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T.Tsaregorodtsev, A.Tuning, N.Ukleja, A.Urquijo, P.Uwer, U.Vagnoni, V.Valenti, G.Vazquez Gomez, R.Vazquez Regueiro, P.Vecchi, S.Velthuis, J. J.Veltri, M.Vervink, K.Viaud, B.Videau, I.Vilasis-Cardona, X.Visniakov, J.Vollhardt, A.Voong, D.Vorobyev, A.Voss, H.Wacker, K.Wandernoth, S.Wang, J.Ward, D. R.Webber, A. D.Websdale, D.Whitehead, M.Wiedner, D.Wiggers, L.Wilkinson, G.Williams, M. P.Williams, M.Wilson, F. F.Wishahi, J.Witek, M.Witzeling, W.Wotton, S. A.Wyllie, K.Xie, Y.Xing, F.Yang, Z.Young, R.Yushchenko, O.Zavertyaev, M.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zhong, L.Zverev, E.Zvyagin, A.2012-03-082012-03-082012-03-08201210.1016/j.physletb.2011.12.015https://infoscience.epfl.ch/handle/20.500.14299/78515WOS:000299757000007The production of J/psi pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb(-1) collected with the LHCb detector. The production cross-section for pairs with both J/psi in the rapidity range 2 < y(J/psi) < 4.5 and transverse momentum p(T)(J/psi) < 10 GeV/c isPsi-Psi-ProductionMeson ProductionUpsilontext::journal::journal article::research article