First Measurement of Chiral Dynamics in pi(-)gamma -> pi(-)pi(-)pi(+)

0390521 - ÚPT 2013 RIV US eng J - Článek v odborném periodiku
Adolph, C. - Alekseev, M. - Alexakhin, V. Yu. - Alexandrov, Yu. - Alexeev, G. D. - Amoroso, A. - Antonov, A. A. - Austregisilio, A. - Badelek, B. - Balestra, F. - Barth, J. - Baum, G. - Bedfer, Y. - Bernhard, J. - Bertini, R. - Bettinelli, M. - Bicker, K. - 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. - Dalla Torre, S. - Das, S. - Dasgupta, S. S. - Denisov, O. - Dhara, L. - Donskov, S. - Doshita, N. - Duic, V. - Dünnweber, W. - Dziewiecki, M. - Efremov, A.V. - Elia, C. - Eversheim, P. - Eyrich, W. - Faessler, M. - Ferrero, A. - Filin, A. - Finger, M. - Finger jr., M. - Fischer, H. - Franco, C. - Fresne von Hohenesche, N. - Friedrich, J. - Garfagnini, R. - Gautheron, F. - Gavrichtchouk, O. - Gazda, R. - Gerassimov, S. - Geyer, R. - Giorgi, M. - Gnesi, I. - Gobbo, B. - Goertz, S. - Grabmüller, S. - Grasso, A. - Grube, B. - Gushterski, R. - Guskov, A. - Haas, F. - von Harrach, D. - Hasegawa, T. - Heinsius, F. - Herrmann, F. - Hess, C. - Hinterberger, F. - Horikawa, N. - Höppner, 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. - Khokhlov, Y. - Kisselev, Y. - Klein, F. - Klimaszewski, K. - Koblitz, S. - Koivuniemi, J. - Kolosov, V. - Kondo, K. - Königsmann, K. - Konorov, I. - Konstantinov, V. - Korzenev, A. - Kotzinian, A. - Kouznetsov, O. - Krämer, M. - Kroumchtein, Z. - Kunne, F. - Kurek, K. - Lauser, L. - Lednev, A. - Lehmann, A. - Levorato, S. - Lichtenstadt, J. - Maggiora, A. - Magnon, A. - Makke, N. - Mallot, G. - Mann, A. - Marchand, C. - Martin, A. - Marzec, J. - Massmann, F. - Matsuda, T. - Meyer, W. - Michigami, T. - Mikhailov, Y. - Moinester, M. - Morreale, A. - Mutter, A. - Nagaytsev, A. - Nagel, T. - Nerling, F. - Neubert, S. - Neyret, D. - Nikolaenko, V. - Nowak, W. D. - Nunes, A.S. - Olshevsky, A. - Ostrick, M. - Padee, A. - Panknin, R. - Panzieri, D. - Parsamyan, B. - Paul, S. - Perevalova, E. - Pesaro, G. - Peshekhonov, D. - Piragino, G. - Platchkov, S. - Pochodzalla, J. - Polak, J. - Polyakov, V. - Pontecorvo, G. - Pretz, J. - Quintans, C. - Rajotte, J. - Ramos, S. - Rapatsky, V. - Reicherz, G. - Richter, A. - Rocco, E. - Rondio, E. - Rossiyskaya, N. S. - Ryabchikov, D. - Samoylenko, V. - Sandacz, A. - Sapozhnikov, M. - Sarkar, S. - Savin, I. - Sbrizzai, G. - Schiavon, P. - Schill, C. - Schlütter, T. - Schmitt, L. - Schönning, K. - Schopferer, S. - Schröder, W. - Shevchenko, O. - Siebert, H. - Silva, L. - Sinha, L. - Sissakian, A. - Slunecka, M. - Smirnov, G. - Sosio, S. - Sozzi, F. - Srnka, Aleš - Stolarski, M. - Sulc, M. - Sulej, R. - Sznajder, P. - Takekawa, S. - Ter Wolbeek, J. - Tessaro, S. - Tessarotto, F. - Teufel, A. - Tkatchev, L. - Uhl, S. - Uman, I. - Vandenbroucke, M. - Virius, M. - Vlassov, N. - Windmolders, R. - Wislicki, W. - Wollny, H. - Zaremba, K. - Zavertyaev, M. - Zemlyanichkina, E. - Ziembicki, M. - Zhuravlev, N. - Zvyagin, A.
First Measurement of Chiral Dynamics in pi(-)gamma -> pi(-)pi(-)pi(+).
Physical Review Letters. Roč. 108, č. 19 (2012), 192001:1-6. ISSN 0031-9007. E-ISSN 1079-7114
Institucionální podpora: RVO:68081731
Klíčová slova: low energies
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 7.943, rok: 2012

The COMPASS Collaboration at CERN has investigated the pi(-)gamma -> pi(-)pi(-)pi(+) reaction at center-of-momentum energy below five pion masses, root s < 5m(pi), embedded in the Primakoff reaction of 190 GeV pions impinging on a lead target. Exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, t' < 0.001 GeV2/c(2). Using partial-wave analysis techniques, the scattering intensity of Coulomb production described in terms of chiral dynamics and its dependence on the 3 pi-invariant mass m(3 pi) = root s were extracted. The absolute cross section was determined in seven bins of root 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.
Trvalý link: http://hdl.handle.net/11104/0219407