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

Adolph C, Alekseev M G,Alexakhin V Yu,Alexandrov Yu,Alexeev G D,Amoroso A,Antonov A A, Austregesilo A,Badełek 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,Dünnweber W,Dziewiecki M,Efremov A,Elia C,Eversheim P D,Eyrich W,Faessler M,Ferrero A,Filin A,Finger M, 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,Grabmüller 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, 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 V,Khokhlov Yu A,Kisselev Yu,Klein F,Klimaszewski K,Koblitz S,Koivuniemi J H,Kolosov V N,Kondo K,Königsmann K,Konorov I,Konstantinov V F,Korzenev A,Kotzinian A M,Kouznetsov O, Krämer 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,Schlüter T,Schmitt L, Schönning K, Schopferer S, Schröder 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,Wiślicki W, Wollny H,Zaremba K,Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zhuravlev N,Zvyagin A, Null Null

Physical review letters（2012）

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摘要

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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