Deep inelastic scattering from gauge string duality in the soft wall model

Ballon-Bayona, Alfonso; Boschi-Filho, Henrique; Braga, Nelson R. F.

doi:10.1088/1126-6708/2008/03/064

Cited by 63 publications

(68 citation statements)

References 31 publications

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“…In the context of gauge/string duality, DIS was first formulated in [16] for the unpolarized case (see, also [17][18][19][20][21][22]), and recently generalized to the polarized case in [23]. The analysis of [23] is focused on the large-x region which corresponds to the supergravity approximation on the string theory side.…”

Section: Jhep08(2009)007mentioning

confidence: 99%

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

Hatta¹,

Ueda²,

Xiao³

2009

J. High Energy Phys.

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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.

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Section: Jhep08(2009)007mentioning

confidence: 99%

“…The insertion of the operator J + c (0) excites a non-normalizable mode of the bulk gauge field 19) where A + (x ′ ) is the boundary source which, for a local insertion J + c (y ′ = 0), is given by a delta function A µ (y ′ ) = δ + µ δ (4) (y ′ ). The integral kernel in (4.19) is the bulk-to-boundary propagator.…”

Section: A Pragmatic Approachmentioning

confidence: 99%

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

Hatta¹,

Ueda²,

Xiao³

2009

J. High Energy Phys.

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“…After this seminal proposal, several calculations have been carried out in various holographic frameworks [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. In particular, in [39] the nucleon structure function F 2 was computed analyzing the virtual γ * p total cross section, and two contributions were obtained, a term for conformal gauge theories and an additional term accounting for confinement.…”

Section: Holographic Proton Structure Functionsmentioning

confidence: 99%

“…[14]), [15][16][17] is important to access the nonperturbative sector of gauge theories, and can be used to study features of QCD [18][19][20][21]. The method has been applied to DIS at strong coupling [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. In particular, at low x the nucleon structure function F N 2 (x, Q 2 ) has been computed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure functions at low- $$x$$ x in a holographic approach

2014

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Nuclear effects in deep inelastic scattering at low x are phenomenologically described changing the typical dynamical and/or kinematical scales characterizing the free nucleon case. In a holographic approach, this rescaling is an analytical property of the computed structure function F 2 (x, Q 2 ). This function is given by the sum of a conformal term and of a contribution due to quark confinement, depending on IR hard-wall parameter z 0 and on the mean square distances, related to a parameter Q , among quarks and gluons in the target. The holographic structure function per nucleon in a nucleus A is evaluated showing that a rescaling of the typical nucleon size, z 0 and Q , due to nuclear binding, can be reabsorbed in a Q 2 -rescaling scheme. The difference between neutron and proton structure functions and the effects of the longitudinal structure functions can also be taken into account. The obtained theoretical results favorably compare with the experimental data.

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“…The description of DIS using the soft wall AdS/QCD model was presented in [17]. The hadronic structure functions found from the hard and soft wall models are different, although they agree at leading order.…”

Section: Introductionmentioning

confidence: 99%