The contribution of the anomalous quark-gluon interaction induced by instantons to the polarized and unpolarized gluon distributions in nucleon is estimated. It is shown that this interaction leads to negative gluon polarization in nucleon.

We show how the renormalization group is used to construct a lowmomentum nucleon-nucleon interaction Vlow k, which unifies all potential models used in nuclear structure calculations. Vlow k can be directly applied to the nuclear shell model or to nucleonic matter without a G matrix resummation. It is argued that Vlow k parameterizes a high-order chiral effective field theory two-nucleon force....

Our present understanding of the AS=O hadronic weak interaction is based on a collection of high precision experiments in the two-nucleon system and light nuclei, which isolate the weak interaction via its parity-violating signature. The weak nucleon-nucleon interaction at low and intermediate energies is described in terms of a meson exchange model involving n, p and W mesons, with one strong ...

We summarise measurements of the COSY-11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the proton-proton interaction. The results are discussed in the context of the meson-nucleon and hyperon-nucleon interactions. We conclude that the η-proton interaction is significantly stronger than the η′-proton interaction. Similarly, we found that...

We clarify under what circumstances the nucleon–nucleon final state interaction fixes the energy dependence of the total cross–section for the reaction NN → NNx close to production threshold, where x can be any meson whose interaction with the nucleon is not too strong. We strongly criticize the procedure used recently by several authors to include the final state interaction in the reactions u...