TL;DR
This paper reviews the current state of TMD phenomenology, focusing on unpolarized TMD PDFs and the Sivers function, and discusses the new CSS TMD evolution formalism alongside existing approaches.
Contribution
It introduces and comments on the new CSS TMD evolution formalism and compares it with previous Gaussian models in TMD phenomenology.
Findings
CSS TMD evolution formalism offers a new approach.
Gaussian models have limitations in describing TMD data.
The review highlights successes and failures of current TMD models.
Abstract
We present a review of current Transverse Momentum Dependent (TMD) phenomenology focusing our attention on the unpolarized TMD parton distribution function and the Sivers function. The paper introduces and comments about the new Collins-Soper-Sterman (CSS) TMD evolution formalism. We make use of a selection of results obtained by several groups to illustrate the achievements and the failures of the simple Gaussian approach and the TMD CSS evolution formalism.
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