Higher twist parton distributions from LCWFs

Abstract. We report on the results of a recent work [1], where we explore the possibility to con-struct higher-twist parton distributions in a nucleon at some low reference scale from convolution integrals of the light-cone wave functions (LCWFs). These WFs provide one with a reasonable description of both polarized and unpolarized parton densities at large values of the Bjorken vari-able. Twist-3 parton distributions are then constructed as convolution integrals of qqqg and usual three-quark WFs. Higher-twist parton distributions are conceptually very interesting as they go beyond the simple parton model description and allow one to quantify correlations between the partons. Unfortunately, they prove to be very elusive. Despite considerable efforts, very little is known even about the simplest, twist-3 distributions. We tried to make a step in this direction by using a representation in terms of overlap integrals of light-cone wave functions, including only Fock states with the minimum (valence) and next-to-minimum (one extra gluon) parton content. We borrow the expressions for three-quark wave functions from Ref. [2] which have been shown [2, 3] to provide one with a good description for quark parton densities at large x and the nucleon magnetic form factor. The state can be described in terms of the single LCWF [2, 4] |p,+〉uud ∝ ε i jk [DX]3