Probing of nucleon mesonic structure by means of quasi-elastic knock-out processes like $p+e\to e^{\prime }+\pi +n$

V. G. Neudatchin, I. T. Obukhovsky, N. P. Yudin

The momentum distributions of pions and $\rho$-mesons in the nucleon are extracted from experiment. Perspectives of the quark microscopic theory of mesonic cloud are outlined.