Open-beauty production in p Pb collisions at sNN=5 TeV: Effect of the gluon nuclear densities

We present our results on open-beauty production in proton–nucleus collisions for the recent LHC p  Pb run at sNN=5 TeV. We have analyzed the effect of the modification of the gluon PDFs in a nucleus at the level of the nuclear modification factor. Because of the absence of measurements in pp   collisions at the same collision energy, sNN, we also propose the study of the forward-to-backward yield ratio in which the unknown proton–proton yield cancels. Our results are compared with the data obtained by the LHCb collaboration and show a good agreement.