Observation of Exotic Meson Production in the Reactionπ−p→η′π−pat18GeV/c
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Observation of Exotic Meson Production in the Reactionπ−p→η′π−pat18GeV/c

É. I. Ivanov,D. L. Stienike,D. I. Ryabchikov,G. S. Adams,Todd Adams,Z. Bar-Yam,J. M. Bishop,V. A. Bodyagin,D. S. Brown,N. M. Cason,S. U. Chung,J. P. Cummings,K. Danyo,S. P. Denisov,V. A. Dorofeev,J. P. Dowd,P. Eugenio,X. L. Fan,R. W. Hackenburg,M. Hayek,D. Joffe,I. A. Kachaev,W. Kern,E. King,O. L. Kodolova,V. L. Korotkikh,M. A. Kostin,J. Kühn,V. V. Lipaev,J. M. LoSecco,J. J. Manak,J. Napolitano,M. Nozar,C. Olchanski,A. I. Ostrovidov,T. K. Pedlar,A. V. Popov,L. I. Sarycheva,K. K. Seth,X. Shen,N. Shenhav,W. D. Shephard,N. B. Sinev,J. A. Smith,S. A. Taegar,A. Tomaradze,I. N. Vardanyan,D. P. Weygand,D. B. White,H. J. Willutzki,M. Witkowski,A. A. Yershov;É. I. Ivanov;D. L. Stienike;D. I. Ryabchikov;G. S. Adams;Todd Adams;Z. Bar-Yam;J. M. Bishop;V. A. Bodyagin;D. S. Brown;N. M. Cason;S. U. Chung;J. P. Cummings;K. Danyo;S. P. Denisov;V. A. Dorofeev;J. P. Dowd;P. Eugenio;X. L. Fan;R. W. Hackenburg;M. Hayek;D. Joffe;I. A. Kachaev;W. Kern;E. King;O. L. Kodolova;V. L. Korotkikh;M. A. Kostin;J. Kühn;V. V. Lipaev;J. M. LoSecco;J. J. Manak;J. Napolitano;M. Nozar;C. Olchanski;A. I. Ostrovidov;T. K. Pedlar;A. V. Popov;L. I. Sarycheva;K. K. Seth;X. Shen;N. Shenhav;W. D. Shephard;N. B. Sinev;J. A. Smith;S. A. Taegar;A. Tomaradze;I. N. Vardanyan;D. P. Weygand;D. B. White;H. J. Willutzki;M. Witkowski;A. A. Yershov;
physical review letters 2001 Vol. 86 pp. 3977-3980
193
yershov2001physicalobservation

Abstract

An amplitude analysis of an exclusive sample of 5765 events from the reaction π−p→η′π−p at 18GeV/c is described. The η′π− production is dominated by natural parity exchange and by three partial waves: those with JPC=1−+, 2++, and 4++. A mass-dependent analysis of the partial-wave amplitudes indicates the production of the a2(1320) meson as well as the a4(2040) meson, observed for the first time decaying to η′π−. The dominant, exotic (non- qq¯) 1−+ partial wave is shown to be resonant with a mass of 1.597±0.010−0.010+0.045GeV/c2 and a width of 0.340±0.040±0.050GeV/c2. This exotic state, the π1(1600), is produced with a t dependence which is different from that of the a2(1320) meson, indicating differences between the production mechanisms for the two states.

Keywords

production parity amplitudes mesons

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DOI:
10.1103/physrevlett.86.3977
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https://sciprofiles.com/publication/view/f68f71cd7...

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