Quantifying photoproduction corrections to J/ψ measurements in Au+Au and Cu+Cu collisions at sNN=200 GeV

The contribution of J/ψ production from coherent and incoherent photon-induced production is calculated in Au+Au and Cu+Cu collisions at √sNN=200 GeV. The yield and nuclear modification factors (RAA) contributed by photoproduction are presented as functions of transverse momentum (pT) and centrality at both mid- and forward rapidity (y). The RAA of J/ψ from photoproduction is found to be as high as 0.6 in the lowest pT bin (0<pT<1 GeV/c) at midrapidity in 60--92% Au+Au collisions. The RAA measured in Au+Au and Cu+Cu collisions at √sNN=200 GeV are corrected by subtracting the calculated photoproduction contribution.