  In this work we present a new model for the form factor of a star polymer
consisting of self-avoiding branches. This new model incorporates excluded
volume effects and is derived from the two point correlation function for a
star polymer.. We compare this model to small angle neutron scattering (SANS)
measurements from polystyrene (PS) stars immersed in a good solvent,
tetrahydrofuran (THF). It is shown that this model provides a good description
of the scattering signature originating from the excluded volume effect and it
explicitly elucidates the connection between the global conformation of a star
polymer and the local stiffness of its constituent branch.
