Observation of Sequential Υ Suppression in PbPb Collisions

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dc.citation.firstpage222301en_US
dc.citation.issueNumber22en_US
dc.citation.journalTitlePhysical Review Lettersen_US
dc.citation.volumeNumber109en_US
dc.contributor.authorAdair, A.en_US
dc.contributor.authorBoulahouache, C.en_US
dc.contributor.authorEcklund, K.M.en_US
dc.contributor.authorGeurts, F.J.M.en_US
dc.contributor.authorPadley, B.P.en_US
dc.contributor.authorRedjimi, R.en_US
dc.contributor.authorRoberts, J.en_US
dc.contributor.authorZabel, J.en_US
dc.date.accessioned2015-09-09T17:08:48Zen_US
dc.date.available2015-09-09T17:08:48Zen_US
dc.date.issued2012en_US
dc.description.abstractThe suppression of the individual Υ(nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150  μb−1 and 230  nb−1, respectively, collected in 2011 by the CMS experiment at the LHC, at a center-of-mass energy per nucleon pair of 2.76 TeV. The Υ(nS) yields are measured from the dimuon invariant mass spectra. The suppression of the Υ(nS) yields in PbPb relative to the yields in pp, scaled by the number of nucleon-nucleon collisions, RAA, is measured as a function of the collision centrality. Integrated over centrality, the RAA values are 0.56±0.08(stat)±0.07(syst), 0.12±0.04(stat)±0.02(syst), and lower than 0.10 (at 95% confidence level), for the Υ(1S), Υ(2S), and Υ(3S) states, respectively. The results demonstrate the sequential suppression of the Υ(nS) states in PbPb collisions at LHC energies.en_US
dc.identifier.citationAdair, A., Boulahouache, C., Ecklund, K.M., et al.. "Observation of Sequential Υ Suppression in PbPb Collisions." <i>Physical Review Letters,</i> 109, no. 22 (2012) American Physical Society: 222301. http://dx.doi.org/10.1103/PhysRevLett.109.222301.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.109.222301en_US
dc.identifier.urihttps://hdl.handle.net/1911/81629en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.titleObservation of Sequential Υ Suppression in PbPb Collisionsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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