Аннотация:The sigma meson exchange contribution to the potential of the
muon-proton interaction in muonic hydrogen induced by the -meson coupling
to two photons is estimated. The transition form factor is deduced from
the quark model and experimental data on the decay widths. It is shown that scalar meson exchange contribution to the Lamb shift in muonic hydrogen, ΔELs(2P−2S ), is rather large and relevant for a comparison with coming precise experimental data.