Workshop on Resummation, Evolution, Factorization

Lam-Tung relation in Z0 hadroproduction as a probe of gluon TMD

7 Nov 2016, 14:10

30m

Klooster van de Grauwzusters (University of Antwerp)

Plenary Higgs/DY/QQbar production

Speaker

Leszek Motyka

Description

Recent ATLAS data of dilepton angular distribution from Z0 hadroproduction provide a stringent test of QCD predictions. The measured Lam-Tung combination of dilepton angular coefficients shows strong deviations from collinear QCD predictions at the NNLO accuracy. We describe this observable within the kT-factorization framework and show that it is sensitive to the shape of gluon TMD. An improved description of the data is obtained with a gluon TMD with a hard ~1/k^2 tail at moderate gluon x.

Presentation materials

motykaLT_Ant.pdf