{"paper":{"title":"Measurement of the charged-pion polarisability","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ex","authors_text":"A.A. Lednev, A. Amoroso, A. Austregesilo, A. Berlin, A. Bressan, A. Cicuttin, A. Efremov, A. Ferrero, A. Filin, A.G. Olshevsky, A. Grasso, A. Guskov, A. Ivanov, A. Lehmann, A. Maggiora, A. Magnon, A. Martin, A.M. Dinkelbach, A.M. Kotzinian, A. Nagaytsev, A. Rychter, A. Sandacz, A.S. Nunes, A. Srnka, A. Szabelski, A. Zink, B. Badelek, B. Gobbo, B. Grube, B. Ketzer, B. Parsamyan, C. Adolph, C. Braun, C. Elia, C. Franco, Ch. Hoeppner, C. Marchand, C. Quintans, C. Regali, C. Schill, D. Hahne, D.I. Ryabchikov, D. Neyret, D. Panzieri, D. Peshekhonov, D. von Harrach, E. Burtin, E. Kabuss, E. Rocco, E. Zemlyanichkina, F. Balestra, F. Bradamante, F. Gautheron, F. Haas, F. Herrmann, F.H. Heinsius, F. Hinterberger, F. Klein, F. Kunne, F. Nerling, F. Sozzi, F. Tessarotto, F. Thibaud, G. Baum, G.D. Alexeev, G.K. Mallot, G. Meshcheryakov, G. Reicherz, G. Sbrizzai, G.V. Khaustov, H. Fischer, H. Matsuda, H. Schmieden, H. Suzuki, H. Wollny, I.A. Savin, I. Gnesi, I. Konorov, I. Orlov, I. Uman, J. Barth, J. Bernhard, J. Bieling, J. Bisplinghoff, J.H. Koivuniemi, J. Lichtenstadt, J. Marzec, J. Matousek, J.M. Friedrich, J. Novy, J. Pochodzalla, J. Pretz, J. Ter Wolbeek, K. Bicker, K. Klimaszewski, K. Koenigsmann, K. Kondo, K. Kurek, K. Schmidt, K. Schoenning, K. Zaremba, L. Capozza, L. Silva, L. Sinha, L. Steiger, L. Wang, M.A. Moinester, M. Bodlak, M. Boer, M. Buechele, M. Chiosso, M. Colantoni, M. Dziewiecki, M. Faessler, M. Finger, M.G. Alexeev, M. Gorzellik, M. jr. Finger, M. Kraemer, M.L. Crespo, M. Levillain, M. Ostrick, M. Quaresma, M. Schott, M. Slunecka, M. Stolarski, M. Sulc, M. Virius, M. Wilfert, M. Zavertyaev, M. Ziembicki, N. d'Hose, N. Doshita, N. du Fresne von Hohenesche, N. Horikawa, N. Kuchinski, N. Makke, N.S. Rossiyskaya, O. Kouznetsov, O.P. Gavrichtchouk, O.Yu. Denisov, O.Yu. Shevchenko, P. Bordalo, P.D. Eversheim, P. Jasinski, P. Joerg, P. Schiavon, P. Sznajder, Q. Curiel, R. Akhunzyanov, R. Beck, R. Birsa, R. Geyer, R. Hashimoto, R. Jahn, R. Joosten, R. Kuhn, R. Panknin, R.P. Kurjata, R. Sulej, R. Windmolders, S. Dalla Torre, S. Dasgupta, S. Gerassimov, S. Goertz, S. Grabmueller, S. Huber, S. Ishimoto, S. Levorato, S. Neubert, S. Paul, S. Platchkov, S. Ramos, S. Sarkar, S. Schopferer, S.S. Dasgupta, S. Sirtl, S. Sosio, S. Takekawa, S. Tessaro, S.U. Chung, S. Uhl, S.V. Donskov, T. Grussenmeyer, T. Guthoerl, T. Iwata, T. Matsuda, T. Michigami, T. Nagel, T. Schlueter, T. Szameitat, T. Weisrock, V. Andrieux, V. Anosov, V.A. Polyakov, V.D. Samoylenko, V. Duic, V.F. Konstantinov, V. Frolov, V.I. Nikolaenko, V. Jary, V.N. Kolosov, W.-D. Nowak, W. Duennweber, W. Eyrich, W. Meyer, Y. Bedfer, Y. Miyachi, Yu.A. Khokhlov, Yu. Ivanshin, Yu. Kisselev, Yu.V. Mikhailov, Z.V. Kroumchtein","submitted_at":"2014-05-25T11:35:08Z","abstract_excerpt":"The COMPASS collaboration at CERN has investigated pion Compton scattering, $\\pi^-\\gamma\\rightarrow \\pi^-\\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\\pi^-\\mathrm{Ni}\\rightarrow\\pi^-\\gamma\\;\\mathrm{Ni}$, which is initiated by 190\\,GeV pions impinging on a nickel target. The exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $Q^2<0.0015$\\,(GeV/$c$)$^2$. From a sample of 63\\,000 events the pion electric polarisability is determined to be $\\alpha_\\pi\\ =\\ (\\,2.0\\ \\pm\\ 0.6_{\\mbo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.6377","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"}