A Method of Experimentally Probing Transeverse Momentum Dependent Distributions

TL;DR

This paper proposes a method to experimentally probe transverse momentum dependent distributions by calculating double spin asymmetries in pi^0 production using different models, highlighting model dependence.

Contribution

It introduces a novel approach to investigate TMDs through double spin asymmetry measurements in various experimental setups.

Findings

Results depend on the model used for calculations.

Double spin asymmetry measurements can probe TMDs.

Model-based differences suggest experimental data can distinguish models.

Abstract

We calculate the double spin asymmetry A_LL(x, y, z, P_hT) of pi^0 production with the spectator model and the model based on the factorization ansatz. We also 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 find that the results are characteristically dependent on the model used. Therefore, we suggest that the measurements of the double spin asymmetry provides a method of experimentally probing the transeverse momentum dependent distributions.