The gluon spin in the chiral bag model
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The gluon spin in the chiral bag model

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 Lee, Hee-Jung; Min, Dong-Pil; Park, Byung Yoon; Rho, Mannque; Vento Torres, Vicente Aquest document és un/a article, creat/da en: 2000 We study the gluon polarization contribution at the quark model renormalization scale to the proton spin, Γ, in the chiral bag model. It is evaluated by taking the expectation value of the forward matrix element of a local gluon operator in the axial gauge A+=0. It is shown that the confining boundary condition for the color electric field plays an important role. When a solution satisfying the boundary condition for the color electric field, which is not the conventionally used but which we favor, is used, the Γ has a positive value for {\it all} bag radii and its magnitude is comparable to the quark spin polarization. This results in a significant reduction in the relative fraction of the proton spin carried by the quark spin, which is consistent with the small flavor singlet axial current measured in the EMC experiments. Lee, Hee-Jung Min, Dong-Pil Park, Byung Yoon Rho, Mannque Vento Torres, Vicente 2000 The gluon spin in the chiral bag model Physics Letters B 491 3-4 257 262 http://dx.doi.org/10.1016/S0370-2693(00)01054-6