An introduction to the quark model

Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook
Chromomagnetic binding
Namely attractive and
〈O〉H = 3 〈O〉Λ ,
Thus with Λ = N = ΣΞ all receiving 150 MeV of attraction from
spin-spin
He deduced that H is bound by about 150 MeV below the
degenerate threshold ΛΛ = NΞ = ΣΣ,
More than 20 experiments looked at the H
No positive signal, in particular from S = −2 hypernuclei
Chromomagnetism is remarkable, as it induces a net excess of
attraction in the Hamiltonian, before considering any induced
polarisation in sub-clusters,
The usual situation is: no excess of attraction
For instance Ps2 vs. 2 (e + e − ), both governed by gij/rij, both
have the same gij = −2
JMR Quark Model