Speaker
Benjamin Guiot
(Universidad Tecnica Federico Santa Maria)
Description
Nearly ten years ago, Kang, Ma, Qiu, and Sterman derived an evolution equation for a heavy-quark pair fragmenting into a quarkonium. In this study we explore the consequence of this evolution for the color-evaporation model, focusing on $J/\psi$ transverse-momentum distributions in proton-proton collisions. In particular, I will show that it brings NLO calculations in agreement with data. Given the significant impact of the evolution on the transverse-momentum spectrum, our study suggests that this effect should be included in the fits of NRQCD long-distance-matrix elements.
We used a transverse-momentum-dependent formalism, and I will argue that quarkonium data could help constrain unintegrated PDFs.
Primary author
Benjamin Guiot
(Universidad Tecnica Federico Santa Maria)
