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Pornrad Srisawad Department of Physics, Naresuan University, Thailand Yu-Ming Zheng

Azimuthal distributions of K+ mesons in heavy-ion collisions. Pornrad Srisawad Department of Physics, Naresuan University, Thailand Yu-Ming Zheng China Institute of Atomic Energy, Beijing China. Introduction Kaons in dense matter Kaon production in transport model

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Pornrad Srisawad Department of Physics, Naresuan University, Thailand Yu-Ming Zheng

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  1. Azimuthal distributions of K+ mesons in heavy-ion collisions Pornrad Srisawad Department of Physics, Naresuan University, Thailand Yu-Ming Zheng China Institute of Atomic Energy, Beijing China

  2. Introduction • Kaons in dense matter • Kaon production in transport model • Probing in-medium kaon potential • Summary Free template from www.brainybetty.com

  3. Introduction • Kaons in dense hadronic matter are important • a possible restoration of chiral symmetry • the properties of nuclear matter at high densities and temperatures. • Extensive experimental efforts to search for the kaon in-medium potential in heavy ion collisions. • The azimuthal distribution is one of sensitive observes to extract information on in-medium properties at high densities. Free template from www.brainybetty.com

  4. Free template from www.brainybetty.com

  5. Good probes for dense matter Kaons: Subthreshold Kaon production (ELab< Ethr): Free template from www.brainybetty.com

  6. The azimuthal distribution Free template from www.brainybetty.com

  7. Off plane : v2 < 0 • In – plane : v2 > 0 Free template from www.brainybetty.com

  8. Do kaons change their properties in dense matter? in-medium energy” Dispersion relation : Free template from www.brainybetty.com

  9. BR potential KL potential Density dependence of the in-medium kaon potential at zero momentum. IA: the impulse approximation [NPA 567 (1994) 937], Free template from www.brainybetty.com

  10. Ratio of (p+Au/p+C ) at Tp = 2.3 GeV RBUU transport _ _ without Coulomb ._._ only Coulomb …. Coulomb + 20 MeV _.._.. Coulomb + 40 MeV o data __ Coulomb + 20 MeV Eur. Phy. J. A 22 (2004) 301. Phys. Lett. B 540 (2002) 207. Free template from www.brainybetty.com

  11. K+ In-plane Flow Transverse K+ flow in 1.93 AGeV Ni + Ni reactions at impact parameter b≤4 fm. Data are from FOPI [Z. Phys. A352(95)355 (old) and Prog. Part. Nucl. Phys. 42 (99) 187(new)]. Free template from www.brainybetty.com

  12. Probing in-medium kaon potential Influence of in-medium K+ potential on the kaon yields for central (b=0) Au +Au and C + C reactions. [PPNP56(1)1] Free template from www.brainybetty.com

  13. The K+ excitation functions in Au + Au (scaled by 10-1)and C + C reactions are compared to data from KaoS [PRL 82 (99) 1640); PRC 66 (02) 054604]. Free template from www.brainybetty.com

  14. K+ rapidity distributions in Ni + Ni reactions at 1.93 AGeV. Data are from FOPI [NPA625 (97) 307] and KaoS [PLB 495 (2000) 26]. Free template from www.brainybetty.com

  15. Free template from www.brainybetty.com

  16. K+ Out of-plane Flow Au+Au at 1.5 A GeV data The azimuthal distribution Free template from www.brainybetty.com

  17. Free template from www.brainybetty.com

  18. Ni+Ni at 1.93 A GeV data The azimuthal distribution Free template from www.brainybetty.com

  19. Free template from www.brainybetty.com

  20. Summary • K+ production can be used to probe the in-medium kaon potential, and consequently to probe an expected partial restoration of chiral symmetry at supra-normal nuclear densities. • Most transport simulations reproduce corresponding data only when in-medium potentials are included • The azimuthal distribution is one of sensitive observes to extract information on in-medium properties at high densities. Free template from www.brainybetty.com

  21. We have analyzed the azimuthal distributions of K+ mesons produced in Au+Au reactions at 1.5 A GeV and in Ni + Ni reactions at 1.93 A GeV within the QMD model. • Calculated results with a in-medium K+N potential can • reasonably describe the features of KaoS data.This indicates • that the azimuthal distribution is one of sensitive probes • to extract information on in-medium properties of K+ • mesons at high densitis. Free template from www.brainybetty.com

  22. Thank you for your attention Free template from www.brainybetty.com

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