Importance of the meson cloud to hadron structure

摘要: Abstract We present a review of our recent results on the role mesonic cloud in structure hadrons both soft and hard kinematical regimes. compute pion nucleon form factors scalar operator u + d within meson exchange model. Our agree with dispersion relation analyses near Cheng-Dashen point but show some deviation at higher energies. In particular, we confirm observation that strong ππ interaction gives rise to square radius 1.5 fm2 15 MeV contribution sigma term. Some aspects around for deep-inelastic lepton scattering are studied framework Sullivan formalism. simple two-phase model nucleon. Renormalization valence quark distribution due is taken into account explicitly. study dependence different quantities cut-off parameter factor, mesons scattering, SU(2)F symmetry breaking sea connection Gottfried Sum Rule. It possible obtain agreement CCFR data using relatively meson-N-N factors. The E615 ( )/2 − s restrict dipole factor about 1.2 GeV. For this value get largest violation Rule, half observed by NMC. Mesonic models predict SU (2) which seems be necessary explain Since up now there no consensus concerning explanation NMC effect, one has / asymmetry may play other processes. Here effect Drell-Yan find careful analysis dilepton production p-p p-n collisions should shed new light interesting problem asymmetry. discuss also proton-nucleus moderate asymmetries concentrated small-x region not excluded E772 experimental data.