@article{3075367,
    title = "Observation of vertex factorisation breaking in central pp interactions",
    author = "Barberis, D. and Beusch, W. and Binon, F.G. and Carney, J.N. and Di Bari, D. and Dolgopolov, A.V. and Donskov, S.V. and Earl, B.C. and Elia, D. and Evans, D. and Fini, R. and French, B.R. and Ghidini, B. and Inaba, S. and Inyakin, A.V. and Jacholkowski, A. and Khaustov, G.V. and Kinashi, T. and Kinson, J.B. and Kirk, A. and Klempt, W. and Kobayashi, M. and Kondashov, A.A. and Kulchitsky, Y. and Lednev, A.A. and Lenti, V. and Lishin, V.A. and Loconsole, R.A. and Maljukov, S. and Manzari, V. and Martinengo, P. and Minashvili, I. and Nakagawa, T. and Navach, F. and Norman, K.L. and Peigneux, J.P. and Polovnikov, S.A. and Polyakov, V.A. and Prokoshkin, Yu.D. and Romanovsky, V. and Rotscheidt, H. and Russakovich, N. and Samoylenko, V.D. and Semenov, A. and Sené, M. and Sené, R. and Shagin, P.M. and Shimizu, H. and Shtannikov, A.V. and Singovsky, A.V. and Solovjev, A. and Stroot, J.P. and Sugonyaev, V.P. and Takamatsu, K. and Tchlatchidze, G. and Tsuru, T. and Vassiliadis, G. and Venables, M. and Villalobos Baillie, O. and Votruba, M.F. and Yasu, Y.",
    journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
    year = "1996",
    volume = "388",
    number = "4",
    pages = "853-858",
    doi = "10.1016/S0370-2693(96)01316-0",
    abstract = "Central π+ π- events produced in pp interactions are studied in terms of correlations between the outgoing protons. It is observed there is more ρ0(770) and f2(1270) production in reactions where the outgoing protons are on opposite sides of the beam. This effect is not attributable to the trigger or the experimental acceptance, and suggests that the vertices do not factorise."
}