Measurement of ? production in pp collisions at vs = 5 TeV

The production cross-sections of ? mesons, namely ?(1S), ?(2S) and ?(3S), in pp collisions at s = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb-1 collected by the LHCb detector. The ? mesons are reconstructed in the decay mode ? ? µ + µ -. Double differential cross-sections times branching fractions, as functions of the transverse momentum p T and the rapidity y of the ? mesons, are measured in the range p T < 20 GeV/c and 2.0 < y < 4.5. The results integrated over these p T and y ranges are s(?(1S))×B(?(1S)?µ+µ-)=2101±33±83pb,s(?(2S))×B(?(2S)?µ+µ-)=526±20±21pb,s(?(3S))×B(?(3S)?µ+µ-)=242±16±10pb, where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different ? states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of ?(1S) at s = 5 TeV is updated as well using the directly measured cross-section results from this analysis. [Figure not available: see fulltext.]