Speaker
Francesco Fiori
(PI)
Description
his contribution describes the measuremet of J/psi iclusive, prompt and non-prompt cross section using the dimuon channel in the CMS experiment, recently published on EPJC. The analysis is now close to be updated to 40 pb-1 data (the full 2010 statistics) with the inclusion of the psi(2S) cross section. An important contribution to the systematics for this analysis is given by the uncertainty on the prompt J/psi polarization, in particular the detector acceptance is strongly dependent by the leptons' angular distribution. A complex framework for a measure of the J/psi polarization has been developed by the CMS collaboration and a measure of the angular parameters is foreseen for the coming months. A brief description of the main problematics of the polarization measurement is also given.
