Abstract
A novel approach that allows access to long-sought information on the Hyperon-Nucleon (YN) interaction was developed by producing a hyperon beam within a few-body nuclear system, and studying final-state interactions. The determination of polarisation observables, and specifically the beam spin asymmetry, in exclusive reactions allows a detailed study of the various final-state interactions and provides us with the tools needed to isolate kinematic regimes where the YN interaction dominates. High-statistics data collected using the CLAS detector housed in Hall-B of the Thomas Jefferson laboratory allows us to obtain a large set of polarisation observables and place stringent constraints on the underlying dynamics of the YN interaction.
Highlights
One of the main goal of nuclear physics is to obtain a comprehensive picture of the strong interaction, which can be accessed by introducing the strangeness degree of freedom in the, well-understood, nucleon-nucleon (N N ) interaction
Final state interactions in exclusive hyperon photoproduction reactions off deuterium impart an excellent tool to study the bare Y N interaction in an approach that is free from medium modifications and many-body effects
And circularly polarised photon beams in combination with the selfanalyticity of hyperons give access to a large set of polarisation observables that are crucial for constraining the dynamics of the Y N interaction
Summary
One of the main goal of nuclear physics is to obtain a comprehensive picture of the strong interaction, which can be accessed by introducing the strangeness degree of freedom in the, well-understood, nucleon-nucleon (N N ) interaction. The interaction between Hyperons (hadrons with one or more strange quarks) and Nucleons (Y N ) is very poorly constrained, mainly due to difficulties associated with performing high-precision scattering experiments involving short-lived hyperon beams Because of these difficulties, complimentary approaches, including studies of hypernuclei and final-state interaction (FSI), have been developed to provide indirect access to information on the hyperon-nucleon interaction. And circularly polarised photon beams in combination with the selfanalyticity of hyperons give access to a large set of polarisation observables that are crucial for constraining the dynamics of the Y N interaction This is illustrated by the most comprehensive model for this reaction, which uses two Y N potentials (Nijmegen NSC89 and NSC97f – both of which correctly predict the hypertrition binding energy) [3] and provides calculations of the polarised differential cross section, allowing predictions for a set of polarisation observables. The beam-spin asymmetry, Σ, is a critical observable that allows direct insight on contributions from the different FSI
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