Abstract
We study the production of the doubly strange Ξ baryon in subthreshold p + A collisions using a BUU type transport model. We propose a new mechanism for Ξ creation in a two-step process via hyperon-nucleon collisions. We study the influence of the anisotropy of hyperon production in N + N collisions on the Ξ multiplicity. Applying reasonable assumptions on the unknown elementary cross sections, we are able to reconstruct the Ξ yield observed by the HADES collaboration (GSI, Darmstadt) in subthreshold p+Nb collisions.
Highlights
Particle production in nuclear collisions near or below the kinematical threshold of elementary N + N reactions is sensitive to the details of the reaction dynamics, e.g. Fermi motion, collision of secondaries or in-medium modification of particle properties
We have proposed a new mechanism for the production of the doubly strange Ξ baryon in subthreshold proton-nucleus collisions via a reaction of a secondary Λ or Σ hyperon with a target nucle√on
We implemented this mechanism in our BUU transport code and studied the reaction p+Nb at sNN = 3.2 GeV energy, which has been measured by the HADES collaboration
Summary
Particle production in nuclear collisions near or below the kinematical threshold of elementary N + N reactions is sensitive to the details of the reaction dynamics, e.g. Fermi motion, collision of secondaries or in-medium modification of particle properties. Subthreshold strangeness production is a suitable tool to study the reaction dynamics at higher energies where higher baryon densities are reached. At present only the UrQMD transport model is able to reproduce the Ξ multiplicities found by HADES in subthreshold p+Nb and Ar+KCl reactions [4]. In the present contribution we propose a new production mechanism of the Ξ baryon in nuclear collisions via the collision of a secondary hyperon and a target nucleon. BUU transport calculations are presented in Sec. 3, where our results are compared to the HADES data
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