First Measurement of Chiral Dynamics in \pi^- \gamma -> \pi^- \pi^- \pi^+
FCT| COLLABORATION IN THE COMPASS EXPERIMENT AT CERN ,
FCT| COLLABORATION IN THE COMPASS EXPERIMENT AT CERN ,
FCT| COLLABORATION IN THE COMPASS EXPERIMENT AT CERN
Adolph C.; Alekseev M. G.; Alexakhin V. Y.u.; Alexandrov Y.u.; Alexeev G. D.; Amoroso A.; Antonov A. A.; +193 Authors
Adolph C.; Alekseev M. G.; Alexakhin V. Y.u.; Alexandrov Y.u.; 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. Y.u.; Dhara L.; Donskov S. V.; Doshita N.; Duic V.; Duennweber W.; Dziewiecki M.; Efremov A.; Elia C.; Eversheim P. D.; Eyrich W.; Faessler M.; Ferrero A.; Filin A.; Finger M.; Finger M. J.r.; Fischer H.; Franco C.; von Hohenesche N. du Fresne; Friedrich J. M.; Garfagnini R.; Gautheron F.; Gavrichtchouk O. P.; Gazda R.; Gerassimov S.; Geyer R.; Giorgi M.; Gnesi I.; Gobbo B.; Goertz S.; Grabmueller 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.; Hoeppner C.h.; d'Hose N.; Huber S.; Ishimoto S.; Ivanov O.; Ivanshin Y.u.; Iwata T.; Jahn R.; Jasinski P.; Jegou G.; Joosten R.; Kabuss E.; Kang D.; Ketzer B.; Khaustov G. V.; Khokhlov Y.u. A.; Kisselev Y.u.; Klein F.; Klimaszewski K.; Koblitz S.; Koivuniemi J. H.; Kolosov V. N.; Kondo K.; Koenigsmann K.; Konorov I.; Konstantinov V. F.; Korzenev A.; Kotzinian A. M.; Kouznetsov O.; Kraemer 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 Y.u. 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.; 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.; Schlueter T.; Schmitt L.; Schoenning K.; Schopferer S.; Schroeder W.; Shevchenko O. Y.u.; 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.;
First Measurement of Chiral Dynamics in \pi^- \gamma -> \pi^- \pi^- \pi^+
The COMPASS collaboration at CERN has investigated the \pi^- \gamma -> \pi^- \pi^- \pi^+ reaction at center-of-momentum energy below five pion masses, sqrt(s) < 5 m(\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' < 0.001 (GeV/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) = 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.
Comment: 10 pages, 5 figures
Germany, Italy
High Energy Physics - Experiment
High Energy Physics - Experiment
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