Gluonic Pole Matrix Elements in Spectator Models
arXiv:0808.2374 · doi:10.1142/9789814277785_0031
Abstract
We investigate the gluonic pole matrix element contributing to the first $p_T$ moment of the distribution and fragmentation functions in a spectator model. By performing a spectral analysis, we find that for a large class of spectator models, the contribution of gluonic pole matrix elements is non-zero for the distribution correlators, whereas in fragmentation correlators they vanish. This outcome is important in the study of universality for fragmentation functions.
Talk given by A. Mukherjee at Transversity 2008, Ferrara, Italy