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Using chiral symmetry we investigate the leading SU(3) violation in light-cone distribution functions φM(x) of the pion, kaon, and eta. It is shown that terms nonanalytic in the quark masses do not affect the shape, and only appear in the decay constants. Predictive power is retained including the leading analytic mq operators. With the symmetry violating corrections we derive useful model-independent relations between φ_π,φ_η,φ_K⁺,K⁰, and φ_K̄⁰,K^-. Using the soft-collinear effective theory we discuss how factorization generates the subleading chiral coefficients.
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Chen et al. (2004) studied this question.
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