Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-15
JHEP 0908:007,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages
Scientific paper
10.1088/1126-6708/2009/08/007
Using the AdS/CFT correspondence, we calculate the polarized structure functions in strongly coupled N=4 supersymmetric Yang-Mills theory deformed in the infrared. We find that the flavor singlet contribution to the g_1 structure function is vanishingly small, while the flavor non-singlet contribution shows the Regge behavior at small-x with an intercept slightly less than 1. We explicitly check that the latter satisfies the moment sum rule. We discuss the `spin crisis' problem and suggest that at strong coupling the spin of a hadron entirely comes from the orbital angular momentum.
Hatta Yoshitaka
Ueda Takahiro
Xiao Bo-Wen
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