Abstract
We present the complete leading-order results for the azimuthal dependences and polarization observables in e+e− → h1h2 + X processes, where the two hadrons are produced almost back-to-back, within a transverse momentum dependent (TMD) factorization scheme. We consider spinless (or unpolarized) and spin-1/2 hadron production and give the full set of the corresponding quark and gluon TMD fragmentation functions (TMD-FFs). By adopting the helicity formalism, 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 factorized Gaussian-like dependence on intrinsic transverse momenta for the TMD-FFs.
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D’Alesio, U., Murgia, F. & Zaccheddu, M. General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach. J. High Energ. Phys. 2021, 78 (2021). https://doi.org/10.1007/JHEP10(2021)078
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DOI: https://doi.org/10.1007/JHEP10(2021)078