Principle of Balance and the Sea Content of the Proton

Details Principle of Balance and the Sea Content of the Proton Principle of Balance and the Sea Content of the Proton

2002-04-30

arxiv.org/abs/hep-ph/0204344v1

Phys.Rev. D65 (2002) 114005

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 latex pages, 4 ps figures, to appear in PRD

Scientific paper

10.1103/PhysRevD.65.114005

In this study, the proton is taken as an ensemble of quark-gluon Fock states. Using the principle of balance that every Fock state should be balanced with all of the nearby Fock states (denoted as the balance model), instead of the principle of detailed balance that any two nearby Fock states should be balanced with each other (denoted as the detailed balance model), the probabilities of finding every Fock state of the proton are obtained. The balance model can be taken as a revised version of the detailed balance model, which can give an excellent description of the light flavor sea asymmetry (i.e., $\bar{u}\not= \bar{d}$) without any parameter. In case of $g\Leftrightarrow gg$ sub-processes not considered, the balance model and the detailed balance model give the same results. In case of $g\Leftrightarrow gg$ sub-processes considered, there is about 10 percent difference between the results of these models. We also calculate the strange content of the proton using the balance model under the equal probability assumption.

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