTATION DYNAMICS PROCESS OF HIC. Chinese Physics C, 1990, 14(3): 278-281.
[18]	LIU Yi-Ming , ZHANG Wei-Ning , WANG Shan , JIANG Yu-Zhen . TWO-PION INTERFEROMETRY FOR MULTI-PION EVENTS IN RELATIVISTIC HEAVY ION COLLISIONS. Chinese Physics C, 1990, 14(8): 724-730.
[19]	MIAO Bi-Xia , ZHAO Wei-Qin . DISTRIBUTIONS OF TRANSVERSE ENERGY AND ZERO-DEGREE ENERGY IN RELATIVISTIC HEAVY ION COLLISIONS. Chinese Physics C, 1989, 13(5): 470-475.
[20]	XU GONG-OU , WANG SHUN-JIN . THE CENERATOR COORDINATE METHOD AND NUCLEAR COLLECTIVE MOTIONS——V. THE RELATIVE TRANSLATIONAL MOTION IN HEAVY-ION COLLIONS. Chinese Physics C, 1982, 6(2): 243-246.

Access

Get Citation

FENG Sheng-Qin, LIU Feng and LIU Lian-Shou. Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions[J]. Chinese Physics C, 2002, 26(12): 1277-1284.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2002-01-30
Revised: 1900-01-01

Article Metric

Article Views(2753)
PDF Downloads(620)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

Corresponding author: FENG Sheng-Qin,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Received Date: 2002-01-30

Accepted Date: 1900-01-01

Available Online: 2002-12-05

Abstract: The non-uniform longitudinal flow model (NUFM) proposed recently is extended to include also the transverse flow. The resulting longitudinally non-uniform collective expansion model (NUCEM) is applied to the calculation of rapidity distribution of kaons, lambdas and protons in relativistic heavy ion collisions at CERN-SPS energies. The model results are compared with the 200A GeV/c S-S and 158 A GeV/c Pb-Pb collision data. The central dips observed in experiments are reproduced in a natural way. ;It is found that the depth of the central dip depends on the magnitude of the parameter e and the mass of produced particles, i.e. the non-uniformity of the longitudinal flow which is described by the parameter e determines the depth of the central dip for produced particles. Comparing with one-dimensional non-uniform longitudinal flow model, the rapidity distribution of lighter strange particle kaon also shows a dip due to the effect of transverse flow.

HTML

Reference (1)

Thermal Freeze-Out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article