Where is the diamagnetism of the nucleon?
 
 
 

The problem of the missing diamagnetism of the nucleon
is discussed from the view point of the constituent quark model,
dispersion relations, chiral perturbation theory, and the
quark-level linear sigma model.
It is argued that the pion cloud of the nucleon is not sufficient
to compensate a large paramagnetic contribution from the Delta isobar
and that there are other large effects related with the electromagnetic
susceptibility of the quark vacuum in the nucleon.
An evidence for such effects in the recent experiment LARA
is briefly discussed.