Volume 90, Number 1, June 2010
|Number of page(s)||6|
|Published online||04 May 2010|
Influence of the Lorentz force on the centrality dependence of the kaon flow in heavy-ion collisions
Physics Department of Tianshui Normal University - Tianshui 741000, China
2 College of Physics and Information Technology, Shaanxi Normal University - Xi'an, 710062, China
3 China Institute of Atomic Energy - P.O. Box 275(18), Beijing 102413, China
4 Department of Physics, Faculty of Science, Naresuan University - Amphur Muang, Phitsanulok, 65000, Thailand
5 School of Physics, Institute of Science, Suranaree University of Technology - Muang District, Nakhon Ratchasima, 30000, Thailand
Corresponding author: email@example.com
Accepted: 24 March 2010
In this letter, the centrality dependence of the collective flow of K+-mesons in Ru+Ru reactions at incident energy E = 1.69 AGeV is studied by using the quantum-molecular-dynamics model within the covariant kaon dynamics. Our calculated results show that the Lorentz force derived from the covariant kaon dynamics obviously influences the features of the centrality dependence of the K+ flow in heavy-ion collisions at SIS energies. Without the Lorentz force, the smaller impact parameter gives the weaker in-plane flow and the stronger out-of-plane flow. If the Lorentz force is taken into account, the characteristic of the centrality dependence of v1 is appreciably reduced on the magnitude, and property of the centrality dependence of v2 is also reduced on the magnitude and even becomes to change its trend that the larger impact parameter gives the stronger out-of-plane flow. For the differential directed flow of K+, the same feature as the ones for the v1 is obtained. After taking into account the Lorentz force, the theoretical results are considerably reduced, leading to reasonably reproduce the experimental data. This means that the Lorentz force in the covariant kaon dynamics plays an important role in the determination of the collective flow of kaons.
PACS: 25.75.Ld – Collective flow / 24.10.Jv – Relativistic models / 25.75.Dw – Particle and resonance production
© EPLA, 2010
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