@article{3162944,
    title = "Measurement of prompt J/psi pair production in pp collisions at root s =
7 Tev",
    author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and and Bergauer, T. and Dragicevic, M. and Eroe, J. and Fabjan, C. and Friedl, and M. and Fruehwirth, R. and Ghete, V. M. and Hartl, C. and Hoermann, N. and and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knuenz, V. and and Krammer, M. and Kraetschmer, I. and Liko, D. and Mikulec, I. and Rabady, and D. and Rahbaran, B. and Rohringer, H. and Schoefbeck, R. and Strauss, J. and and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and and Wulz, C. -E. and Mossolov, V. and Shumeiko, N. and Gonzalez, J. Suarez and and Alderweireldt, S. and Bansal, M. and Bansal, S. and Cornelis, T. and and DeWolf, E. A. and Janssen, X. and Knutsson, A. and Luyckx, S. and and Ochesanu, S. and Roland, B. and Rougny, R. and De Klundert, M. Van and and Van Haevermaet, H. and Van Mechelen, P. and Van Remortel, N. and Van and Spilbeeck, A. and Blekman, F. and Blyweert, S. and D'Hondt, J. and Daci, and N. and Heracleous, N. and Keaveney, J. and Kim, T. J. and Lowette, S. and and Maes, M. and Olbrechts, A. and Python, Q. and Strom, D. and and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and Van Onsem, G. and P. and Villella, I. and Caillol, C. and Clerbaux, B. and De Lentdecker, and G. and Dobur, D. and Favart, L. and Gay, A. P. R. and Grebenyuk, A. and and Leonard, A. and Mohammadi, A. and Pernie, L. and Reis, T. and Seva, T. and and Thomas, L. and Velde, C. Vander and Vanlaer, P. and Wang, J. and and Adler, V. and Beernaert, K. and Benucci, L. and Cimmino, A. and and Costantini, S. and Crucy, S. and Dildick, S. and Fagot, A. and Garcia, and G. and Mccartin, J. and Rios, A. A. Ocampo and Ryckbosch, D. and Diblen, and S. Salva and Sigamani, M. and Strobbe, N. and Thyssen, F. and Tytgat, M. and and Yazgan, E. and Zaganidis, N. and Basegmez, S. and Beluffi, C. and and Bruno, G. and Castello, R. and Caudron, A. and Ceard, L. and Da and Silveira, G. G. and Delaere, C. and du Pree, T. and Favart, D. and and Forthomme, L. and Giammanco, A. and Hollar, J. and Jez, P. and Komm, M. and and Lemaitre, V. and Liao, J. and Nuttens, C. and Pagano, D. and and Perrini, L. and Pin, A. and Piotrzkowski, K. and Popov, A. and and Quertenmont, L. and Selvaggi, M. and Marono, M. Vidal and Garcia, J. M. and Vizan and Beliy, N. and Caebergs, T. and Daubie, E. and Hammad, G. H. and and Alda Junior, W. L. and Alves, G. A. and Correa Martins Junior, M. and and Dos Reis Martins, T. and Pol, M. E. and Carvalho, W. and Chinellato, and J. and Custodio, A. and Da Costa, E. 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H. and and Woods, N. and CMS Collaboration",
    journal = "Journal of High Energy Physics",
    year = "2014",
    number = "9",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP09(2014)094",
    keywords = "Hadron-Hadron Scattering; B physics",
    abstract = "Production of prompt J/psi meson pairs in proton-proton collisions at
root 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(-1).
The two J/psi mesons are fully reconstructed via their decays into
mu(+)mu(-) pairs. This observation provides for the first time access to
the high-transverse-momentum region of J/psi 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/psi
transverse momentum (p(T)(J/psi)) and rapidity (vertical bar
y(J/psi)vertical bar): vertical bar y(J/psi)vertical bar < 1.2 for
p(T)(J/psi) > 6.5 GeV/c; 1.2 < vertical bar y(J/psi)vertical bar < 1.43
for a pT threshold that scales linearly with vertical bar
y(J/psi)vertical bar from 6.5 to 4.5 GeV/c; and 1.43 < vertical bar
y(J/psi)vertical bar < 2.2 for p(T)(J/psi) > 4.5 GeV/c. The total cross
section, assuming unpolarized prompt J/psi pair production is 1.49 +/-
0.07 (stat) +/- 0.13 (syst) nb. Different assumptions about the J/psi
polarization imply modifications to the cross section ranging from -31%
to +27%."
}