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Based on the chiral perturbation theory, we investigate the low-energydynamics of nucleon parton distributions. We show that in different regions ofthe momentum fraction $x$ the chiral expansion is significantly different. Fornucleon parton distributions these regions are characterized by $x\sim1$,$x\sim m_\pi/M_N$ and $x\sim (m_\pi/M_N)^2$. We derive extended counting rulesfor each region and obtain model-independent results for the nucleon partondistributions down to $x\gtrsim m^2_\pi/M^2_N \approx 10^{-2}$.

Chiral expansion of nucleon PDF at $x\sim m_\pi/M_N$