First Measurement Of Chiral Dynamics In Pi(-)Gamma -> Pi(-)Pi(-)Pi(+)

C Adolph,M G Alekseev,V Yu Alexakhin, Y A Alexandrov,G D Alexeev,A Amoroso,A Antonov,A Austregesilo,B Badelek,F Balestra,John A Barth,Gunter Baum,Y Bedfer,J C Bernhard,R Bertini, M Bettinelli, K Bicker,R Birsa,J Bisplinghoff,P Bordalo,F Bradamante,Claude M J Braun,A Bravar,Alessandro Bressan,E Burtin,D Chaberny,M Chiosso,S U Chung,A Cicuttin,M L Crespo,S Dalla Torre,Samar K Das,S S Dasgupta,O Yu Denisov,L Dhara,S V Donskov,N Doshita,V Duic,W Duennweber,M Dziewiecki,A Efremov,C Elia,P D Eversheim,W Eyrich,M A Faessler,A Ferrero,A P Filin,M Finger,H G Fischer,C Franco,N Du Fresne Von Hohenesche,J M Friedrich,R Garfagnini,F Gautheron,O P Gavrichtchouk,R Gazda,S G Gerassimov,R Geyer,M A Giorgi,I Gnesi,B Gobbo,S Goertz,S Grabmueller,A Grasso,B Grube,R Gushterski,A Guskov,F A Haas,D Von Harrach,T Hasegawa,F H Heinsius,F H Herrmann,C Hess,F Hinterberger,N Horikawa,Ch Hoeppner, N Dhose,S Huber,S Ishimoto,O Ivanov,Yu I Ivanshin,T Iwata,R G Jahn,P Jasinski,G Jegou,R Joosten,E M Kabuss,D Kang,B Ketzer,G V Khaustov,Yu A Khokhlov,Yu Kisselev, F J Klein,K Klimaszewski,S Koblitz,J H Koivuniemi,V N Kolosov,K Kondo, K Koenigsmann,I Konorov,V F Konstantinov,A Korzenev,A M Kotzinian,O Kouznetsov,M Kraemer,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,Tatsuma D Matsuda, W T Meyer,T Michigami,Yu V Mikhailov,M A Moinester, A Morreale,A Mutter,A Nagaytsev,T Nagel,F Nerling,S Neubert,D Neyret, V 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 M Polak,V A Polyakov,G B Pontecorvo,J Pretz,C Quintans,J F Rajotte,Silvio Junio 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 Savin,G Sbrizzai,P Schiavon,C Schill,T Schlueter,L Schmitt,K Schoenning,S Schopferer,W A Schroeder,O Yu Shevchenko, H W Siebert, Luciana Villa Nova 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 Wislicki,H Wollny,K Zaremba,M Zavertyaev,E Zemlyanichkina,M Ziembicki,N Zhuravlev, Alexander Zvyagin

PHYSICAL REVIEW LETTERS（2012）

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摘要

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.

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