Paper
Very low $x$ gluon density determined by LHCb exclusive $J/ψ$ data
Authors
Chris A. Flett, Alan D. Martin, Misha G. Ryskin, Thomas Teubner
Abstract
The low behaviour of the gluon density at scale GeV is determined using exclusive production data from HERA and LHCb within the framework of collinear factorisation at next-to-leading order (NLO). It is shown that in the interval the gluon distribution function grows as with . The impact this experimental data will have for the global parton distribution function (PDF) analyses in this low domain is quantified. No indication in favour of parton density saturation is observed.