Observation of exotic meson production in the reaction {pi}{sup -} p {yields} {eta}{prime} {pi}{sup -} p at 18 GeV/c

An amplitude analysis of an exclusive sample of 5765 events from the reaction {pi}{sup -} p {yields} {eta}{prime}{pi}{sup -} p at 18 GeV/c is described. The {eta}{prime}{pi}{sup -} production is dominated by natural parity exchange and by three partial waves: those with J{sup PC} = 1{sup -+}, 2{sup...

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Veröffentlicht in:Physical review letters 2001-04, Vol.86
Hauptverfasser: Z. Bar-Yam, Amiran Tomaradze, A.A. Yershov, Alexander Ostrovidov, A.V. Popov, C. Olchanski, David Joffe, D.B. White, D.I. Ryabchikov, Doran Stienike, D.S. Brown, Dennis Weygand, E. King, Gary Adams, Hans Willutzki, I.A. Kachaev, I.N. Vardanian, J.A. Smith, James Bishop, John LoSecco, John P. Dowd, James Napolitano, Joachim Kuhn, Joseph Manak, John Cummings, K. Danyo, Kamal Seth, Ludmilla Sarycheva, M. Hayek, M.A. Kostin, Michael Witkowski, Mina Nozar, N. Shenhav, N.B. Sinev, Neal Cason, O.L. Kodolova, Paul Eugenio, R.W. Hackenburg, Sydney Taegar, Sergey Denisov, Suh-Urk Chung, Todd Adams, Todd Pedlar, V.A. Bodyagin, V.A. Dorofeev, V.L. Korotkikh, V.V. Lipaev, W. Kern, William Shephard, Xiao Shen, X.L. Fan
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container_title Physical review letters
container_volume 86
creator Z. Bar-Yam
Amiran Tomaradze
A.A. Yershov
Alexander Ostrovidov
A.V. Popov
C. Olchanski
David Joffe
D.B. White
D.I. Ryabchikov
Doran Stienike
D.S. Brown
Dennis Weygand
E. King
Gary Adams
Hans Willutzki
I.A. Kachaev
I.N. Vardanian
J.A. Smith
James Bishop
John LoSecco
John P. Dowd
James Napolitano
Joachim Kuhn
Joseph Manak
John Cummings
K. Danyo
Kamal Seth
Ludmilla Sarycheva
M. Hayek
M.A. Kostin
Michael Witkowski
Mina Nozar
N. Shenhav
N.B. Sinev
Neal Cason
O.L. Kodolova
Paul Eugenio
R.W. Hackenburg
Sydney Taegar
Sergey Denisov
Suh-Urk Chung
Todd Adams
Todd Pedlar
V.A. Bodyagin
V.A. Dorofeev
V.L. Korotkikh
V.V. Lipaev
W. Kern
William Shephard
Xiao Shen
X.L. Fan
description An amplitude analysis of an exclusive sample of 5765 events from the reaction {pi}{sup -} p {yields} {eta}{prime}{pi}{sup -} p at 18 GeV/c is described. The {eta}{prime}{pi}{sup -} production is dominated by natural parity exchange and by three partial waves: those with J{sup PC} = 1{sup -+}, 2{sup ++}, and 4{sup ++}. A mass-dependent analysis of the partial-wave amplitudes indicates the production of the a{sub 2}(1320) meson as well as the a{sub 4}(2040) meson, observed for the first time decaying to {eta}{prime}{pi}{sup -}. The dominant, exotic (non-q{bar q}) 1{sup -+} partial wave is shown to be resonant with a mass of 1.597 {+-} 0.010{sub -0.010}{sup +0.045} GeV/c{sup 2} and a width of 0.340 {+-} 0.040 {+-} 0.050 GeV/c{sup 2}. This exotic state, the {pi}{sub 1}(1600), is produced with a t dependence which is different from that of the a{sub 2}(1320) meson, indicating differences between the production mechanisms for the two states.
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Fan</creatorcontrib><creatorcontrib>Thomas Jefferson National Accelerator Facility, Newport News, VA (US)</creatorcontrib><title>Observation of exotic meson production in the reaction {pi}{sup -} p {yields} {eta}{prime} {pi}{sup -} p at 18 GeV/c</title><title>Physical review letters</title><description>An amplitude analysis of an exclusive sample of 5765 events from the reaction {pi}{sup -} p {yields} {eta}{prime}{pi}{sup -} p at 18 GeV/c is described. The {eta}{prime}{pi}{sup -} production is dominated by natural parity exchange and by three partial waves: those with J{sup PC} = 1{sup -+}, 2{sup ++}, and 4{sup ++}. A mass-dependent analysis of the partial-wave amplitudes indicates the production of the a{sub 2}(1320) meson as well as the a{sub 4}(2040) meson, observed for the first time decaying to {eta}{prime}{pi}{sup -}. The dominant, exotic (non-q{bar q}) 1{sup -+} partial wave is shown to be resonant with a mass of 1.597 {+-} 0.010{sub -0.010}{sup +0.045} GeV/c{sup 2} and a width of 0.340 {+-} 0.040 {+-} 0.050 GeV/c{sup 2}. 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The dominant, exotic (non-q{bar q}) 1{sup -+} partial wave is shown to be resonant with a mass of 1.597 {+-} 0.010{sub -0.010}{sup +0.045} GeV/c{sup 2} and a width of 0.340 {+-} 0.040 {+-} 0.050 GeV/c{sup 2}. This exotic state, the {pi}{sub 1}(1600), is produced with a t dependence which is different from that of the a{sub 2}(1320) meson, indicating differences between the production mechanisms for the two states.</abstract><cop>United States</cop><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0031-9007
ispartof Physical review letters, 2001-04, Vol.86
issn 0031-9007
1079-7114
language eng
recordid cdi_osti_scitechconnect_839037
source American Physical Society Journals
subjects AMPLITUDES
MESONS
PARITY
PARTIAL WAVES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PRODUCTION
title Observation of exotic meson production in the reaction {pi}{sup -} p {yields} {eta}{prime} {pi}{sup -} p at 18 GeV/c
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