Abstract
The Hades spectrometer is a versatile detector device operating at the SIS18 synchrotron at GSI Darmstadt with a vital list of results on strangeness production including Λ(1405) and Σ(1385) exclusive production cross-sections, Λ polarization, Λ-p correlation and Kaons in-medium. With the upgrade of the SIS18 synchrotron for the FAIR facility and the upgrade of HADES with a new Forward Detector, the experiment will have an unique opportunity to study also excited hyperon states. Among others, production and electromagnetic decays of excited Λ and Σ hyperons states, Ξ− cascade spectroscopy and - production and correlation are planned. We have studied the reconstruction feasibility using two benchmark channels of Λ(1520) → Λe+e− Dalitz decay and exclusive Ξ− production in pp→Ξ−K+K+p reaction. The Forward Detector consisting of a forward tracker made of PANDA straw tubes prototypes and a RPC time of flight detector will enlarge HADES acceptance to forward angles (0.5-7°), important for Λ tagging. The magnetic field-free forward region will require employment of kinematical refit and neural networks analysis methods to perform particle identification. In this contribution highlights of strangeness production in p-p and p-A reactions will be presented together with perspectives for the future hyperon programme.
Highlights
HADES (High A cceptance DiElectron Spectrom eter) [1] is a m agnetic spectrom eter detector operating since 2002 at the SIS18 synchrotron in GSI Helmholtz Institute for Heavy Ion Research in Darm stadt (G erm any)
Results obtained in the last ten years by HADES showed that baryonic resonances, seen as excitation o f bare nucleons, play a fundamental role in the processes that define the physics at finite baryonic densities and are important sources o f meson production at these energies, that one can speak about a “resonance matter” emerging from heavy ion collisions at kinetic energies o f few GeV
Starting from 2025, HADES will operate within the new experimental facility o f FAIR, allowing to measure various reactions with beam energies up to 10G eV, a region where the resonance dominated production of the matter changes into string fragmentation
Summary
Status and perspectives of hyperon production and electromagnetic decays with HADES at FAIR. W ith the upgrade o f the SIS18 synchrotron for the FAIR facility and the upgrade of HADES with a new Forward Detector, the experiment will have an unique opportunity to study excited hyperon states. Production and electromagnetic decays of excited A and E hyperons states, S - cascade spectroscopy and A-A production and correlation are planned. The magnetic field-free forward region will require employment of kinematical refit and neural networks analysis methods to perform particle identification. In this contribution highlights of strangeness production in p-p and p-A reactions will be presented together with perspectives for the future hyperon programme
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