Measurement of J/ψ production cross-sections in pp collisions at 13 TeV. [ σ(prompt Jψ) = 15.35±0.03±0.85 μb; σ(Jψ-from-b-hadron) = 2.36±0.01±0.13 μb; σ( bb) = 518±2±53 μb ] At the EPS-HEP 2015 conference in Vienna the LHCb collaboration has presented today the first measurement of the probability to produce a J/ψ meson in proton-proton collisions at…