Evidence for exotic JPC=1-+ meson production in the reaction π-p→ηπ-p at 18 GeV/c

S. U. Chung*, K. Danyo, R. W. Hackenburg, C. Olchanski, D. P. Weygand, H. J. Willutzki, S. P. Denisov, V. A. Dorofeev, I. A. Kachaev, V. V. Lipaev, A. V. Popov, D. I. Ryabchikov, Z. Bar-Yam, J. P. Dowd, P. Eugenio, M. Hayek, W. Kern, E. King, N. Shenhav, V. A. BodyaginO. L. Kodolova, V. L. Korotkikh, M. A. Kostin, A. I. Ostrovidov, L. I. Sarycheva, N. B. Sinev, I. N. Vardanyan, A. A. Yershov, D. S. Brown, T. K. Pedlar, K. K. Seth, J. Wise, D. Zhao, T. Adams, J. M. Bishop, N. M. Cason, E. I. Ivanov, J. M. LoSecco, J. J. Manak, A. H. Sanjari, W. D. Shephard, D. L. Stienike, S. A. Taegar, D. R. Thompson, G. S. Adams, J. P. Cummings, J. Kuhn, M. Nozar, J. A. Smith, D. B. White, M. Witkowski

*Corresponding author for this work

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4 Scopus citations


Details of the analysis of the ηπ- system studied in the reaction π-p→ηπ-p at 18 GeV/c are given. Separate analyses for the 2γ and π+π-π0 decay modes of the η are presented. An amplitude analysis of the data indicates the presence of interference between the a2-(1320) and a JPC=1-+ wave between 1.2 and 1.6 GeV/c2. The phase difference between these waves shows a phase motion not attributable solely to the a2-(1320). The data can be fitted by interference between the a2-(1320) and an exotic 1-+ resonance with M=(1370±16-30+50) MeV/c2 and Γ=(385±40-105+65) MeV/c2. Our results are compared with those of other experiments.

Original languageEnglish (US)
Article number092001
Pages (from-to)1-24
Number of pages24
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
StatePublished - Nov 1 1999

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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