Communications in Theoretical Physics

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Influence of Chiral Mean Field on Kaon In-plane Flow in Heavy Ion Collisions

ZHENG Yu-Ming,1,2,3 FUCHS Christian,4 FAESSLER Amand,4 SHEKHTER Kirril,4 SRISAWAD Pornrad,5 KOBDAJ Chinorat,5 and YAN Yu-Peng5   


  1. 1 China Institute of Atomic Energy, P.O. Box 275(18), Beijing 102413, China
    2 CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China
    3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China
    4 Institut für Theoretische Physik der Universität Tübingen, D-72076 Tübingen, Germany
    5 School of Physics, Suranarre University of Technology, Nakhon Ratchasima 30000, Thailand
  • Received: 2003-08-08 Revised: 1900-01-01 Published: 2004-05-15

Abstract: The influence of the chiral mean field on the K+ in-plane flow in heavy ion collisions at SIS energy is investigated within covariant kaon dynamics. For the kaon mesons inside the nuclear medium a quasi-particle picture including scalar and vector fields is adopted and compared to the standard treatment with a static potential. It is confirmed that a Lorentz force from spatial component of the vector field provides an important contribution to the in-medium kaon dynamics and strongly counterbalances the influence of the vector potential on the K+ in-plane flow. The calculated results show that the new FOPI data can be reasonably described using the Brown & Rho parametrization, which partly takes into account the correction of higher order contributions in the chiral expansion. This indicates that one can abstract the information on the kaon potential in a nuclear medium from the analysis of the K+ in-plane flow.

Key words: kaon in-plane flow, kaon mean field, covariant kaon dynamics, heavy ion collision

PACS numbers: 

  • 25.75.+r