Photon-photon scattering at future lepton colliders can access Collins and unpolarized TMD fragmentation functions through two-hadron azimuthal asymmetries around the jet thrust axis, with enhanced up-quark flavor sensitivity.
An energy scale dependence of parton distribution and fragmenta tion functions is implied throughout this paper
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First insight into transverse-momentum-dependent fragmentation physics at photon-photon colliders
Photon-photon scattering at future lepton colliders can access Collins and unpolarized TMD fragmentation functions through two-hadron azimuthal asymmetries around the jet thrust axis, with enhanced up-quark flavor sensitivity.