Measurement of prompt J/ψ pair production in pp collisions at s √s = 7 Tev

Measurement of prompt J/ψ pair production in pp collisions at s √s = 7 Tev

Production of prompt J/ψ meson pairs in proton-proton collisions at s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb[superscript −1]. The two J/ψ mesons are fully reconstructed via their decays into μ + μ − pairs. Th...

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Bibliographic Details
Main Authors: Apyan, Aram, Barbieri, Richard Alexander, Busza, Wit, Cali, Ivan Amos, Chan, M., Di Matteo, Leonardo, Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Lee, Yen-Jie, Ma, Teng, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Stoeckli, Fabian, Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Zanetti, Marco, Roland, Christof E, Roland, Gunther M, Sumorok, Konstanty C, Yang, Mingming, Wyslouch, Victoria, Bauer, Gerry P, Levin, Andrew Michael, Luckey Jr, P David
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag Berlin Heidelberg 2014
Online Access:http://hdl.handle.net/1721.1/91158
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/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary:Production of prompt J/ψ meson pairs in proton-proton collisions at s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb[superscript −1]. The two J/ψ mesons are fully reconstructed via their decays into μ + μ − pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (p[subscript T][superscript J/ψ] ) and rapidity (|y [superscript J/ψ] |): |y [superscript J/ψ] | < 1.2 for p T[superscript J/ψ] > 6.5 GeV/c; 1.2 < |y [superscript J/ψ] | < 1.43 for a p T threshold that scales linearly with |y [superscript J/ψ] | from 6.5 to 4.5 GeV/c; and 1.43 < |y[superscript J/ψ] | < 2.2 for p [subscript T] [superscript J/ψ] > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%.

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