The study of low p_T particle production in nucleus-nucleus collisions is particularly interesting as it is associated with long-distance scales and could indicate new long-wavelength physics phenomena. Such measurements can provide critical information for testing the predictions of a recently proposed model [1] which incorporates chiral symmetry restoration to describe the properties of the dense medium created in heavy ion collisions at RHIC energies. The PHOBOS experiment has a unique capability of measuring charged particles down to very low p_T. The measurements reach p_T as low as 30 MeV/c for charged pions, 90 MeV/c for charged kaons and 140 MeV/c for protons and antiprotons. New results on low-p_T charged particle production are presented for the most central Au Au collisions and inclusive d Au data at sqrt(s_NN)=200 GeV and compared to measurements at higher p_T as well as to different model predictions. [1] J.G. Cramer, G.A. Miller, et al.,Phys.Rev.Lett.94,102302(2005).