Updated measurements of exclusive<i>J</i>/ψ and ψ(2S) production cross-sections in<i>pp</i>collisions at $\sqrt{s}=7$ TeV

Abstract

The differential cross-section as a function of rapidity has been measured\nfor the exclusive production of $J/\\psi$ and $\\psi(2S)$ mesons in proton-proton\ncollisions at $\\sqrt{s}=7$ TeV, using data collected by the LHCb experiment,\ncorresponding to an integrated luminosity of 930 pb$^{-1}$. The cross-sections\ntimes branching fractions to two muons having pseudorapidities between 2.0 and\n4.5 are measured to be $$\\begin{array}{rl} \\sigma_{pp\\rightarrow\nJ/\\psi\\rightarrow{\\mu^+}{\\mu^-}}(2.0&lt;\\eta_{\\mu^\\pm }&lt;4.5)=&amp;291\\pm 7\\pm19 {\\rm \\\npb},\\\\\n\\sigma_{pp\\rightarrow\\psi(2S)\\rightarrow{\\mu^+}{\\mu^-}}(2.0&lt;\\eta_{\\mu^\\pm}&lt;4.5)=&amp;6.5\\pm\n0.9\\pm 0.4 {\\rm \\ pb},\\end{array}$$ where the first uncertainty is statistical\nand the second is systematic. The measurements agree with next-to-leading order\nQCD predictions as well as with models that include saturation effects.\n