  We propose a new heavy pentaquark chiral perturbation theory for the recently
observed hidden-charm pentaquark states by LHCb Collaboration. With the ab
initio constructed chiral Lagrangians, we present a parameter-free calculation
of the octet molecular pentaquark magnetic moments up to one-loop level. We
improve the quark model description of the data when we include the leading
SU(3) breaking effects coming from the one-loop corrections. Without any
experimental inputs, our predictions are so simple and unique that we regard
them as a theoretical benchmark to be compared with experiments as well as
other theoretical models.
