Observation of a new JPC = 1-+ exotic state in the reaction π-π → π+π-π-p at 18 GeV/c

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

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219 Scopus citations


A partial-wave analysis of the reaction π-π → π+π-π-p at 18 GeV/c has been performed on a data sample of 250 000 events obtained by Brookhaven experiment E852. The expected JPC = 1++a1(1260), 2++a2(1320), and 2-+π2(1670) resonant states are clearly observed. The exotic JPC = 1-+ wave produced in the natural parity exchange processes shows distinct resonancelike phase motion at about 1.6GeV/c2 in the ρπ channel. A mass-dependent fit results in a resonance mass of 1593 ± 8+29 -47 MeV /c2 and a width of 168 ± 20+150 -12 MeV /c2.

Original languageEnglish (US)
Pages (from-to)5760-5763
Number of pages4
JournalPhysical review letters
Issue number26
StatePublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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