Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(s)NN=2.76 TeV

Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(s)NN=2.76 TeV

A comparison of the relative yields of Υ resonances in the μ[superscript +]μ[superscript -] decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4  ...

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Bibliographic Details
Main Authors: Alver, Burak Han, Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Everaerts, Pieter Bruno Bart, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Kim, Y., Klute, Markus, Li, W., Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Sung, Kevin Kai Hong, Velicanu, Dragos Alexandru, Wenger, Edward Allen, Xie, Si, Yilmaz, Yetkin, Zanetti, Marco, Harris, Philip Coleman, Luckey Jr, P David, Roland, Gunther M, Stoeckli, Fabian, Yang, Mingming, Bauer, Gerry P, Lee, Yen-Jie, Loizides, Constantinos, Roland, Christof E, Sumorok, Konstanty C
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2011
Online Access:http://hdl.handle.net/1721.1/66979
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-0869-5631
Description
Summary:A comparison of the relative yields of Υ resonances in the μ[superscript +]μ[superscript -] decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4  GeV/c and pseudorapidity below 2.4, the double ratio of the Υ(2S) and Υ(3S) excited states to the Υ(1S) ground state in Pb-Pb and pp collisions, [Υ(2S+3S)/Υ(1S)][subscript Pb-Pb]/[Υ(2S+3S)/Υ(1S)][subscript pp], is found to be 0.31[subscript -0.15][superscript +0.19](stat)±0.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.

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