Understanding the proton spin “puzzle ” with a new “minimal ” quark model (2002)

Content Provider	CiteSeerX
Author	Bo-Qiang Ma, A. Jian-Jun Yang, B. Ivan Schmidt, B.
Abstract	We investigate the spin structure of the nucleon in an extended Jaffe-Lipkin quark model. In addition to the conventional 3q structure, different (3q)(Q ¯ Q) admixtures in the nucleon wavefunction are also taken into account. The contributions to the nucleon spin from various components of the nucleon wavefunction are discussed. The effect due to the Melosh-Wigner rotation is also studied. It is shown that the Jaffe-Lipkin term is only important when antiquarks are negatively polarized. We arrive at a new “minimal ” quark model, which is close to the naive quark model, in order to understand the proton spin “puzzle”.
File Format	PDF
Publisher Date	2002-01-01
Access Restriction	Open
Subject Keyword	Proton Spin Puzzle Melosh-wigner Rotation Nucleon Wavefunction New Minimal Quark Model Extended Jaffe-lipkin Quark Model Various Component Naive Quark Model Nucleon Spin Jaffe-lipkin Term Spin Structure
Content Type	Text