J/psi dissociation and Adler's theorem

Abstract

Effective Lagrangian models of charmonium have recently been used to estimate dissociation cross sections with light hadrons. Detailed study of the symmetry properties reveals possible shortcomings relative to chiral symmetry. We therefore propose a new Lagrangian and point out distinguishing features amongst the different approaches. Using the newly proposed Lagrangian, which exhibits SU_L(4) X SU_R(4) symmetry and complies with Adler's theorem, we find dissociation cross sections with pions that are reduced in an energy dependent way, with respect to cases where the theorem is not fulfilled.

Comments: 9 pages, 3 figures. To appear in the proceedings of the 27th Annual Montreal-Rochester-Syracuse-Toronto (MRST) conference on High-Energy Physics (MRST 2005), Utica, New York, 16-18 May 2005