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We present the complete leading-order results for the azimuthal dependencesand polarization observables in $e^+e^-\to h_1 h_2 + X$ processes, where thetwo hadrons are produced almost back-to-back, within a transverse momentumdependent (TMD) factorization scheme. We consider spinless (or unpolarized) andspin-1/2 hadron production and give the full set of the corresponding quark andgluon TMD fragmentation functions (TMD-FFs). By adopting the helicityformalism, which allows for a more direct probabilistic interpretation, single-and double-polarization cases are discussed in detail. Simplified expressions,useful for phenomenological analyses, are obtained by assuming a factorizedGaussian-like dependence on intrinsic transverse momenta for the TMD-FFs.

General helicity formalism for two-hadron production in $e^+e^-$ annihilation within a TMD approach