@article{3175011,
    title = "Observation of gamma(1S) pair production in proton-proton collisions at
root s=8 TeV",
    author = "Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and and Asilar, E. and Bergauer, T. and Brandstetter, J. and Brondolin, E. and and Dragicevic, M. and Eroe, J. and Flechl, M. and Friedl, M. and and Fruehwirth, R. and Ghete, V. M. and Hartl, C. and Hoermann, N. and and Hrubec, J. and Jeitler, M. and Koenig, A. and Kraetschmer, I. and Liko, and D. and Matsushita, T. and Mikulec, I. and Rabady, D. and Rad, N. and and Rahbaran, B. and Rohringer, H. and Schiecki, J. and Strauss, J. and and Waltenberger, W. and Wulz, C. -E. and Dvornikov, O. and Makarenko, V. and and Zykunov, V. and Mossolov, V. and Shumeiko, N. and Gonzalez, J. and Suarez and Alderweireldt, S. and De Wolf, E. A. and Janssen, X. and and Lauwers, J. and De Klundert, M. Van and Van Haevermaet, H. and Van and Mechelen, P. and Van Remortel, N. and Van Spilbeeck, A. and Abu Zeid, S. and and Blekman, F. and D'Hondt, J. and Daci, N. and De Bruyn, I. and and Deroover, K. and Lowette, S. and Moortgat, S. and Moreels, L. and and Olbrechts, A. and Python, Q. and Tavernier, S. and Van Doninck, W. and and Van Mulders, P. and Van Parijs, I. and Brun, H. and Clerbaux, B. and De and Lentdecker, G. and Delannoy, H. and Fasanella, G. and Favart, L. and and Goldouzian, R. and Grebenyuk, A. and Karapostoli, G. and Lenzi, T. and and Leonard, A. and Luetic, J. and Maer-Schalk, T. and Marinov, A. and and Randle-conde, A. and Seva, T. and Velde, C. Vander and Vanlaer, P. and and Yonamine, R. and Zenoni, F. and Zhang, F. and Cimmino, A. and Cornelis, and T. and Dobur, D. and Fagot, A. and Garcia, G. and Gul, M. and and Khvastunov, I. and Poyraz, D. and Salva, S. and Schofbeck, R. and and Sharma, A. and Tytgat, M. and Van Driessche, W. and Yazgan, E. and and Zaganidis, N. and Bakhshiansohi, H. and Beluffi, C. and Bondu, . and and Brochet, S. and Bruno, G. and Caudron, A. and De Visscher, S. and and Delaere, C. and Delcourt, M. and Francois, B. and Giammanco, A. and and Jafari, A. and Jez, P. and Komm, M. and Lemaitre, V. and Magitteri, A. and and Mertens, A. and Musich, M. and Nuttens, C. and Piotrzkowski, K. and and Quertenmont, L. and Selvaggi, M. and Marono, M. Vidal and Wertz, S. and and Beliy, N. and Alda Junior, W. L. and Alves, F. L. and Alves, G. A. and and Brito, L. and Hensel, C. and Moraes, A. and Pol, M. 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    journal = "Journal of High Energy Physics",
    year = "2017",
    number = "5",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP05(2017)013",
    keywords = "Hadron-Hadron scattering (experiments); Quarkonium",
    abstract = "Pair production of gamma(1S) mesons is observed at the LHC in
proton-proton collisions at root s = 8 TeV by the CMS experiment in a
data sample corresponding to an integrated luminosity of 20.7 fb(-1).
Both gamma(1S) candidates are fully reconstructed via their decays to
mu(+) mu(-). The fiducial acceptance region is defined by an absolute
gamma(1S) rapidity smaller than 2.0. The fiducial cross section for the
production of gamma(1S) pairs, assuming that both mesons decay
isotropically, is measured to be 68.8 +/- 12.7 (stat) +/- 7.4 (syst) +/-
2.8 (B) pb, where the third uncertainty comes from the uncertainty in
the branching fraction of gamma(1S) decays to mu(+) mu(-). Assuming
instead that the gamma(1S) mesons are produced with different
polarizations leads to variations in the measured cross section in the
range from 38% to +36%."
}