Abstract
Roles of the quark structure of baryons and mesons in hypernuclear physics are reviewed. Quark cluster model is employed to describe short-range part of hyperon-nucleon and hyperon-hyperon interactions. Important contributions of instanton induced interactions are stressed. New decay modes of Λ, ΛN → NN , in hypernuclei are studied. Direct quark mechanism is introduced and possibility of breaking the ∆I =1 /2 rule is discussed. §1. Why are we interested in strangeness? In 2003, we celebrated the 50th anniversary of the discovery of the hypernucleus. The physics of strange hadrons and nuclei has flourished during these 50 years. The year 2003 is also marked by discoveries of the pentaquark and other narrow (exotic) hadrons with heavy quarks. It is quite timely, therefore, to summarize achievements in strangeness hadron physics to this date and reveal unsolved problems. That is the main purpose of the 18th Nishinomiya-Yukawa Memorial Symposium on “Strangeness in Nuclear Matter”. 1)
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