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Event activity dependence of (nS) production in=5.02 TeV pPb and=2.76 TeV pp collisions

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; ... mehr

The 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 &#8722;1 (pPb) and 5.4 pb &#8722;1 (pp), collected in 2013 by the CMS experiment at the LHC. Upsilons that decay into muons are reconstructed within the rapidity interval | y CM | < 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 | &#951; | < 2 . 4, and the sum of transverse energy deposited at forward pseudorapidity, 4 . 0 < | &#951; | < 5 . 2. The Y cross sections normalized by their event activity integrated values, Y (nS) / &#12296; Y (nS)&#12297;, 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. ... mehr

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DOI: 10.5445/IR/1000042188
DOI: 10.1007/JHEP04(2014)103
Zitationen: 58
Web of Science
Zitationen: 73
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000042188
Erschienen in Journal of High Energy Physics
Band 2014
Heft 4
Seiten 103
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in Web of Science
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