{"paper":{"title":"Search for muoproduction of $X(3872)$ at COMPASS and indication of a new state $\\widetilde{X}(3872)$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.A. Lednev, A. Amoroso, A. Antoshkin, A. Austregesilo, A. Bressan, A. Cicuttin, A. Efremov, A. Ferrero, A.G. Chumakov, A.G. Olshevsky, A. Grasso, A. Gridin, A. Guskov, A. Ivanov, A. Kerbizi, A. Kveton, A. Maggiora, A. Magnon, A. Martin, A.M. Kotzinian, A. Nagaytsev, A. Rybnikov, A. Rychter, A. Sandacz, A. Selyunin, A.S. Nunes, A. Srnka, A. Szabelski, A. Thiel, A. Vauth, A.Vidon, B. Badelek, B. Grube, B.I. Vasilishin, B. Ketzer, B. Marianski, B. Parsamyan, C. Chatterjee, C.D.R. Azevedo, C. Franco, Ch. Dreisbach, C. Quintans, C. Regali, C. Riedl, C. Santos, C.-Y. Hsieh, D. Hahne, D.I. Ryabchikov, D. Neyret, D. Panzieri, D. Steffen, D. von Harrach, D.V. Peshekhonov, E.A. Levchenko, E. Fuchey, E. Kabuss, E. Mitrofanov, E. R. Bielert, E. Seder, E. Zemlyanichkina, F. Balestra, F. Bradamante, F. Gautheron, F. Giordano, F. Herrmann, F.H. Heinsius, F. Klein, F. Krinner, F. Kunne, F. Nerling, F. Pereira, F. Tessarotto, F. Tosello, G.D. Alexeev, G. Hamar, G.K. Mallot, G. Nukazuka, G. Reicherz, G. Sbrizzai, G.V. Khaustov, G.V. Meshcheryakov, H. Fischer, H. Matsuda, H. Schmieden, H. Suzuki, I.A. Savin, I. Choi, I. Gnesi, I.I. Kuznetsov, I. Konorov, I. Orlov, J. Barth, 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. Ter Wolbeek, J. Tomsa, J. Veloso, K. Augsten, K. Bicker, K. Koenigsmann, K. Kondo, K. Kurek, K. Schmidt, K. Schoenning, K. Zaremba, L. Dhara, L. Silva, L. Sinha, M. Aghasyan, M. Ball, M. Bodlak, M. Buechele, M. Chiosso, M. Dziewiecki, M. Faessler, M. Finger, M. Finger Jr., M.G. Alexeev, M. Gorzellik, M. Grosse Perdekamp, M. Kraemer, M.L. Crespo, M. Levillain, M. Meyer, M. Mikhasenko, M. Ostrick, M. Pesek, M. Peskova, M. Quaresma, M. Slunecka, M. Stolarski, M. Sulc, M. Tasevsky, M. Virius, M. Wilfert, M. Zavertyaev, M. Ziembicki, N. d'Hose, N. Doshita, N. du Fresne von Hohenesche, N. Horikawa, N. Makins, N. Makke, N. Mitrofanov, N. Pierre, N.S. Rogacheva, N.V. Anfimov, N. Zhuravlev, O.M. Kouznetsov, O.P. Gavrichtchouk, O. Subrt, O.Yu. Denisov, P. Bordalo, P.D. Eversheim, P. Joerg, P. Kremser, P. Schiavon, P. Sznajder, P. Zavada, R. Akhunzyanov, R. Beck, R. Birsa, R. Heitz, R. Joosten, R. Longo, R.P. Kurjata, R.R. Dusaev, R. Salac, S.A. Mamon, S. Dalla Torre, S. Dasgupta, S. Gerassimov, S. Huber, S. Ishimoto, S. Levorato, S. Paul, S. Platchkov, S. Ramos, S. Sarkar, S.S. Dasgupta, S. Sirtl, S. Tessaro, S.-U. Chung, S. Uhl, S.V. Donskov, S. Wallner, T. Grussenmeyer, T. Iwata, T. Matsuda, T. Sawada, T. Szameitat, T. Weisrock, V. Andrieux, V. Anosov, V.A. Polyakov, V.D. Samoylenko, V.E. Burtsev, V.E. Lyubovitskij, V.F. Konstantinov, V. Frolov, V. Jary, 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. Ivanshin, Yu. Kisselev, Yu.V. Mikhailov, Z. Kral, Z.V. Kroumchtein","submitted_at":"2017-07-06T13:58:47Z","abstract_excerpt":"We have searched for exclusive production of exotic charmonia in the reaction $\\mu^+~N \\rightarrow \\mu^+ (J\\!/\\!\\psi\\pi^+\\pi^-)\\pi^{\\pm}~N'$ using COMPASS data collected with incoming muons of 160 GeV/$c$ and 200 GeV/$c$ momentum. In the $J\\!/\\!\\psi\\pi^+\\pi^-$ mass distribution we observe a signal with a statistical significance of 4.1 $\\sigma$. Its mass and width are consistent with those of the $X(3872)$. The shape of the $\\pi^+\\pi^-$ mass distribution from the observed decay into $J\\!/\\!\\psi\\pi^+\\pi^-$ shows disagreement with previous observations for $X(3872)$. The observed signal may be i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.01796","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}