First Observation of an Exotic Reggeon
G. D. Alexeev, M. G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C. D. R. Azevedo, B. Badelek, R. Beck, J. Beckers, Y. Bedfer, V. Benesova, J. Bernhard, F. Bradamante, A. Bressan, W. -C. Chang, C. Chatterjee, M. Chiosso, S. -U. Chung, A. Cicuttin, M. L. Crespo, D. D'Ago, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, F. Delcarro, I. Denisenko, O. Yu. Denisov, S. V. Donskov, N. Doshita, Ch. Dreisbach, W. Dunnweber, R. R. Dusaev, D. Ecker, P. Faccioli, M. Faessler, M. Finger, M. jr Finger, H. Fischer, K. J. Flothner, W. Florian, J. M. Friedrich, V. Frolov, L. G. Garcia Ordonez, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Gruner, A. Guskov, P. Haas, D. von Harrach, M. Hoffmann, N. d'Hose, C. -Y. Hsieh, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, E. Jelinkova, R. Joosten, E. Kabuss, F. Kaspar, A. Kerbizi, B. Ketzer, G. V. Khaustov, T. Klasek, J. H. Koivuniemi, V. N. Kolosov, K. Kondo Horikawa, I. Konorov, A. Yu. Korzenev, A. M. Kotzinian, O. M. Kouznetsov, A. Koval, F. Kunne, K. Kurek, R. P. Kurjata, G. Kurten, A. Kveton, K. Lavickova, S. Levorato, Y. -S. Lian, J. Lichtenstadt, P. -J. Lin, R. Longo, V. E. Lyubovitskij, A. Maggiora, N. Makke, G. K. Mallot, A. Maltsev, A. Martin, J. Marzec, J. Matousek, T. Matsuda, C. Menezes Pires, F. Metzger, W. Meyer, M. Mikhasenko, E. Mitrofanov, D. Miura, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, D. Neyret, M. Niemiec, J. Novy, W. -D. Nowak, G. Nukazuka, A. G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J. -C. Peng, M. Pesek, D. V. Peshekhonov, M. Peskova, S. Platchkov, J. Pochodzalla, V. A. Polyakov, P. Pucci, C. Quintans, G. Reicherz, C. Riedl, D. I. Ryabchikov, A. Rychter, A. Rymbekova, V. D. Samoylenko, A. Sandacz, S. Sarkar, I. A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, S. Seriubin, L. Sinha, D. Spulbeck, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, F. Tosello, A. Townsend, V. Tskhay, B. Valinoti, B. M. Veit, J. F. C. A. Veloso, A. Vijayakumar, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, M. Ziembicki, for the COMPASS Collaboration, C. Fernandez-Ramirez, M. Mikhasenko, L. Bibrzycki, G. Foti, N. Hammoud, V. Mathieu, G. Montana, R. J. Perry, A. Pilloni, A. Rodas, V. Shastry, W. A. Smith, A. P. Szczepaniak, D. Winney, for JPAC Collaboration
Abstract
We present new high-statistics measurements of the peripheral production of ηπ- and η π- pairs in the reactions π- p η()π- p. For the first time, we perform an unbinned analysis of the high-mass region of the ηπ- and ηπ- systems, which allows us to disentangle the exchange mechanisms governing their production. We report the first observation in high-energy scattering of an exotic Reggeon with high significance exceeding 5\,σ for both channels, which is, most likely, related to the exotic π1(1600).8
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