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Universal transverse momentum dependent soft function at NNLO

Echevarria, Miguel G. ; Scimemi, Ignazio ; Vladimirov, Alexey


All (un) polarized transverse momentum dependent functions (TMDs), both distribution and fragmentation functions, are defined with the same universal soft function, which cancels spurious rapidity divergences within an individual TMD and renders them well-defined hadronic quantities. Moreover, it is independent of the kinematics, whether it is Drell-Yan, deep inelastic scattering, or e(+)e(-) -> ...


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