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The Universal Transverse Momentum Dependent Soft Function at NNLO · Around

2015

The Universal Transverse Momentum Dependent Soft Function at NNLO

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

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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 $e^+e^-\rightarrow 2$ hadrons.
In this paper we provide this soft function at next-to-next-to-leading order (NNLO), necessary for the calculation of all TMDs at the same order, and to perform the resummation of large logarithms at next-to-next-to-next-to-leading-logarithmic accuracy.
From the results we obtain the $D$ function at NNLO, which governs the evolution of all TMDs.

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