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Vasilishin, B. Ketzer, B. Marianski, B.M. Veit, B. Parsamyan, B. Ventura, C. Chatterjee, C.D.R. Azevedo, C. Franco, Ch. Dreisbach, C. Naim, C. Quintans, C. Riedl, C.-Y. Hsieh, D. D'Ago, D.I. Ryabchikov, D. Neyret, D. Panzieri, D. Steffen, D. von Harrach, D.V. Peshekhonov, E. Kabuss, E. Mitrofanov, E. Zemlyanichkina, F. Balestra, F. Bradamante, F. Gautheron, F. Herrmann, F. Kaspar, F. Klein, F. Krinner, F. Kunne, F. Tessarotto, F. Tosello, G.D. Alexeev, G.K. Mallot, G. Mattson, G. Nukazuka, G. Reicherz, G. Sbrizzai, G.V. Khaustov, G.V. Meshcheryakov, H. Fischer, H. Pekeler, H. Schmieden, H. Suzuki, I.A. Savin, I. Denisenko, I. Gnesi, I. Konorov, J. Barth, J. Berenguer Antequera, J. Bernhard, J.-C. Peng, J. Giarra, J.H. Koivuniemi, J. Lichtenstadt, J. Marzec, J. Matousek, J.M. Friedrich, J. Novy, J. Pochodzalla, J. Pretz, J. Smolik, J. Tomsa, J. Veloso, K. Augsten, K. Kondo, K. Kurek, K. Lavickova, K. Zaremba, L. Sinha, M. Ball, M. Bodlak, M. Chiosso, M. Faessler, M. Finger, M. Finger Jr., M.G. Alexeev, M. Gorzellik, M. Grosse Perdekamp, M. Jandek, M.L. Crespo, M. Meyer, M. Mikhasenko, M. Ostrick, M. Pesek, M. Peskova, M. Quaresma, M. Slunecka, M. Stolarski, M. Sulc, M. Virius, M. Wagner, M. Zavertyaev, M. Zemko, M. Ziembicki, N. d'Hose, N. Doshita, N. Horikawa, N. Makins, N. Makke, N. Mitrofanov, N. Pierre, O.M. Kouznetsov, O.P. Gavrichtchouk, O. Subrt, O.Yu. Denisov, P.D. Eversheim, P. Faccioli, P.-J. Lin, P. Joerg, P.M.M. Correia, P. Sznajder, P. Zavada, R. Beck, R. Heitz, R. Joosten, R. Longo, R.P. Kurjata, R.R. Dusaev, S.A. Mamon, S. Dalla Torre, S. Dasgupta, S. Gerassimov, S. Huber, S. Ishimoto, S. Levorato, S. Paul, S. Platchkov, S. Sarkar, S.S. Dasgupta, S. Tessaro, S.-U. Chung, S. Uhl, S.V. Donskov, S. Wallner, T. Iwata, T. Jary, T. Matsuda, T. Rudnicki, V. Andrieux, V. Anosov, V.A. Polyakov, V.D. Samoylenko, V.E. Burtsev, V.E. Lyubovitskij, V.F. Konstantinov, V. Frolov, V.N. Kolosov, V. Tskhay, W. Augustyniak, W.-C. Chang, W.-D. Nowak, W. Duennweber, W. Meyer, Y. Bedfer, Y. Kulinich, Y. Miyachi, Y.-S. Lian, Yu.A. Khokhlov, Yu. Kisselev, Yu.V. Mikhailov, Y. Zhao, Z. Kral","submitted_at":"2020-06-09T15:22:03Z","abstract_excerpt":"The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\\pi$. With a mass too close to and a width smaller than the axial-vector ground state $a_1(1260)$, it was immediately interpreted as a new light exotic meson, similar to the $X$, $Y$, $Z$ states in the hidden-charm sector. 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