Pornrad Srisawad Department of Physics, Naresuan University, Thailand Yu-Ming Zheng China Institute of Atomic Energy, Beijing China Azimuthal distributions.

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Presentation transcript:

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

10/9/ Free template from Introduction Introduction Kaons in dense matter Kaons in dense matter Kaon production in transport model Kaon production in transport model Probing in-medium kaon potential Probing in-medium kaon potential Summary Summary

10/9/ Free template from Introduction Kaons in dense hadronic matter are important 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. Extensive experimental efforts to search for the kaon in-medium potential in heavy ion collisions. The azimuthal distribution is one of sensitive The azimuthal distribution is one of sensitive observes to extract information on in-medium properties at high densities. observes to extract information on in-medium properties at high densities.

10/9/ Free template from

10/9/ Free template from Good probes for dense matter Kaons: Subthreshold Kaon production (E Lab < E thr ):

10/9/ Free template from The azimuthal distribution

10/9/ Free template from  Off plane : v 2 < 0  In – plane : v 2 > 0

10/9/ Free template from Dispersion relation : in-medium energy” Do kaons change their properties in dense matter?

10/9/ Free template from Density dependence of the in-medium kaon potential at zero momentum. IA: the impulse approximation [NPA 567 (1994) 937], BR potential KL potential

10/9/ Free template from Ratio of  (p+Au/p+C ) at T p = 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.

10/9/ Free template from 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)].

10/9/ Free template from Probing in-medium kaon potential Influence of in-medium K + potential on the kaon yields Influence of in-medium K + potential on the kaon yields for central (b=0) Au +Au and C + C reactions. [PPNP56(1)1] for central (b=0) Au +Au and C + C reactions. [PPNP56(1)1]

10/9/ Free template from 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) ].

10/9/ Free template from K + rapidity distributions in Ni + Ni reactions at 1.93 AGeV. Data are from FOPI [NPA625 (97) 307] and KaoS [PLB 495 (2000) 26].

10/9/ Free template from

10/9/ Free template from Au+Au at 1.5 A GeV data The azimuthal distribution K + Out of-plane Flow

10/9/ Free template from ExperimentdataCalculation with K + N Calculation without K + N transverse flow (v 1 ) 0.04± ± ± Elliptic flow v 2 v ± ± ±0.0013

10/9/ Free template from Ni+Ni at 1.93 A GeV data The azimuthal distribution

10/9/ Free template from ExperimetDataCalculation with K + N Calculation without K + N transverse flow (v 1 ) -0.01± ± ± Elliptic-flow (v 2 ) -0.05± ± ±0.0014

10/9/ Free template from 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.

10/9/ Free template from  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.

10/9/ Free template from