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    Jackura, A.; Fernández-Ramírez, C.; Pilloni, A.; Fox, G.; Aghasyan, M.; Akhunzyanov, R.; Andrieux, V.; Augustyniak, W.; Ball, M.; Birsa, R.; Bordalo, P.; Bressan, A.; Chang, W.-C.; Chiosso, M.; Choi, I.; Chumakov, A.G.; Chung, S.-U.; Cicuttin, A.; Dasgupta, S.S.; Denisov, O.Yu; Dhara, L.; Doshita, N.; Dziewiecki, M.; Efremov, A.; Faessler, M.; Ferrero, A.; Fischer, H.; du Fresne von Hohenesche, N.; Friedrich, J.M.; Fuchey, E.; Gerassimov, S.; Giordano, F.; Gnesi, I.; Gorzellik, M.; Grasso, A.; Grosse Perdekamp, M.; Grube, B.; Grussenmeyer, T.; Herrmann, F.; d'Hose, N.; Iwata, T.; Jary, V.; Joosten, R.; Jörg, P.; Khokhlov, Yu.A.; Kisselev, Yu; Klein, F.; Kolosov, V.N.; Königsmann, K.; Konstantinov, V.F.; Kouznetsov, O.M.; Kral, Z.; Kremser, P.; Kroumchtein, Z.V.; Kulinich, Y.; Kurjata, R.P.; Kveton, A.; Lednev, A.A.; Levillain, M.; Levorato, S.; Lyubovitskij, V.E.; Maggiora, A.; Magnon, A.; Makke, N.; Mamon, S.A.; Matsuda, H.; Matsuda, T.; Meyer, M.; Mitrofanov, E.; Nerling, F.; Neyret, D.; Nový, J.; Nowak, W.-D.; Nunes, A.S.; Ostrick, M.; Panzieri, D.; Pereira, F.; Pešková, M.; Pochodzalla, J.; Polyakov, V.A.; Pretz, J.; Quaresma, M.; Regali, C.; Reicherz, G.; Riedl, C.; Rybnikov, A.; Samoylenko, V.D.; Schiavon, P.; Schmieden, H.; Schönning, K.; Seder, E.; Silva, L.; Stolarski, M.; Sznajder, P.; Thiel, A.; Vasilishin, B.I.; Veloso, J.; ter Wolbeek, J.; Zavertyaev, M.; Ziembicki, M.

    Physics letters. B, 04/2018, Letnik: 779, Številka: C
    Journal Article

    We present a new amplitude analysis of the ηπ D-wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.