1. Observation of a NewJPC=1−+Exotic State in the Reactionπ−p→π+π−π−pat18GeV/c
- Author
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P. Eugenio, P. T. Smith, V. A. Bodyagin, E. Scott, A. H. Sanjari, J. M. Bishop, Sergey Denisov, N. Shenhav, I. Kachaev, V. Dorofeev, M. A. Kostin, J. Wise, S. A. Taegar, I. N. Vardanyan, N. M. Cason, A. Popov, T. K. Pedlar, A. R. Dzierba, J. P. Cummings, E. I. Ivanov, Todd Adams, Vladimir Korotkikh, H. J. Willutzki, M. Witkowski, V. Lipaev, D. Zhao, M. Nozar, Z. Bar-Yam, W. D. Shephard, D. R. Thompson, J. Napolitano, D. P. Weygand, W. Kern, A. A. Yershov, L. I. Sarycheva, J. A. Smith, S. Teige, J. M. LoSecco, D. White, G. S. Adams, D. S. Brown, T. Sulanke, R. Lindenbusch, Jens H. Kuhn, S. U. Chung, N. B. Sinev, A. I. Ostrovidov, Olga Kodolova, C. Olchanski, R.R. Crittenden, D. R. Rust, K. Danyo, B. B. Brabson, R. W. Hackenburg, J. P. Dowd, J. Gunter, J. J. Manak, D. L. Stienike, M. Hayek, D. I. Ryabchikov, E. King, and K. K. Seth
- Subjects
Physics ,Particle physics ,Crystallography ,Partial wave analysis ,Pi ,General Physics and Astronomy - Abstract
A partial-wave analysis of the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}p$ at $18\mathrm{GeV}/c$ has been performed on a data sample of 250 000 events obtained by Brookhaven experiment E852. The expected ${J}^{\mathrm{PC}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1}^{++}{a}_{1}(1260)$, ${2}^{++}{a}_{2}(1320)$, and ${2}^{\ensuremath{-}+}{\ensuremath{\pi}}_{2}(1670)$ resonant states are clearly observed. The exotic ${J}^{\mathrm{PC}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1}^{\ensuremath{-}+}$ wave produced in the natural parity exchange processes shows distinct resonancelike phase motion at about $1.6\mathrm{GeV}{/c}^{2}$ in the $\ensuremath{\rho}\ensuremath{\pi}$ channel. A mass-dependent fit results in a resonance mass of $1593\ifmmode\pm\else\textpm\fi{}{8}_{\ensuremath{-}47}^{+29}\mathrm{MeV}{/c}^{2}$ and a width of $168\ifmmode\pm\else\textpm\fi{}{20}_{\ensuremath{-}12}^{+150}\mathrm{MeV}{/c}^{2}$.
- Published
- 1998
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