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dc.contributorUniversitat Ramon Llull. La Salle
dc.contributorCERN
dc.contributor.authorBadalov, Alexey
dc.contributor.authorCalvo Gómez, Míriam
dc.contributor.authorVilasís Cardona, Xavier
dc.contributor.authorLHCb Collaboration - CERN
dc.date.accessioned2021-05-07T15:08:56Z
dc.date.accessioned2023-10-02T06:34:47Z
dc.date.available2021-05-07T15:08:56Z
dc.date.available2023-10-02T06:34:47Z
dc.date.created2014-07
dc.date.issued2014-09
dc.identifier.urihttp://hdl.handle.net/20.500.14342/3329
dc.description.abstractA 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 Jψ ψ and J S ψψ (2 ) 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 58 10(stat) 6(syst) pb, 63 (stat) 10(syst) pb, 237 pb, 69 nb, 45 pb, 141 pb, S S S J J J (2 ) 18 27 (2 ) (2 ) c0 c0 c1 c1 c2 c2 σ σ σ σ σ σ =± ± = ± < < < < ψ ψ ψψ ψ ψ χ χ χ χ χ χ − + 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.eng
dc.format.extent17 p.cat
dc.language.isoengcat
dc.publisherIOPsciencecat
dc.relation.ispartofJournal of Physics G-Nuclear and Particle Physics, 2014, Vol. 41, No. 11cat
dc.rightsAttribution 4.0 International
dc.rights© CERN
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceRECERCAT (Dipòsit de la Recerca de Catalunya)
dc.subject.otherGran col·lisionador d'hadrons (França i Suïssa)cat
dc.subject.otherPartícules (Física nuclear)cat
dc.subject.otherCol·lisions (Física nuclear)cat
dc.subject.otherProtonscat
dc.titleObservation of charmonium pairs produced exclusively in pp collisionscat
dc.typeinfo:eu-repo/semantics/articlecat
dc.typeinfo:eu-repo/semantics/publishedVersioncat
dc.rights.accessLevelinfo:eu-repo/semantics/openAccess
dc.embargo.termscapcat
dc.subject.udc539
dc.identifier.doihttps://doi.org/10.1088/0954-3899/41/11/115002cat


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Attribution 4.0 International
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/
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