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DOI 10.1103/physrevlett.108.192001

Медицинская библиотека · Physical review letters · 2012

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, 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, COMPASS Collaboration

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Аннотация

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.

Для цитирования: 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, 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, COMPASS Collaboration. First measurement of chiral dynamics in π- γ → π- π- π+.. Physical review letters. 2012. DOI: 10.1103/physrevlett.108.192001.
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