is used and the problem of large nucleon mass disappears.

The meson propagator in Eq. (\[a3\]) is chosen to make the multiple scattering equation (\[a8\]) equivalent to a differential equation $$\label{a14}
 [ -  \Delta  +  \sum_i ~ 2\mu_{KN}~ V_{ KN_i }~]~\chi  = p(r)^2$$ and the contracting potential becomes $V_{K}= p(r)^2/ 2\mu_{KN}$ . The advantage of this choice is discussed in the next section.

Schrödinger equation 
---------------------

The solution of the full KNN bound state problem is given by equation $$\label{s15}
 ( - \frac{\Delta_x}{2m}  - \frac{\Delta_1}{2M}- \frac{\Delta_2}{2 M} +  V_{KN1}+V_{KN2}+ V_{NN} ) \Psi = E \Psi.$$ The wave function is assumed in the form $\Psi= \chi_K(x,x_i) \chi_{NN}(r)$ as given in Eq. (\[a2\]). Multiplying Eq. (\[s15\]) on the left by $ \chi_K$ and integrating over the meson coordinate $x$ one obtains the Schrödinger equation for the NN wave function $$\label{s16}
 \chi_{NN} (r) = \int \textbf{dx } \chi_K( x,x_i) \Psi (x,x_i)$$ in the form $$\label{s17}
 [ E -  V_K(r) +   \Delta_1 / 2 M +  \Delta_2 / 2 M  - V_{NN}]~\chi_{NN}  + \Delta E_{kin} \chi_{NN} =
 0.$$ where the last term $\Delta E_{kin}$ is a correction to the kinetic energies. This correction is small due to the choice of the meson kinetic energies. 