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

Quarkonia production in different high-energy processes has recently beenproposed in order to probe gluon transverse-momentum-dependent partondistribution and fragmentation functions (TMDs in general). However, no properfactorization theorems have been derived for the discussed processes, butrather just ansatzs, whose main assumption is the factorization of the two softmechanisms present in the process: soft-gluon radiation and the formation ofthe bound state. In this paper it is pointed out that, at low transversemomentum, these mechanisms are entangled and thus encoded in a new kind ofnon-perturbative hadronic quantities beyond the TMDs: the TMD shape functions.This is illustrated by deriving the factorization theorem for the process$pp\to \eta_{c,b}$ at low transverse momentum.

Proper TMD factorization for quarkonia production: $pp\to\eta_{c,b}$ as a study case