Abstract
The sea-quark contents such as s ̄ s, c ̄ c, b ̄ b… of the low-lying baryons in the octet and decuplet are calculated with a combined use of the trace anomaly of QCD and a chiral quark model. We find (i) the empirical value of the π-N sigma term(45 MeV) can be reproduced with a rather small s ̄ s content of nucleon consistently with the Gell-Mann-Okubo mass formula, (ii) the probability to find a charm quark in nucleon is found to be 0.5% which is consistent with the experimental analysis of the charm structure function of the proton and is necessary to account for the J/ ϕ-production in proton-nucleous collisions and (iii) both strange and heavy quarks are equally important for the Higgs-nucleon coupling. The heavy-quark and gluon contents of pion and kaon are briefly mentioned.
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