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dc.contributor.authorChatrchyan, S.A.
dc.contributor.authorKhachatryan, Vardan
dc.contributor.authorSirunyan, A.M.
dc.contributor.authorTumasyan, A.R.
dc.contributor.authorAdam, Wolfgang
dc.contributor.authorBaarmand, Marc M.
dc.contributor.authorDorney, B.
dc.contributor.authorHohlmann, Marcus
dc.contributor.authorKalakhety, Himali
dc.contributor.authorYumiceva, Francisco
dc.date.accessioned2016-08-25T21:21:54Z
dc.date.available2016-08-25T21:21:54Z
dc.date.issued2014-04-15
dc.identifier.citationThe CMS collaboration, Chatrchyan, S., Khachatryan, V. et al. J. High Energ. Phys. (2014) 2014: 103. doi:10.1007/JHEP04(2014)103en_US
dc.identifier.urihttp://hdl.handle.net/11141/978
dc.description.abstractThe production of Y (1S), Y (2S), and Y (3S) is investigated in pPb and pp collisions at centre-of-mass energies per nucleon pair of 5.02 TeV and 2.76 TeV, respectively. The datasets correspond to integrated luminosities of about 31 nb−1 (pPb) and 5.4 pb−1 (pp), collected in 2013 by the CMS experiment at the LHC. Upsilons that decay into muons are reconstructed within the rapidity interval |yCM| < 1.93 in the nucleon-nucleon centre-of-mass frame. Their production is studied as a function of two measures of event activity, namely the charged-particle multiplicity measured in the pseudorapidity interval |η| < 2.4, and the sum of transverse energy deposited at forward pseudorapidity, 4.0 < |η| < 5.2. The YY cross sections normalized by their event activity integrated values, YY (nS)/〈 YY (nS)〉, are found to rise with both measures of the event activity in pp and pPb. In both collision systems, the ratios of the excited to the ground state cross sections, Y (nS)/ Y (1S), are found to decrease with the charged-particle multiplicity, while as a function of the transverse energy the variation is less pronounced. The event activity integrated double ratios, [ Y (nS)/ Y (1S)]pPb/[ Y (nS)/ Y (1S)]pp, are also measured and found to be 0.83 ± 0.05 (stat.) ± 0.05 (syst.) and 0.71 ± 0.08 (stat.) ± 0.09 (syst.) for (2S) and Y (3S), respectively.en_US
dc.language.isoen_USen_US
dc.rightshe Journal of High Energy Physics (JHEP) is an open-access journal funded by SCOAP3 (scoap3.org) and licensed under CC BY 4.0en_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.titleEvent activity dependence of Υ(nS) production in √SNN = 5.02 TeV pPb and √s = 2.76 TeV pp collisionsen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/JHEP04(2014)103


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he Journal of High Energy Physics (JHEP) is an open-access journal funded by SCOAP3 (scoap3.org) and licensed under CC BY 4.0
Except where otherwise noted, this item's license is described as he Journal of High Energy Physics (JHEP) is an open-access journal funded by SCOAP3 (scoap3.org) and licensed under CC BY 4.0