Transversity distributions in the nucleon in the large-N-c limit

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Schweitzer, P (Autor) Outra; Diana Urbano (Autor) FEUP; Polyakov, MV (Autor) Outra; Weiss, C (Autor) Outra; Pobylitsa, PV (Autor) Outra; Goeke, K (Autor) Outra

Revista

Título: Physical Review D: Particles and fields

Vol. 64

ISSN: 0556-2821

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 85 Citações

Scopus - 89 Citações

Outras Informações

ID Authenticus: P-000-TVF

DOI: 10.1103/physrevd.64.034013

Abstract (EN): We compute the quark and antiquark transversity distributions in the nucleon at a low normalization point (mu approximate to 600 MeV) in the large-N-c limit, where the nucleon can be described as a soliton of an effective chiral theory (chiral quark-soliton model). The flavor-nonsinglet distributions deltau(x)-deltad(x) and delta(u) over bar (x)-delta(d) over bar (x) appear in leading order of the 1/N-c expansion, while the flavor-singlet distributions deltau(x)+deltad(x) and delta(u) over bar (x) + delta(d) over bar (x) are nonzero only in next-to-leading order. The transversity quark and antiquark distributions are found to be significantly different from the longitudinally polarized distributions Deltau(x) +/-Deltad(x) and Delta(u) over bar (x) +/-Delta(d) over bar (x), respectively, in contrast with the prediction of the naive nonrelativistic quark model. We show that this affects the predictions for the spin asymmetries in Drell-Yan pair production in transversely polarized pp and p (p) over bar collisions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 22