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Observation of charmonium pairs produced exclusively in pp collisions

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Observation of charmonium pairs produced exclusively in pp collisions

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dc.contributor.author	LHCb Collaboration
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Oyanguren Campos, Arantza
dc.contributor.author	Ruiz Valls, Pablo
dc.contributor.author	Sánchez Mayordomo, Carlos
dc.date.accessioned	2016-04-19T12:40:52Z
dc.date.available	2016-04-19T12:40:52Z
dc.date.issued	2014
dc.identifier.citation	LHCb Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Ruiz Valls, Pablo Sánchez Mayordomo, Carlos 2014 Observation of charmonium pairs produced exclusively in pp collisions Journal of Physics G-Nuclear and Particle Physics 41 11 115002-1 115002-17
dc.identifier.uri	http://hdl.handle.net/10550/52840
dc.description.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/psi J/psi and J/psi psi (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 sigma (J/psi J/psi) = 58 +/- 10(stat) +/- 6(syst) pb, sigma(J/psi psi(2S)) = 63(-18)(+27)(stat) +/- 10(syst) pb, sigma(psi(2S)psi(2S)) < 237 pb, sigma(chi)(chi)(C0)(C0) < 69 nb, sigma(chi)(chi)(C1)(C1) < 45 pb, sigma(chi)(chi)(C2)(C2) < 141 pb, where the upper limits are set at the 90% confidence level. The measured J/psi J/psi and J/psi psi (2S) cross-sections are consistent with theoretical expectations.
dc.language.iso	eng
dc.relation.ispartof	Journal of Physics G-Nuclear and Particle Physics, 2014, vol. 41, num. 11, p. 115002-1-115002-17
dc.subject	Física nuclear
dc.title	Observation of charmonium pairs produced exclusively in pp collisions
dc.type	journal article	es_ES
dc.date.updated	2016-04-19T12:40:52Z
dc.identifier.doi	10.1088/0954-3899/41/11/115002
dc.identifier.idgrec	101797
dc.rights.accessRights	open access	es_ES