Exotic andqq¯resonances in theπ+π−π−system produced inπ−pcollisions at18 GeV/c

Exotic andqq¯resonances in theπ+π−π−system produced inπ−pcollisions at18 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. Kodolova,V. 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;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. Kodolova;V. 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;
physical review d 2002 Vol. 65 pp. 072001-
177
weygand2002physicalexotic

Abstract

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 ρ(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.

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