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ΛΛ interaction from relativistic heavy-ion collisions

Kenji Morita, Takenori Furumoto, and Akira Ohnishi
Phys. Rev. C 91, 024916 – Published 26 February 2015

Abstract

We investigate the two-particle intensity correlation function of Λ in relativistic heavy-ion collisions. We find that the behavior of the ΛΛ correlation function at small relative momenta is fairly sensitive to the interaction potential and collective flows. By comparing the results of different source functions and potentials, we explore the effect of intrinsic collective motions on the correlation function. We find that the recent STAR data give a strong constraint on the scattering length and effective range of ΛΛ interaction, as 1.8fm1<1/a0<0.8fm1 and 3.5fm<reff<7fm, respectively, if Λ samples do not include the feed-down contribution from long-lived particles. We find that the feed-down correction for Σ0 decay reduces the sensitivity of the correlation function to the detail of the ΛΛ interaction. As a result, we obtain a weaker constraint, 1/a0<0.8 fm1. Implication for the signal of existence of H-dibaryon is discussed. Comparison with the scattering parameters obtained from the double Λ hypernucleus may reveal in-medium effects in the ΛΛ interaction.

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  • Received 29 August 2014
  • Revised 27 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.024916

©2015 American Physical Society

Authors & Affiliations

Kenji Morita1,2,3,*, Takenori Furumoto4, and Akira Ohnishi1,†

  • 1Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, D-60438 Frankfurt am Main, Germany
  • 3Institute of Theoretical Physics, University of Wroclaw, PL-50204 Wrocław, Poland
  • 4National Institute of Technology, Ichinoseki College, Ichinoseki, Iwate 021-8511, Japan

  • *kmorita@yukawa.kyoto-u.ac.jp
  • ohnishi@yukawa.kyoto-u.ac.jp

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Issue

Vol. 91, Iss. 2 — February 2015

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