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Abstract |
An updated measurement of exclusive J/psi and psi(2S) vector meson production using 1/fb at 7 TeV is presented. The measured integrated and differential cross-sections are compared to several theoretical predictions. The data are sufficiently sensitive to distinguish between LO and 'NLO' predictions. The forward reach of the LHCb detector probes small values of x, and these results can be used to constrain the gluon PDF down to x=5E-6. The data are also compared to models that include saturation effects, which may become important at such low x-values. Comparisons are also made to photoproduction results from HERA and fixed target experiments.
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