Observation of charmonium pairs produced exclusively in pp collisions

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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/ψψ (2S) 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 σ J/ψJ/ψ = 58 ± 10(stat) ± 6(syst) pb, σ J/ψψ(2S) = 63 -18+27 (stat) ± 10(syst) pb, σ ψ(2S)ψ(2S) < 237 pb, σ χc0χc0 < 69 nb, σ χc1χc1 < 45 pb, σ χc2χc2 141 pb, where the upper limits are set at the 90% confidence level. The measured J/ψJ/ψ and J/ψψ (2S) cross-sections are consistent with theoretical expectations.

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Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., … Zvyagin, A. (2014). Observation of charmonium pairs produced exclusively in pp collisions. Journal of Physics G: Nuclear and Particle Physics, 41(11). https://doi.org/10.1088/0954-3899/41/11/115002

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