The quark degrees of freedom in high energy composite particle scattering

A hybrid quark hadron model is proposed to describe high energy composite particle scattering. The parameters for quark sector in the model are determined by fitting pp scattering data. The model without any free parameter is applied to proton-alpha elastic scattering. It yields a quite large improvement over various calculations done before and provides a very good agreement with existing data available. The results also show that the quark degrees of freedom in NN interaction play an important role in improving theoretical description of experimental data and must be included in future calculations