First Measurement of Chiral Dynamics in $\pi^-\gamma \to \pi^-\pi^-\pi^+$
- Adolph, C.
- Alekseev, M.G.
- Alexakhin, V.Yu.
- Alexandrov, Yu.
- Alexeev, G.D.
- Amoroso, A.
- Antonov, A.A.
- Austregesilo, A.
- Badelek, B.
- Balestra, F.
- Barth, J.
- Baum, G.
- Bedfer, Y.
- Bernhard, J.
- Bertini, R.
- Bettinelli, M.
- Bicker, K.A.
- Birsa, R.
- Bisplinghoff, J.
- Bordalo, P.
- Bradamante, F.
- Braun, C.
- Bravar, A.
- Bressan, A.
- Burtin, E.
- Chaberny, D.
- Chiosso, M.
- Chung, S.U.
- Cicuttin, A.
- Crespo, M.L.
- Dalla Torre, S.
- Das, S.
- Dasgupta, S.S.
- Denisov, O.Yu.
- Dhara, L.
- Donskov, S.V.
- Doshita, N.
- Duic, V.
- Dunnweber, W.
- Dziewiecki, M.
- Efremov, A.
- Elia, C.
- Eversheim, P.D.
- Eyrich, W.
- Faessler, M.
- Ferrero, A.
- Filin, A.
- Finger, Miroslav
- Finger, Michael, Jr.
- Fischer, H.
- Franco, C.
- du Fresne von Hohenesche, N.
- Friedrich, J.M.
- Garfagnini, R.
- Gautheron, F.
- Gavrichtchouk, O.P.
- Gazda, R.
- Gerassimov, S.
- Geyer, R.
- Giorgi, M.
- Gnesi, I.
- Gobbo, B.
- Goertz, S.
- Grabmuller, S.
- Grasso, A.
- Grube, B.
- Gushterski, R.
- Guskov, A.
- Haas, F.
- von Harrach, D.
- Hasegawa, T.
- Heinsius, F.H.
- Herrmann, F.
- Hess, C.
- Hinterberger, F.
- Horikawa, N.
- Hoppner, Ch.
- d'Hose, N.
- Huber, S.
- Ishimoto, S.
- Ivanov, O.
- Ivanshin, Yu.
- Iwata, T.
- Jahn, R.
- Jasinski, P.
- Jegou, G.
- Joosten, R.
- Kabuss, E.
- Kang, D.
- Ketzer, B.
- Khaustov, G.V.
- Khokhlov, Yu.A.
- Kisselev, Yu.
- Klein, F.
- Klimaszewski, K.
- Koblitz, S.
- Koivuniemi, J.H.
- Kolosov, V.N.
- Kondo, K.
- Konigsmann, K.
- Konorov, I.
- Konstantinov, V.F.
- Korzenev, A.
- Kotzinian, A.M.
- Kouznetsov, O.
- Kramer, M.
- Kroumchtein, Z.V.
- Kunne, F.
- Kurek, K.
- Lauser, L.
- Lednev, A.A.
- Lehmann, A.
- Levorato, S.
- Lichtenstadt, J.
- Maggiora, A.
- Magnon, A.
- Makke, N.
- Mallot, G.K.
- Mann, A.
- Marchand, C.
- Martin, A.
- Marzec, J.
- Massmann, F.
- Matsuda, T.
- Meyer, W.
- Michigami, T.
- Mikhailov, Yu.V.
- Moinester, M.A.
- Morreale, A.
- Mutter, A.
- Nagaytsev, A.
- Nagel, T.
- Nerling, F.
- Neubert, S.
- Neyret, D.
- Nikolaenko, V.I.
- Nowak, W.D.
- Nunes, A.S.
- Olshevsky, A.G.
- Ostrick, M.
- Padee, A.
- Panknin, R.
- Panzieri, D.
- Parsamyan, B.
- Paul, S.
- Perevalova, E.
- Pesaro, G.
- Peshekhonov, D.V.
- Piragino, G.
- Platchkov, S.
- Pochodzalla, J.
- Polak, J.
- Polyakov, V.A.
- Pontecorvo, G.
- Pretz, J.
- Quintans, C.
- Rajotte, J.F.
- Ramos, S.
- Rapatsky, V.
- Reicherz, G.
- Richter, A.
- Rocco, E.
- Rondio, E.
- Rossiyskaya, N.S.
- Ryabchikov, D.I.
- Samoylenko, V.D.
- Sandacz, A.
- Sapozhnikov, M.G.
- Sarkar, S.
- Savin, I.A.
- Sbrizzai, G.
- Schiavon, P.
- Schill, C.
- Schluter, T.
- Schmitt, L.
- Schonning, K.
- Schopferer, S.
- Schroder, W.
- Shevchenko, O.Yu.
- Siebert, H.W.
- Silva, L.
- Sinha, L.
- Sissakian, A.N.
- Slunecka, M.
- Smirnov, G.I.
- Sosio, S.
- Sozzi, F.
- Srnka, A.
- Stolarski, M.
- Sulc, M.
- Sulej, R.
- Sznajder, P.
- Takekawa, S.
- Ter Wolbeek, J.
- Tessaro, S.
- Tessarotto, F.
- Teufel, A.
- Tkatchev, L.G.
- Uhl, S.
- Uman, I.
- Vandenbroucke, M.
- Virius, M.
- Vlassov, N.V.
- Windmolders, R.
- Wislicki, W.
- Wollny, H.
- Zaremba, K.
- Zavertyaev, M.
- Zemlyanichkina, E.
- Ziembicki, M.
- Zhuravlev, N.
- Zvyagin, A.
DOIAbstract
The COMPASS collaboration at CERN has investigated the $\pi^-\gamma \to \pi^-\pi^-\pi^+$ reaction at center-of-momentum energy below five pion masses, $\sqrt{s} \lt 5m_\pi$ , 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, $t' \lt 0.001 GeV^2/c^2$. Using partial-wave analysis techniques, the scattering intensity of Coulomb production described in terms of chiral dynamics and its dependence on the 3pi-invariant mass $m_{3\pi} = \sqrt{s}$ 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 foun...
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