  Within the hadronic language of Chiral Perturbation Theory we present the
full leading-order octet-baryon$-$meson and decuplet-baryon$-$meson
contribution to the proton self energy and thus to its wave function
renormalization factor $Z$. By Fock-expanding the physical proton state into
its bare and hadron-cloud part, we show how each individual baryon-meson
probability depend on the average momenta of the particles in the fluctuation.
We present how the results depend on the choice of the form factor involved in
the regularization (Gaussian or Besselian) and how they depend on the cut-off
parameter. We also show how the results vary with respect to a variation of the
decuplet coupling constant $h_A$. The momentum distributions of the
fluctuations are given and the fluctuations' relative probabilities are
presented.
  We show that for reasonable values of the cut-off parameter, the Delta-pion
fluctuation is of the same strength as the nucleon-pion fluctuation.
