Differential Directed Flow of K+ Meson within Covariant Kaon Dynamics
XING Yong-Zhong1,2, ZHENG Yu-Ming2,3, SRISAWAD Pornrad4, YAN Yu-Peng5, KOBDAJ Chinorat5
1College of Physics and Information Technology, Shaanxi Normal University, Xi'an 7100622Department of Physics, Tianshui Normal University, Tianshui 7410003China Institute of Atomic Energy, PO Box 275(18), Beijing 1024134Department of Physics, Faculty of Science, Naresuan University, Amphoe Mueany, Phitsanulok 65000, Thailand5School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
Differential Directed Flow of K+ Meson within Covariant Kaon Dynamics
XING Yong-Zhong1,2, ZHENG Yu-Ming2,3, SRISAWAD Pornrad4, YAN Yu-Peng5, KOBDAJ Chinorat5
1College of Physics and Information Technology, Shaanxi Normal University, Xi'an 7100622Department of Physics, Tianshui Normal University, Tianshui 7410003China Institute of Atomic Energy, PO Box 275(18), Beijing 1024134Department of Physics, Faculty of Science, Naresuan University, Amphoe Mueany, Phitsanulok 65000, Thailand5School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
摘要The collective flow of positive charged kaons in heavy ion reactions at SIS energy is investigated within the frame of covariant kaon dynamics. The theoretical results calculated by using quantum molecular dynamics show that the rapidity distribution of K+ mesons is more sensitive to the nuclear equation of state than the differential directed flow. The contribution of various K+ production reaction channels to the rapidity distribution of the K+ is also analysed in detail. The results indicate that the rapidity distribution ofK+ mesons is mainly from the contribution of the N-Δ and N-N channel. This means that the delta resonance state plays a predominantly important role for the K+ subthreshold production..
Abstract：The collective flow of positive charged kaons in heavy ion reactions at SIS energy is investigated within the frame of covariant kaon dynamics. The theoretical results calculated by using quantum molecular dynamics show that the rapidity distribution of K+ mesons is more sensitive to the nuclear equation of state than the differential directed flow. The contribution of various K+ production reaction channels to the rapidity distribution of the K+ is also analysed in detail. The results indicate that the rapidity distribution ofK+ mesons is mainly from the contribution of the N-Δ and N-N channel. This means that the delta resonance state plays a predominantly important role for the K+ subthreshold production..
[1] Gyvlassy M et al 1982 Phys. lett. B 110 185 [2] Li B A, Andrew T S and Zhang B arXiv: nucl-th / 0108047v1 Shin G R arXiv: nucl-th / 0704.3479v1 Zhu X L, Bleicher M and Stocker H arXiv: nucl-th / 0509081v2 [3] Ko C M, Koch V and Li G Q 1997 Annu. Rev. Nucl. Part.Sci. 47 1 Fang X S, Ko C M, Li G Q and Zheng Y M 1994 Nucl.Phys. A 575 766 [4] Kaplan B D and Nelson A E 1986 Phys. Lett. B 175 57 [5] Li G Q, Lee C H and Brown G E 1997 Phys. Rev. Lett. 79 5214 [6] Ritman J L et al (FOPI Collaboration) 1995 Z. Phys.A 352 355 [7] Bratkovskay E L, Cassing W and Mosel U 1997 Nucl.Phys. A 622 593 Bratkovskay E L, Cassing W and Mosel U 1998 Phys.Lett. B 424 244 [8] Wang Z S, Faessler A Fuchs C, Maheswari V S U and KosovD S 1998 Nucl. Phys. A 628 151 [9] Li G Q, Ko C M and Li B A 1995 Phys. Rev. Lett. 74 235 Li G Q and Ko C M 1995 Nucl. Phys. A 594 460 [10] Fuchs C, Kosov D S, Faessler A, Wang Z S and Waindzoch T1998 Phys. Lett. B 434 245 [11] Zheng Y M, Fuchs C, Faessler A et al 2004 Phys.Rev. C 69 034907 [12] Herrmann H et al (FOPI Collaboration) 1999 Prog.Part. Nucl. Phys. 42 187 [13] Fuchs C Ariv: nucl-th/0507017 v2 [14] Fuchs C, Kosov D S, Faessler A, Wang Z S and Waindzoch T1998 Phys. Lett. B 434 245 Zheng Y M, Fuchs C, Faessler A, Shokhter K, Srisawad P,Kobdaj C and Yan Y P 2004 Commun. Theor. Phys. 41 746 [15] Hartnack C arXiv: nucl-th/0507002 v1 [16] Ollitrault J Y 1992 Phys. Rev. D 46 229 Zhang B, Gyulassy M and Ko C M arXiv: nucl-th/9902016 [17] Menzelet M et al (KaoS Collaboration) 2000 GSIAnnual Report 01 47 [18] Best D et al (FOPI Collaboration) 1997 Nucl. Phys.A 625 307 [19] Chu Z L, Zheng Y M, Sa B H and Lu Z D 1995 HighEnergy Phys. Nucl. Phys. 19 365 (in Chinese) [20] Crochet P et al (FOPI Collaboration) 2001 J. Phys.G 27 267 Crochet P et al (FOPI Collaboration) 2000 Phys. Lett.B 486 6 [21] Aichelin J and Hartnack C arXiv: nucl-th/0011050v1
2009, Vol. 26 
