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The dynamical breaking of chiral symmetry in QCD is caused by nonperturbativeinteractions on a scale rho ~ 0.3 fm, much smaller than the hadronic size R ~ 1fm. These short-distance interactions influence the intrinsic transversemomentum distributions of partons and their correlations at a low normalizationpoint. We study this phenomenon in an effective description of low-energydynamics based on chiral constituent quark degrees of freedom, which refers tothe large-N_c limit of QCD. The nucleon is obtained as a system of constituentquarks and antiquarks moving in a self-consistent classical chiral field(chiral quark-soliton model). The calculated distributions of constituentquarks/antiquarks are matched with QCD partons at the scale rho^{-2}. The p_Tdistribution of valence quarks is localized at p_T^2 ~ R^{-2} and roughly ofGaussian shape. The sea quark distribution exhibits a would-be power-like tail~1/p_T^2 extending up to the chiral symmetry-breaking scale. Such behavior isseen in the flavor-singlet unpolarized and nonsinglet polarized sea. Thehigh-momentum tails are the result of short-range correlations between seaquarks in the nucleon's light-cone wave function, analogous to NN correlationsin nuclei. The nucleon wave function contains correlated pairs of transversesize rho << R with sigma- and pi-like quantum numbers, whose internal wavefunctions become identical at p_T^2 ~ rho^{-2} (restoration of chiralsymmetry). These features are model-independent and represent an effect ofdynamical chiral symmetry breaking on the nucleon's partonic structure. Ourresults have numerous implications for the P_T distributions of particlesproduced in hard scattering processes. The nonperturbative parton correlationspredicted here could be observed in particle correlations between the currentand target fragmentation regions of DIS.

Intrinsic transverse momentum and parton correlations from dynamical chiral symmetry breaking