Exotic and qq̄ resonances in the π+π-π- system produced in π-p collisions at 18 GeV/c

S. U. Chung*, K. Danyo, R. W. Hackenburg, C. Olchanski, J. S. Suh, H. J. Willutzki, S. P. Denisov, V. Dorofeev, 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. Bodyagin, O. L. KodolovaV. L. Korotkikh, M. A. Kostin, A. I. Ostrovidov, L. I. Sarycheva, I. N. Vardanyan, A. A. Yershov, D. S. Brown, X. L. Fan, D. Joffe, T. K. Pedlar, K. K. Seth, A. Tomaradze, T. Adams, J. M. Bishop, N. M. Cason, E. I. Ivanov, J. M. LoSecco, J. J. Manak, W. D. Shephard, D. L. Stienike, S. A. Taegar, G. S. Adams, J. P. Cummings, J. Hu, J. Kuhn, M. Lu, J. Napolitano, D. B. White, M. Witkowski, M. Nozar, X. Shen, D. P. Weygand

*Corresponding author for this work

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90 Scopus citations


A partial-wave analysis of the reaction π-p→π+π-π-p at 18 GeV/c has been performed on a data sample of 250 000 events obtained in the Brookhaven experiment E852. The well-known a1 (1260), a2(1320) and π2(1670) resonant states are observed. The existence of the π(1800), a1(1700) and a4(2040) states is confirmed. The a3(1874) state is also observed. The exotic 1-+π1(1600) state produced in the natural parity exchange process is found to decay in the p(770)π- channel. A mass-dependent fit results in a resonance mass of 1593±8-47+29 MeV/c2 and a Width of 168±20-12+150 MeV/c2.

Original languageEnglish (US)
Article number072001
Pages (from-to)720011-7200116
Number of pages6480106
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7 A
StatePublished - Apr 1 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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