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Observation of charmonium pairs produced exclusively in pp collisions
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Observation of charmonium pairs produced exclusively in pp collisions. Journal of Physics G: Nuclear and Particle Physics, Volume 41 (Number 11). Article number 115002 . doi:10.1088/0954-3899/41/11/115002 ISSN 0954-3899.
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WRAP_0954-3899_41_11_115002.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (862Kb) | Preview |
Official URL: http://dx.doi.org/10.1088/0954-3899/41/11/115002
Abstract
A search is performed for the central exclusive production of pairs of charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity of 3 fb−1 collected at centre-of-mass energies of 7 and 8 TeV, J/ψJ/ψ and J(2S)/ψψ pairs are observed, which have been produced in the absence of any other activity inside the LHCb acceptance that is sensitive to charged particles in the pseudorapidity ranges (−3.5, -1.5) and (1.5, 5.0). Searches are also performed for pairs of P-wave charmonia and limits are set on their production. The cross-sections for these processes, where the dimeson system has a rapidity between 2.0 and 4.5, are measured to be
σJ/ψJ/ψ = 58 ± 10(stat) ± 6(syst) pb,
σJ/ψψ(2S) = 63+27-18 (stat) ± 10(syst) pb,
σJ/ψ(2S)ψ(2S) < 237 pb,
σχc0χc0 < 69 nb,
σχc1χc1 < 45 pb,
σχc2χc2 < 141 pb,
where the upper limits are set at the 90% confidence level. The measured J/ψJ/ψ and Jψψ(2S) cross-sections are consistent with theoretical expectations.
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