Λ flow in heavy-ion collisions: The role of final-state interactions

Gq, Li; Ko, Che Ming

doi:10.1103/physrevc.54.1897

Cited by 36 publications

(24 citation statements)

References 39 publications

(47 reference statements)

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“…The tight interplay of experimental and and theoretical efforts revealed the importance of strangeness-exchange reactions for antikaon production (Y N →KN N ) and absorption (KN → Y π). Also Λ hyperons, being co-produced with kaons, are predicted to feel a weakly attractive potential (∼ −30 MeV) [22,23,24]. However, experimental data on the flow properties [25] and on spectral shapes [15,26,27] of hyperons produced in heavy-ion collisions near or below threshold are scarce.…”

Section: Introductionmentioning

confidence: 99%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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Abstract. Results on Λ hyperon production are reported for collisions of p (3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleonnucleon collisions, ycm = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The Λ phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for Λ production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing Λ polarization in the weak decay Λ → pπ − . Finite negative values of the polarization in the order of 5 − 20 % are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for pt > 300 MeV/c and increases with decreasing rapidity for y < 0.8. PACS.25.75.Dw, 25.75.Gz

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Section: Introductionmentioning

confidence: 99%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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“…Lambda flow was studied by Li and Ko in Ref. [37]. Indeed, quite different flow patterns were predicted for K + and Λ, because of their different mean-field potentials.…”

Section: Introductionmentioning

confidence: 99%

K+ versus Λ flow in relativistic heavy-ion collisions

Brown

1998

Nuclear Physics A

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We study K + and Λ flow in heavy-ion collisions at beam energies of about 2A GeV. We present our results in both the 'traditional' (i.e., in terms of the average transverse momentum in the reaction plane) as well as 'modern' (i.e., in terms of coefficients of the Fourier analysis of azimuthal distributions) methods of flow analysis. We find significant differences between the K + and the Λ flow: while the Λ flow is basically similar to that of nucleons, the K + flow almost disappears. This difference is attributed chiefly to their different mean field potentials in dense matter. The comparisons with the experimental data, as well as theoretical results from independent calculations, indicate clearly the pivotal roles of both K + and Λ medium effects. We emphasize that similar experimental data from independent collaborations are essential for the eventual verification of these medium effects. 25.75.Dw, 26.60.+c, 24.10.Lx

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“…We attribute this different reduction to a smaller directed Λ flow than proton flow (c.f. [18]). For (p, π + ) pairs ( Figs.…”

Section: Comparison Of Buu With the Experimental Datamentioning

confidence: 99%

(p,π±) correlations in central heavy-ion collisions at 1 ÷ 2 AGeV

Larionov

Cassing

Effenberger

et al. 2000

EPJ A

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The proton -charged pion correlated emission is studied in the reactions Au (1.06 AGeV) + Au, Ni (1.06 and 1.93 AGeV) + Ni and Ni (1.97 AGeV) + Cu within the BUU approach. The associated invariant mass distributions are shifted to smaller energies with respect to the free ∆(1232) mass distribution due to kinematical reasons. We find that the existing and partly conflicting experimental data do not allow to draw definite conclusions on the in-medium modification of the ∆(1232). PACS. 25.75.-q Relativistic heavy-ion collisions -25.75.Dw Particle and resonance production -25.75.Gz Particle correlations

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Λ flow in heavy-ion collisions: The role of final-state interactions

Cited by 36 publications

References 39 publications

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

K+ versus Λ flow in relativistic heavy-ion collisions

(p,π±) correlations in central heavy-ion collisions at 1 ÷ 2 AGeV

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