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. 2012 May 11;108(19):192001.
doi: 10.1103/PhysRevLett.108.192001. Epub 2012 May 11.

First measurement of chiral dynamics in π- γ → π- π- π+

C Adolph  1 , M G Alekseev, V Yu Alexakhin, Yu Alexandrov, G D Alexeev, A Amoroso, A A Antonov, A Austregesilo, B Badełek, F Balestra, J Barth, G Baum, Y Bedfer, J Bernhard, R Bertini, M Bettinelli, K A Bicker, R Birsa, J Bisplinghoff, P Bordalo, F Bradamante, C Braun, A Bravar, A Bressan, E Burtin, D Chaberny, M Chiosso, S U Chung, A Cicuttin, M L Crespo, S Dalla Torre, S Das, S S Dasgupta, O Yu Denisov, L Dhara, S V Donskov, N Doshita, V Duic, W Dünnweber, M Dziewiecki, A Efremov, C Elia, P D Eversheim, W Eyrich, M Faessler, A Ferrero, A Filin, M Finger, M Finger Jr, H Fischer, C Franco, N du Fresne von Hohenesche, J M Friedrich, R Garfagnini, F Gautheron, O P Gavrichtchouk, R Gazda, S Gerassimov, R Geyer, M Giorgi, I Gnesi, B Gobbo, S Goertz, S Grabmüller, A Grasso, B Grube, R Gushterski, A Guskov, F Haas, D von Harrach, T Hasegawa, F H Heinsius, F Herrmann, C Hess, F Hinterberger, N Horikawa, Ch Höppner, N d'Hose, S Huber, S Ishimoto, O Ivanov, Yu Ivanshin, T Iwata, R Jahn, P Jasinski, G Jegou, R Joosten, E Kabuss, D Kang, B Ketzer, G V Khaustov, Yu A Khokhlov, Yu Kisselev, F Klein, K Klimaszewski, S Koblitz, J H Koivuniemi, V N Kolosov, K Kondo, K Königsmann, I Konorov, V F Konstantinov, A Korzenev, A M Kotzinian, O Kouznetsov, M Krämer, Z V Kroumchtein, F Kunne, K Kurek, L Lauser, A A Lednev, A Lehmann, S Levorato, J Lichtenstadt, A Maggiora, A Magnon, N Makke, G K Mallot, A Mann, C Marchand, A Martin, J Marzec, F Massmann, T Matsuda, W Meyer, T Michigami, Yu V Mikhailov, M A Moinester, A Morreale, A Mutter, A Nagaytsev, T Nagel, F Nerling, S Neubert, D Neyret, V I Nikolaenko, W-D Nowak, A S Nunes, A G Olshevsky, M Ostrick, A Padee, R Panknin, D Panzieri, B Parsamyan, S Paul, E Perevalova, G Pesaro, D V Peshekhonov, G Piragino, S Platchkov, J Pochodzalla, J Polak, V A Polyakov, G Pontecorvo, J Pretz, C Quintans, J-F Rajotte, S Ramos, V Rapatsky, G Reicherz, A Richter, E Rocco, E Rondio, N S Rossiyskaya, D I Ryabchikov, V D Samoylenko, A Sandacz, M G Sapozhnikov, S Sarkar, I A Savin, G Sbrizzai, P Schiavon, C Schill, T Schlüter, L Schmitt, K Schönning, S Schopferer, W Schröder, O Yu Shevchenko, H-W Siebert, L Silva, L Sinha, A N Sissakian, M Slunecka, G I Smirnov, S Sosio, F Sozzi, A Srnka, M Stolarski, M Sulc, R Sulej, P Sznajder, S Takekawa, J Ter Wolbeek, S Tessaro, F Tessarotto, A Teufel, L G Tkatchev, S Uhl, I Uman, M Vandenbroucke, M Virius, N V Vlassov, R Windmolders, W Wiślicki, H Wollny, K Zaremba, M Zavertyaev, E Zemlyanichkina, M Ziembicki, N Zhuravlev, A Zvyagin; COMPASS Collaboration
Affiliations
Free article

First measurement of chiral dynamics in π- γ → π- π- π+

C Adolph et al. Phys Rev Lett. .
Free article

Abstract

The COMPASS Collaboration at CERN has investigated the π- γ → π- π- π+ reaction at center-of-momentum energy below five pion masses, sqrt[s]<5m(π), 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/c2. 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.

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