Measurement of J/Ψ production in pp collisions at TeV

The production of mesons in proton–proton collisions at is studied with the LHCb detector at the LHC. The differential cross-section for prompt production is measured as a function of the transverse momentum p T and rapidity y in the fiducial region and y ∈[2.0;4.5]. The differential cross-section and fraction of from b -hadron decays are also measured in the same p T and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb −1 . The measured cross-sections integrated over the fiducial region are [InlineEquation not available: see fulltext.] for prompt  production and [InlineEquation not available: see fulltext.] for from b -hadron decays, where the first uncertainty is statistical and the second systematic. The prompt  production cross-section is obtained assuming no polarisation and the third error indicates the acceptance uncertainty due to this assumption.