The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$

The results are presented of partial wave analyses of almost 600000 events from the reaction pi /sup -/p to pi /sup -/ pi /sup -/ pi /sup +/p at 63 and 94 GeV/c and with a higher momentum transfer trigger. The shape of the 1/sup +/S ( rho pi ) mass spectrum changes substantially as a function of t,...

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Detalles Bibliográficos
Autor principal: Thompson, G
Lenguaje:eng
Publicado: 1979
Materias:
Particle Physics - Experiment
Particle Physics - Phenomenology
Acceso en línea:http://cds.cern.ch/record/875217
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author Thompson, G
author_facet Thompson, G
author_sort Thompson, G
collection CERN
description The results are presented of partial wave analyses of almost 600000 events from the reaction pi /sup -/p to pi /sup -/ pi /sup -/ pi /sup +/p at 63 and 94 GeV/c and with a higher momentum transfer trigger. The shape of the 1/sup +/S ( rho pi ) mass spectrum changes substantially as a function of t, and is not compatible with predictions of the Deck model. In addition, the phase of this partial wave rises by approximately 90 degrees over a mass range of 400 GeV/c /sup 2/ relative to 0/sup -/P, 2/sup -/P and the 2/sup +/D production phases. These features provide compelling evidence for a resonant A /sub 1/ of mass approximately 1280 MeV/c/sup 2/ and width approximately 300 MeV/c/sup 2/ and indeed a rescattering model with such a state fits the data well. (7 refs).
id cern-875217
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1979
record_format invenio
spelling cern-8752172019-09-30T06:29:59Zhttp://cds.cern.ch/record/875217engThompson, GThe $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$Particle Physics - ExperimentParticle Physics - PhenomenologyThe results are presented of partial wave analyses of almost 600000 events from the reaction pi /sup -/p to pi /sup -/ pi /sup -/ pi /sup +/p at 63 and 94 GeV/c and with a higher momentum transfer trigger. The shape of the 1/sup +/S ( rho pi ) mass spectrum changes substantially as a function of t, and is not compatible with predictions of the Deck model. In addition, the phase of this partial wave rises by approximately 90 degrees over a mass range of 400 GeV/c /sup 2/ relative to 0/sup -/P, 2/sup -/P and the 2/sup +/D production phases. These features provide compelling evidence for a resonant A /sub 1/ of mass approximately 1280 MeV/c/sup 2/ and width approximately 300 MeV/c/sup 2/ and indeed a rescattering model with such a state fits the data well. (7 refs).oai:cds.cern.ch:875217oai:cds.cern.ch:1335811979
spellingShingle Particle Physics - Experiment
Particle Physics - Phenomenology
Thompson, G
The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title_full The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title_fullStr The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title_full_unstemmed The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title_short The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
title_sort $a_{1}$ meson produced at 63 and 94 gev/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$
topic Particle Physics - Experiment
Particle Physics - Phenomenology
url http://cds.cern.ch/record/875217
work_keys_str_mv AT thompsong thea1mesonproducedat63and94gevcinthereactionpiptopipipip
AT thompsong a1mesonproducedat63and94gevcinthereactionpiptopipipip

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