Evidence for Exotic Meson Production in the Reactionπ−p→ηπ−pat18GeV/c
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ID: 272190
1997
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Abstract
The ηπ− system has been studied in the reaction π−p→ηπ−p at 18GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The a2(1320) is observed in the JPC=2++ wave, as is a broad enhancement between 1.2 and 1.6GeV/c2 in the 1−+ wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to a2(1320) decay. The data can be fitted by interference between the a2(1320) and an exotic 1−+ resonance with M=(1370±16{+50}{−30})MeV/c2 and γ=(385±40−105+65)MeV/c2.
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| Authors | D. R. Thompson,G. S. Adams,Todd Adams,Z. Bar-Yam,J. M. Bishop,V. A. Bodyagin,D. S. Brown,N. M. Cason,S. U. Chung,J. P. Cummings,S. P. Denisov,V. A. Dorofeev,J. P. Dowd,P. Eugenio,R. W. Hackenburg,M. Hayek,É. I. Ivanov,I. A. Kachaev,W. Kern,E. King,O. L. Kodolova,V. L. Korotkikh,M. A. Kostin,J. Kühn,V. V. Lipaev,J. M. LoSecco,J. J. Manak,J. Napolitano,M. Nozar,C. Olchanski,A. I. Ostrovidov,T. K. Pedlar,A. V. Popov,D. I. Ryabchikov,A. H. Sanjari,L. I. Sarycheva,K. K. Seth,W. D. Shephard,N. B. Sinev,J. A. Smith,D. L. Stienike,C. Strassburger,S. A. Taegar,I. N. Vardanyan,D. P. Weygand,D. B. White,H. J. Willutzki,J. Wise,M. Witkowski,A. A. Yershov,D. Zhao;D. R. Thompson;G. S. Adams;Todd Adams;Z. Bar-Yam;J. M. Bishop;V. A. Bodyagin;D. S. Brown;N. M. Cason;S. U. Chung;J. P. Cummings;S. P. Denisov;V. A. Dorofeev;J. P. Dowd;P. Eugenio;R. W. Hackenburg;M. Hayek;É. I. Ivanov;I. A. Kachaev;W. Kern;E. King;O. L. Kodolova;V. L. Korotkikh;M. A. Kostin;J. Kühn;V. V. Lipaev;J. M. LoSecco;J. J. Manak;J. Napolitano;M. Nozar;C. Olchanski;A. I. Ostrovidov;T. K. Pedlar;A. V. Popov;D. I. Ryabchikov;A. H. Sanjari;L. I. Sarycheva;K. K. Seth;W. D. Shephard;N. B. Sinev;J. A. Smith;D. L. Stienike;C. Strassburger;S. A. Taegar;I. N. Vardanyan;D. P. Weygand;D. B. White;H. J. Willutzki;J. Wise;M. Witkowski;A. A. Yershov;D. Zhao; |
| Journal | physical review letters |
| Year | 1997 |
| DOI |
10.1103/physrevlett.79.1630
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| URL | |
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