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, Kamal 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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Abstract

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 a 2 (1320) is observed in the J PC = 2 ++ wave, as is a broad enhancement between 1.2 and 1.6GeV/c 2 in the 1 -+ wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to a 2 (1320) decay. The data can be fitted by interference between the a 2 (1320) and an exotic 1 -+ resonance with M = (1370 ± 16 (+50)(-30))MeV/C 2 and γ = (385 ± 40 +65 -105 ) MeV/c 2 . 1997

Original languageEnglish (US)
Pages (from-to)1630-1633
Number of pages4
JournalPhysical Review Letters
Volume79
Issue number23
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Thompson, D. R., Adams, G. S., Adams, T., Bar-Yam4, Z., Bishop, J. M., Bodyagin, V. A., Brown, D. S., Cason, N. M., Chung, S. U., Cummings, J. P., Denisov, S. P., Dorofeev, V. A., Dowd, J. P., Eugenio, P., Hackenburg, R. W., Hayek, M., Ivanov, E. I., Kachaev, I. A., Kern, W., ... Zhao, D. (1997). Evidence for exotic meson production in the reaction π p → η π p at 18 GeV/c Physical Review Letters, 79(23), 1630-1633. https://doi.org/10.1103/PhysRevLett.79.1630