Combining QED and QCD transverse-momentum resummation for Z boson production at hadron colliders

Journal of High Energy Physics

Leandro Cieri¹  Giancarlo Ferrera²  Germán F. R. Sborlini² 

[1] INFN, Sezione di Milano-Bicocca;Tif Lab, Dipartimento di Fisica, Università di Milano and INFN, Sezione di Milano;

关键词: Resummation;    Perturbative QCD;    Precision QED;   

DOI  :  10.1007/JHEP08(2018)165

来源: DOAJ

【 摘 要 】

Abstract We consider the transverse-momentum (q T ) distribution of Z bosons produced in hadronic collisions. At small values of q T , we perform the analytic resummation of the logarithmically enhanced QED contributions up to next-to-leading logarithmic accuracy, including the mixed QCD-QED contributions at leading logarithmic accuracy. Resummed results are consistently matched with the next-to-leading fixed-order results (i.e. O $$ \mathcal{O} $$(α 2)) at small, intermediate and large values of q T . We combine the QED corrections with the known QCD results at next-to-next-to-leading order OαS2 $$ \left(\mathcal{O}\left({\alpha}_S^2\right)\right) $$ and next-to-next-to-leading logarithmic accuracy. We show numerical results at LHC and Tevatron energies, studying the impact of the QED corrections and providing an estimate of the corresponding perturbative uncertainty. Our analytic results for the combined QED and QCD resummation, obtained through an extension of the q T resummation formalism in QCD, are valid for the production of generic neutral and colourless high-mass systems in hadronic collision.

【 授权许可】

Unknown