Observation of charmonium pairs produced exclusively in pp collisions
Name
Aaij_2014_J._Phys._G _Nucl._Part._Phys._41_115002.pdf
Description
Published version
Size
691.56 KB
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Unknown
Checksum (MD5)
48e5afac0bc49f50bdabc1202b5aa679
Author(s)
The LHCb Collaboration
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
2014
Journal
Journal of Physics G: Nuclear and Particle Physics
Publisher
IOP Publishing
Citation
Aaij, R., et al. "Observation of Charmonium Pairs Produced Exclusively in Collisions." Journal of Physics G: Nuclear and Particle Physics 41 11 (2014): 115002 (17 pp.).
Version
Final published version
Abstract
© CERN 2014 On behalf of the LHCb Collaboration. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1088/0954-3899/41/11/115002
