Polarized DIS in Script N = 4 SYM: where is spin at strong coupling?

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Published 5 August 2009 • Published under licence by IOP Publishing Ltd
, , Citation Yoshitaka Hatta et al JHEP08(2009)007 DOI 10.1088/1126-6708/2009/08/007

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Author affiliations

1 Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

2 Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.

Dates

  1. Received 20 May 2009
  2. Accepted 21 July 2009
  3. Published

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Abstract

Using the AdS/CFT correspondence, we calculate the polarized structure functions in strongly coupled Script N = 4 supersymmetric Yang-Mills theory deformed in the infrared. We find that the flavor singlet contribution to the g1 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.

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10.1088/1126-6708/2009/08/007