Transversity quark distributions in a covariant quark-diquark model

Submitted to Cornell University’s online archive www.arXiv.org in 2007 by Ian Cloët. Post-print sourced from www.arxiv.orgTransversity quark light-cone momentum distributions are calculated for the nucleon. We utilize a modified Nambu--Jona-Lasinio model in which confinement is simulated by eliminating unphysical thresholds for nucleon decay into quarks. The nucleon bound state is obtained by solving the relativistic Faddeev equation in the quark-diquark approximation, where both scalar and axial-vector diquark channels are included. Particular attention is paid to comparing our results with the recent experimental extraction of the transversity distributions by Anselmino et al. We also compare our transversity results with earlier spin-independent and helicity quark distributions calculated in the same approach.I. C. Cloët, W. Bentz and A. W. Thoma