Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-04-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, no figures
Scientific paper
Color confinement and chiral symmetry specify some important territory for the study of hadronic physics. Any hadron can be defined as a color-singlet composite system of qurks and gluons, the fundamental fields of qcd, while the landscape of the hadronic spectrum is dominated by the fact that two quark flavors, u and d, are characterized by masses small compared to the fundamental scale of this theory. Measurements sensitive to the orbital angular momenta of the color constituents of the nucleon display the interplay of chiral dynamics and confinement in a unique manner. This pageant can be explored by an evaluation, within the context of the Georgi-Manohar chiral quark model, of the normalization of the orbital structure functions and the normalization of the Boer-Mulders functions for different quark flavors. The resolution structures in the chiral quark model represent an evaluation of Collins functions for a confined system defined by the quantum numbers of the nucleon in the constituent quark model. The orbital structure functions for antiquarks can also be specified within the basic framework of this approach while the normalization of the gluon orbital structure function requires some additional assumptions.
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