Evidence for exotic meson production in the reaction π p → η π p at 18 GeV/c

D. R. Thompson, G. S. Adams, T. Adams, Z. Bar-Yam4, 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, E. I. Ivanov, I. A. Kachaev, W. Kern, E. KingO. L. Kodolova, V. L. Korotkikh, M. A. Kostin, J. Kuhn, V. V. Lipaev, J. M. Lo Secco1, 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

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249 Scopus citations


The ηπ system has been studied in the reaction π p → η π p at 18 GeV/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+65-105) MeV/c2. 1997

Original languageEnglish (US)
Pages (from-to)1630-1633
Number of pages4
JournalPhysical review letters
Issue number23
StatePublished - 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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