3rd International Conference on the Initial Stages in High-Energy Nuclear Collisions (InitialStages2016)

Nuclear glue constraints from top-quark pair production in p-A and A-A collisions at the LHC and beyond

24 May 2016, 15:10

20m

Room 02.1 (Centro de Congressos, Instituto Superior Técnico, Alameda Campus)

Parallel Parallel

Speaker

David d'Enterria (CERN)

Description

I will present phenomenological studies of top-quark pair production in p-Pb and Pb-Pb collisions at the CERN LHC and at the future circular collider (FCC), obtained with NLO pQCD calculations including nuclear PDFs. In their fully-leptonic decay mode (ttbar->W+W-bbbar->l+l- nunu bbbar), one expects 90 (Pb-Pb) and 300 (p-Pb) top-quarks cleanly tagged per nominal LHC-year, and 47,000--100,000 per FCC-year at sqrt(s_NN)= 39, 63 TeV, after typical ATLAS/CMS-like acceptance and efficiency cuts. Using a Hessian PDF reweighting technique, we demonstrate that the rapidity distributions of the t-tbar decay leptons provide quantitative constraints of the Pb gluon density at high virtualities, whose uncertainty can be reduced by up to 30% at the LHC (full heavy-ion programme), and by 70% per FCC-year [1]. [1] D. d'Enterria, K.Krajczar, H.Paukkunen, Phys. Lett. B746 (2015) 64-72; arXiv:1501.05879

Presentation materials

dde_top_glue_ISlisbon_may16.pdf