Erratum to “Rapidity and transverse momentum dependence of inclusive J/ψ production in pp collisions at s=7 TeV” [Phys. Lett. B 704 (5) (2011) 442]

We have identified a bias in the calculation of the cross section of J/ψJ/ψ production measured in the e+e−e+e− channel at central rapidity (|y|<0.9|y|<0.9) [1]. The acceptance and efficiency corrections were evaluated using a Monte Carlo simulation, based on PYTHIA [2] and [3], which did not include the radiative decays of J/ψJ/ψ (J/ψ→e+e−γJ/ψ→e+e−γ). In these decays the reconstructed dielectron invariant mass, me+e−me+e−, is biased towards smaller values than the nominal J/ψJ/ψ mass, since the photon contribution is neglected. As a consequence, the fraction of signal events in the me+e−me+e− range 2.92–3.16 GeV/c2 was overestimated by about 10%. Moreover, the requirement of the transverse momentum of the daughter electrons being larger than 1 GeV/c is more selective for radiative than non-radiative J/ψJ/ψ decays. Therefore, the J/ψJ/ψ acceptance was also overestimated by about 5%.