The COMPASS Collaboration

R. Akhunzyanov,M. G. Alexeev,G. D. Alexeev,A. Amoroso,V. Andrieux,N. V. Anfimov,V. Anosov, A. Antoshkin,K. Augsten,W. Augustyniak,A. Austregesilo,C. D. R. Azevedo,B. Badełek,F. Balestra,M. Ball,J. Barth,R. Beck,Y. Bedfer,J. Bernhard,K. Bicker,E. R. Bielert,R. Birsa,M. Bodlak,P. Bordalo,F. Bradamante,A. Bressan,M. Büchele,V. E. Burtsev,L. Capozza,W.-C. Chang,C. Chatterjee,M. Chiosso,A. G. Chumakov,S.-U. Chung,A. Cicuttin,M. L. Crespo,Q. Curiel,S. Dalla Torre,S. S. Dasgupta,S. Dasgupta,O. Yu. Denisov,L. Dhara,S. V. Donskov,N. Doshita,Ch. Dreisbach,W. Dünnweber,R. R. Dusaev,M. Dziewiecki,A. Efremov,P. D. Eversheim,M. Faessler,A. Ferrero,M. Finger,H. Fischer,C. Franco,N. du Fresne von Hohenesche,J. M. Friedrich,V. Frolov,F. Gautheron,O. P. Gavrichtchouk,S. Gerassimov, J. Giarra,I. Gnesi,M. Gorzellik,A. Grasso, A. Gridin, M. Grosse, Perdekamp,B. Grube,A. Guskov,D. Hahne,G. Hamar,D. von Harrach, R. Heitz,F. Herrmann,N. Horikawa,N. d’Hose,C.-Y. Hsieh,S. Huber,S. Ishimoto,A. Ivanov,T. Iwata,V. Jary,R. Joosten,P. Jörg,E. Kabuß, A. Kerbizi,B. Ketzer,G. V. Khaustov,Yu. A. Khokhlov,Yu. Kisselev,F. Klein,J. H. Koivuniemi,V. N. Kolosov,K. Kondo,I. Konorov,V. F. Konstantinov,A. M. Kotzinian,O. M. Kouznetsov, Z. Kral,M. Krämer,F. Krinner,Z. V. Kroumchtein, Y. Kulinich,F. Kunne,K. Kurek,R. P. Kurjata,I. I. Kuznetsov,A. Kveton,A. A. Lednev,E. A. Levchenko,S. Levorato, Y.-S. Lian,J. Lichtenstadt,R. Longo,V. E. Lyubovitskij,A. Maggiora,A. Magnon,N. Makins,N. Makke,G. K. Mallot,S. A. Mamon,C. Marchand,B. Marianski,A. Martin,J. Marzec,J. Matoušek,H. Matsuda,T. Matsuda,G. V. Meshcheryakov,M. Meyer,W. Meyer, Yu. V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov,Y. Miyachi,A. Moretti,A. Nagaytsev,F. Nerling,D. Neyret,J. Nový,W.-D. Nowak,G. Nukazuka,A. S. Nunes,A. G. Olshevsky,I. Orlov,M. Ostrick,D. Panzieri,B. Parsamyan,S. Paul,J.-C. Peng,F. Pereira,G. Pesaro,M. Pešek, M. Pešková,D. V. Peshekhonov, N. Pierre,S. Platchkov,J. Pochodzalla,V. A. Polyakov,J. Pretz, M. Quaresma,C. Quintans,S. Ramos,C. Regali,G. Reicherz,C. Riedl,D. I. Ryabchikov, A. Rybnikov,A. Rychter, R. Salac,V. D. Samoylenko,A. Sandacz,S. Sarkar,I. A. Savin,T. Sawada,G. Sbrizzai,P. Schiavon,H. Schmieden, E. Seder,A. Selyunin,L. Silva,L. Sinha,S. Sirtl,M. Slunecka,F. Sozzi,J. Smolik,A. Srnka, D. Steffen,M. Stolarski, O. Subrt,M. Sulc,H. Suzuki,A. Szabelski,T. Szameitat,P. Sznajder,M. Tasevsky,S. Tessaro,F. Tessarotto,A. Thiel, J. Tomsa,F. Tosello,V. Tskhay,S. Uhl,B. I. Vasilishin, A. Vauth,B. M. Veit, J. Veloso, A. Vidon,M. Virius, S. Wallner,M. Wilfert,R. Windmolders,K. Zaremba,P. Zavada,M. Zavertyaev,E. Zemlyanichkina,M. Ziembicki

semanticscholar（2002）

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摘要

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π−π−π+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420 000 events taken at values of the squared 4-momentum transfer t′ between 0.1 and 1 GeV/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural parity exchange production of a resonance with spin-exotic quantum numbers JPC = 1−+ at 1.66 GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the JPC = 2−+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660 ± 10 −64) MeV/c2 and a width of (269 ± 21 −64) MeV/c2 are deduced, with an intensity of (1.7 ± 0.2)% of the total intensity. PACS 13.25.-k, 13.85.-t, 14.40.Be, 29.30.-h

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