NUCLEAR PHYSICS |
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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 |
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Cite this article: |
XING Yong-Zhong, ZHENG Yu-Ming, SRISAWAD Pornrad et al 2009 Chin. Phys. Lett. 26 022501 |
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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..
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Keywords:
25.75.Ld
24.10.Jv
25.75.Dw
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Received: 28 August 2008
Published: 20 January 2009
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