Abstract
Stopped antiproton annihilation can initiate an effcient chain of reactions to produce Ξ hyperons in recoil free kinematics, suitable for further investigations of ΞN interactions. Four delayed decays and presence of eight charged particles in the final state provide a clean reaction signature and allow for usage of a non-magnetic detection system. With the low energy phase space cooled antiproton beam from ELENA at the CERN AD or future FLAIR facility the realisation of this experiment would become possible. In this article the foreseen detector setup and the experimental program will be presented.
Highlights
The Ξ production proceeds via a double strangeness exchange reaction (s, s) induced by a secondary K− beam, e.g. K− p → Ξ−K+ [3]. In this case Ξ production in recoil-free kinematics is not feasible since the mass of K− is too low and a secondary target would be needed for the Ξ to undergo hadronic interactions
The production of S = −2 systems proceeds in a second step via the double strangeness and charge exchange reaction (K∗, K)
A reaction chain resulting in the production of a Ξ hyperon with a low recoil momentum down to zero MeV/c enabling investigations of ΞN interactions was proposed based on ideas already proposed for LEAR [4]
Summary
The experimental determination of the baryon-baryon interaction within the baryon octett allows for development of improved hyperon-nucleon potentials and investigation of SU(3) flavor symmetry. The Ξ production proceeds via a double strangeness exchange reaction (s, s) induced by a secondary K− beam, e.g. K− p → Ξ−K+ [3]. In this case Ξ production in recoil-free kinematics is not feasible since the mass of K− is too low and a secondary target would be needed for the Ξ to undergo hadronic interactions. The production of S = −2 systems proceeds in a second step via the double strangeness and charge exchange reaction (K∗, K). The first step of the studies would be the investigation of the branching ratio of the Ξ production in the stopped pannihilation in a deuteron target. For the further study of ΞN systems interaction, a 3He target is needed
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