First Measurement of Chiral Dynamics in π^- γ-&gt; π^- π^- π^+
Creators: name: Alekseev, M. G.
name: Alexakhin, V. Yu.
name: Alexandrov, Yu.
name: Alexeev, G. D.
name: Amoroso, A.
name: Austregesilo, A.
name: Badelek, B.
name: Balestra, F.
name: Barth, J.
name: Baum, G.
name: Bedfer, Y.
name: Bernhard, J.
name: Bertini, R.
name: Bettinelli, M.
name: Bicker, K.
name: Birsa, R.
name: Bisplinghoff, J.
name: Bordalo, P.
name: Bradamante, F.
name: Bravar, A.
name: Bressan, A.
name: Burtin, E.
name: Chaberny, D.
name: Chiosso, M.
name: Chung, S. U.
name: Cicuttin, A.
name: Crespo, M. L.
name: Torre, S. Dalla
name: Das, S.
name: Dasgupta, S. S.
name: Denisov, O. Yu.
name: Dhara, L.
name: Donskov, S. V.
name: Doshita, N.
name: Duic, V.
name: Dünnweber, W.
name: Dziewiecki, M.
name: Efremov, A.
name: Eversheim, P. D.
name: Eyrich, W.
name: Faessler, M.
name: Ferrero, A.
name: Filin, A.
name: Finger, M.
name: Finger, M.
name: Fischer, H.
name: Franco, C.
name: von Hohenesche, N. du Fresne
name: Friedrich, J. M.
name: Garfagnini, R.
name: Gautheron, F.
name: Gavrichtchouk, O. P.
name: Gazda, R.
name: Gerassimov, S.
name: Geyer, R.
name: Giorgi, M.
name: Gnesi, I.
name: Gobbo, B.
name: Goertz, S.
name: uller, S. Grabm\"
name: Grasso, A.
name: Grube, B.
name: Gushterski, R.
name: Guskov, A.
name: Haas, F.
name: von Harrach, D.
name: Hasegawa, T.
name: Heinsius, F. H.
name: Herrmann, F.
name: Hess, C.
name: Hinterberger, F.
name: Horikawa, N.
name: Höppner, Ch.
name: d'Hose, N.
name: Huber, S.
name: Ishimoto, S.
name: Ivanov, O.
name: Ivanshin, Yu.
name: Iwata, T.
name: Jahn, R.
name: Jasinski, P.
name: Jegou, G.
name: Joosten, R.
name: Kabuss, E.
name: Kang, D.
name: Ketzer, B.
name: Khaustov, G. V.
name: Khokhlov, Yu. A.
name: Kisselev, Yu.
name: Klein, F.
name: Klimaszewski, K.
name: Koblitz, S.
name: Koivuniemi, J. H.
name: Kolosov, V. N.
name: Kondo, K.
name: Königsmann, K.
name: Konorov, I.
name: Konstantinov, V. F.
name: Korzenev, A.
name: Kotzinian, A. M.
name: Kouznetsov, O.
name: Krämer, M.
name: Kroumchtein, Z. V.
name: Kunne, F.
name: Kurek, K.
name: Lauser, L.
name: Lednev, A. A.
name: Lehmann, A.
name: Levorato, S.
name: Lichtenstadt, J.
name: Maggiora, A.
name: Magnon, A.
name: Makke, N.
name: Mallot, G. K.
name: Mann, A.
name: Marchand, C.
name: Martin, A.
name: Marzec, J.
name: Massmann, F.
name: Matsuda, T.
name: Meyer, W.
name: Michigami, T.
name: Mikhailov, Yu. V.
name: Moinester, M. A.
name: Morreale, A.
name: Mutter, A.
name: Nagaytsev, A.
name: Nagel, T.
name: Nerling, F.
name: Neubert, S.
name: Neyret, D.
name: Nikolaenko, V. I.
name: Nowak, W. -D.
name: Nunes, A. S.
name: Olshevsky, A. G.
name: Ostrick, M.
name: Padee, A.
name: Panknin, R.
name: Panzieri, D.
name: Parsamyan, B.
name: Paul, S.
name: Perevalova, E.
name: Pesaro, G.
name: Peshekhonov, D. V.
name: Piragino, G.
name: Platchkov, S.
name: Pochodzalla, J.
name: Polak, J.
name: Polyakov, V. A.
name: Pontecorvo, G.
name: Pretz, J.
name: Quintans, C.
name: Rajotte, J. -F.
name: Ramos, S.
name: Rapatsky, V.
name: Reicherz, G.
name: Richter, A.
name: Rocco, E.
name: Rondio, E.
name: Ryabchikov, D. I.
name: Samoylenko, V. D.
name: Sandacz, A.
name: Santos, H.
name: Sapozhnikov, M. G.
name: Sarkar, S.
name: Savin, I. A.
name: Sbrizzai, G.
name: Schiavon, P.
name: Schill, C.
name: Schlüter, T.
name: Schmitt, L.
name: Schopferer, S.
name: Schröder, W.
name: Shevchenko, O. Yu.
name: Siebert, H. -W.
name: Silva, L.
name: Sinha, L.
name: Sissakian, A. N.
name: Slunecka, M.
name: Smirnov, G. I.
name: Sosio, S.
name: Sozzi, F.
name: Srnka, A.
name: Stolarski, M.
name: Sulc, M.
name: Sulej, R.
name: Sznajder, P.
name: Takekawa, S.
name: Tessaro, S.
name: Tessarotto, F.
name: Teufel, A.
name: Tkatchev, L. G.
name: Uhl, S.
name: Uman, I.
name: Vandenbroucke, M.
name: Virius, M.
name: Vlassov, N. V.
name: Windmolders, R.
name: Wiślicki, W.
name: Wollny, H.
name: Zaremba, K.
name: Zavertyaev, M.
name: Zemlyanichkina, E.
name: Ziembicki, M.
name: Zhuravlev, N.
name: Zvyagin, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The COMPASS collaboration at CERN has investigated the π^- γ-&gt; π^- π^- π^+ reaction at center-of-momentum energy below five pion masses, sqrt(s) &lt; 5 m(π), embedded in the Primakoff reaction of 190 GeV pions impinging on a lead target. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, t' &lt; 0.001 (GeV/c)^2. Using partial-wave analysis techniques, the scattering intensity of Coulomb production described in terms of chiral dynamics and its dependence on the 3π-invariant mass m(3π) = sqrt(s) were extracted. The absolute cross section was determined in seven bins of $\sqrt{s}$ with an overall precision of 20%. At leading order, the result is found to be in good agreement with the prediction of chiral perturbation theory over the whole energy range investigated.
description: 10 pages, 5 figures