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We calculate the double spin asymmetry A_LL(x, y, z, P_hT) of pi^0 productionwith the spectator model and the model based on the factorization ansatz. Wealso calculate the double spin asymmetry for the integration over the range of(x,y,z) for the setups of the experiments of COMPASS, HERMES, and JLab. We findthat the results are characteristically dependent on the model used. Therefore,we suggest that the measurements of the double spin asymmetry provides a methodof experimentally probing the transeverse momentum dependent distributions.

A Method of Experimentally Probing Transeverse Momentum Dependent Distributions