THEORY CENTER SEMINAR Monday, Oct. 29, 2012 1:00 p.m. (coffee at 12:45 p.m.) CEBAF Center, Room L102 John Collins Penn State New Definition of TMD Parton Densities I give an account of a new definition of transverse-momentum-dependent parton densities. The new definition solves a number of difficulties and inconsistencies in earlier definitions.