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28 March 2024
 
  » arxiv » nucl-th/0107056

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Transition to meson-dominated matter at RHIC. Consequences for kaon flow
L. Bravina ; L. Csernai ; Amand Faessler ; C. Fuchs ; E. Zabrodin ;
Date 20 Jul 2001
Journal Phys.Lett. B543 (2002) 217-226
Subject nucl-th hep-ph nucl-ex
Affiliation1,2), L. Csernai , Amand Faessler , C. Fuchs , E. Zabrodin (1,2) ( Institute for Theoretical Physics, University of Tuebingen, Germany; Institute for Nuclear Physics, Moscow State University, Russia; Department of Physics, University of Bergen, Norwa
AbstractAnisotropic flow of kaons and antikaons is studied in heavy-ion collisions at CERN SPS and BNL RHIC energies within the microscopic quark-gluon string model. In the midrapidity range the directed flow of kaons v_1 differs considerably from that of antikaons at SPS energy (E_{lab} = 160 AGeV), while at RHIC energy (sqrt{s} = 130 AGeV) the excitation functions of both, kaon and antikaon, flows coincide within the statistical error bars. The change is attributed to formation of dense meson-dominated matter at RHIC, where the differences in interaction cross-sections of kaons and antikaons become unimportant. The time evolution of the kaon anisotropic flow is also investigated. The elliptic flow of these hadrons is found to develop at midrapidity at times 3 < t < 10 fm/c, which is much larger than the nuclear passing time t^{pass} = 0.12 fm/c. As a function of transverse momentum the elliptic flow increases almost linearly with rising p_t. It stops to rise at p_t > 1.5 GeV/c reaching the saturation value $v_2^K (p_t) approx 10%$.
Source arXiv, nucl-th/0107056
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