English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a calculation of the perturbative quark-to-quark transverse partondistribution function at next-to-next-to-leading order based on a gaugeinvariant operator definition. We demonstrate for the first time that such adefinition works beyond the first non-trivial order. We extract from ourcalculation the coefficient functions relevant for anext-to-next-to-next-to-leading logarithmic $Q_T$ resummation in a large classof processes at hadron colliders.

Transverse parton distribution functions at next-to-next-to-leading order: the quark-to-quark case