Exotic meson production in the f1(1285)π- system observed in the reaction π-p → ηπ+π -π-p at 18 GeV/c

J. Kuhn*, G. S. Adams, T. Adams, Z. Bar-Yam, J. M. Bishop, V. A. Bodyagin, D. S. Brown, N. M. Cason, S. U. Chung, J. P. Cummings, K. Danyo, A. I. Demianov, S. P. Denisov, V. Dorofeev, J. P. Dowd, P. Eugenio, X. L. Fan, A. M. Gribushin, R. W. Hackenburg, M. HayekJ. Hu, E. I. Ivanov, D. Joffe, I. Kachaev, W. Kern, E. King, O. L. Kodolova, V. L. Korotkikh, M. A. Kostin, V. V. Lipaev, J. M. LoSecco, M. Lu, J. J. Manak, J. Napolitano, M. Nozar, C. Olchanski, A. I. Ostrovidov, T. K. Pedlar, A. V. Popov, D. I. Ryabchikov, L. I. Sarycheva, K. K. Seth, N. Shenhav, X. Shen, W. D. Shephard, N. B. Sinev, D. L. Stienike, J. S. Suh, S. A. Taegar, A. Tomaradze, I. N. Vardanyan, D. P. Weygand, D. B. White, H. J. Willutzki, M. Witkowski, A. A. Yershov

*Corresponding author for this work

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98 Scopus citations


This Letter reports results from the partial wave analysis of the π-π-π+η final state in π-p collisions at 18GeV/c. Strong evidence is observed for production of two mesons with exotic quantum numbers of spin, parity and charge conjugation, JPC=1-+ in the decay channel f 1(1285)π-. The mass M=1709±24±41MeV/ c2 and width Γ=403±80±115MeV/c2 of the first state are consistent with the parameters of the previously observed π1(1600). The second resonance with mass M= 2001±30±92MeV/c2 and width Γ= 333±52±49MeV/c2 agrees very well with predictions from theoretical models. In addition, the presence of π2(1900) is confirmed with mass M=2003±88±148MeV/c2 and width Γ=306±132±121MeV/c2 and a new state, a 1(2096), is observed with mass M=2096±17±121MeV/c 2 and width Γ=451±41±81MeV/c2. The decay properties of these last two states are consistent with flux tube model predictions for hybrid mesons with non-exotic quantum numbers.

Original languageEnglish (US)
Pages (from-to)109-117
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
StatePublished - Aug 12 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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