Lambda collective flow in heavy ion reactions

Abstract

Collective flow of Lambda hyperons in heavy ion reactions at SIS energies is investigated. It is found that a $\Lambda$ mean field constructed on the basis of the quark model leads to a good description of the experimental data of the in-plane transverse flow of $\Lambda$'s. The attractive mean field can also give rise to an additional "virtual" $\Lambda$ radial flow directed inwards, which is reflected by a "concave" structure of the transverse mass spectrum of the $\Lambda$ hyperons emitted at midrapidity. The $\Lambda$ radial flow is found to exhibit a strong mass dependence: The flow is visible in the Ni+Ni system, but is strongly reduced in the system of Au on Au.

18 pages LeTex, using Elsevier style, 6 PS-figures, accepted for publication in Nuclear Physics A

References in corpus (9)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• An Effective Equation of State for Dense Matter with Strangeness
• Consequences of covariant kaon dynamics in heavy ion collisions
• Origin of subthreshold K^+ production in heavy ion collisions
• Onset of Nuclear Matter Expansion in Au+Au Collisions
• K^+ versus Λflow in relativistic heavy-ion collisions
• Role of the Coulomb interaction in the flow and the azimuthal distribution of kaons from heavy ion reactions
• Nuclear Matter Expansion Parameters from the Measurement of Differential Multiplicities for Lambda Production in Central Au+Au Collisions at AGS
• Radial flow of kaon mesons in heavy ion reactions

Cited by in corpus (12)

• Nucleon and hadron structure changes in the nuclear medium and impact on observables
• Effect of tensor couplings in a relativistic Hartree approach for finite nuclei
• Elliptic flow in heavy ion collisions near the balance energy
• The Present and Future of QCD
• K^0 and Λproduction in Ni + Ni collisions near threshold
• Directed Flow of $\Lambda$-Hyperons in 2-6 AGeV Au+Au Collisions
• Lambda hyperon production and polarization in collisions of p(3.5 GeV) + Nb
• Medium effects on the flow of strange particles in heavy ion collisions
• Covariant kaon dynamics and kaon flow in heavy ion collisions
• Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energies
• The nuclear equation of state probed by $K^{+}$ production in heavy ion collisions
• Strangeness production in heavy ion reactions at intermediate energies