Deep inelastic scattering off scalar mesons in the 1/N expansion from the D3D7-brane system

Deep inelastic scattering (dis) of charged leptons off scalar mesons in the 1/n expansion is studied by using the gauge/gravity duality. we focus on the d3d7-brane system and investigate the corresponding structure functions by considering both the high energy limit and the 1/n expansion. these limits do not commute. from the d7-brane dbi action we derive a lagrangian at sub-leading order in the d7-brane fluctuations and obtain a number of interactions some of which become relevant for two-hadron final-state dis. by considering first the high energy limit followed by the large n one, our results fit lattice qcd data within 1.27% for the first three moments of f 2 for the lightest pseudoscalar meson.