Observation of a new J(PC)=1(-+) exotic state in the reaction pi(-)p ->pi(+)pi(-)pi(-)p at 18 GeV/c

Authors
Adams, GS Adams, T Bar-Yam, Z Bishop, JM Bodyagin, VA Brabson, BB Brown, DS Cason, NM Chung, SU Crittenden, RR Cummings, JP Danyo, K Denisov, S Dorofeev, V Dowd, JP Dzierba, AR Eugenio, P Gunter, J Hackenburg, RW Hayek, M Ivanov, EI Kachaev, I Kern, W King, E Kodolova, OL Korotkikh, VL Kostin, MA Kuhn, J Lindenbusch, R Lipaev, V LoSecco, JM Manak, JJ Napolitano, J Nozar, M Olchanski, C Ostrovidov, AI Pedlar, TK Popov, A Rust, DR Ryabchikov, D Sanjari, AH Sarycheva, LI Scott, E Seth, KK Shenhav, N Shephard, WD Sinev, NB Smith, JA Smith, PT Stienike, DL Sulanke, T Taegar, SA Teige, S Thompson, DR Vardanyan, IN Weygand, DP White, D Willutzki, HJ Wise, J Witkowski, M Yershov, AA Zhao, D
Citation
Gs. Adams et al., Observation of a new J(PC)=1(-+) exotic state in the reaction pi(-)p ->pi(+)pi(-)pi(-)p at 18 GeV/c, PHYS REV L, 81(26), 1998, pp. 5760-5763
Citations number
28
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
81
Issue
26
Year of publication
1998
Pages
5760 - 5763
Database
ISI
SICI code
0031-9007(199812)81:26<5760:OOANJE>2.0.ZU;2-4
Abstract
A partial-wave analysis of the reaction pi(-)p --> pi(+)pi(-)pi(-)p at 18 G eV/c has been performed on a data sample of 250 000 events obtained by Broo khaven experiment E852. The expected J(PC) = l(++)a(1)(1260), 2(++)a(2)(132 0), and 2(-+)pi(2)(1670) resonant states are clearly observed. The exotic J (PC) = 1(-+) wave produced in the natural parity exchange processes shows d istinct resonancelike phase motion at about 1.6 GeV/c(2) in the rho pi chan nel. A mass-dependent fit results in a resonance mass of 1593 +/- 8(-47)(+2 9) MeV/c(2) and a width of 168 +/- 20(-12)(+150) MeV/c(2).