Twist-3 distribution amplitudes of the pion and kaon are studied in this paper. We calculate the fist several moments for the twist-3 distribution amplitudes (φ π p,σ and φ K p,σ) of the pion and kaon by applying the QCD sum rules. Our results show that, (i) the first three moments of φ K p and the first two moments of φ π p and φ π,K σ of the pion and kaon can be obtained with 30% uncertainty; (ii) the fourth moment of the φ π p and the second moment of the φ K σ can be obtained when the uncertainty are relaxed to 35%; (iii) the fourth moment of the φ π σ can be obtained only when the uncertainty are relaxed to 40%; (iv) we have m p 0π = 1.10 ± 0.08 GeV and m p 0K = 1.25 ± 0.15 GeV after including the α s-corrections to the perturbative part. These moments will be helpful for constructing the twist-3 wave functions of the pion and kaon.

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A Skyrme type Lagrangian for a skyrmion imbedded in a baryon rich environment is proposed. The dependence of static nucleon properties and nucleon -nucleon tensor interaction on nuclear density is investigated.PACS number(s): 12.39.Dc, 12.39.Fe