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Observation of a narrow scalar meson at 1450 MeV in the reaction pp→pƒ(π+ππ+π)ps at 450 GeV/c using the CERN Omega Spectrometer

Abstract : The reaction pp → pƒ(π + π − π + π − )p s has been studied at 450 GeV/ c in an experiment designed to search for gluonic states. In addition to the well known ƒ 1 (1285) , the π + π − π + π − mass spectrum shows evidence for two states pre only observed by the WA76 experiment, the X(1450) and X(1900). An analysis of the X(1450) shows that it is a relatively narrow state ( Γ = 56 ± 12 MeV) with I ( J PC ) = 0(0 ++ ) which decays to ϱ 0 π + π − . The X (1900) could either b single broad state ( Γ = 370±70 MeV) with I ( J PC ) = 0(2 ++ ) or possibly separate states.
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Submitted on : Tuesday, May 22, 2001 - 4:17:13 PM
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S. Abatzis, F. Antinori, D. Barberis, R P. Barnes, a C. Bayes, et al.. Observation of a narrow scalar meson at 1450 MeV in the reaction pp→pƒ(π+ππ+π)ps at 450 GeV/c using the CERN Omega Spectrometer. Physics Letters B, Elsevier, 1994, 324, pp.509-514. ⟨10.1016/0370-2693(94)90231-3⟩. ⟨in2p3-00012187⟩

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