Observation of a narrow scalar meson at 1450 MeV in the reaction pp→pf(π+π-π+π-)ps at 450 GeV/c using the CERN omega spectrometer

• Published in: Physics letters. B 1994-04, Vol.324 (3-4), p.509-514
• Main Authors: ABATZIS, S, ANTINORI, F, DODENHOFF, C. J, EVANS, D, FINI, R, FRENCH, B. R, GHIDINI, B, GIRONE, M, JACHOLKOWSKI, A, KINSON, J. B, KIRK, A, KULCHITSKY, Y, BARBERIS, D, LENTI, V, LOCONSOLE, R. A, MALJUKOV, S, MANZARI, V, MINASHVILI, I, NAVACH, F, NORMAN, K, QUERCIGH, E, ROMANOVSKY, V, RUSSAKOVICH, N, BARNES, R. P, SEMENOV, A, SENE, M, SENE, R, SOLOVJEV, A, TCHLATCHIDZE, G, VASSILIADIS, G, VICHOU, I, VILLALOBOS BAILLIE, O, VOTRUBA, M. F, BAYES, A, BEUSCH, W, CARNEY, J. N, CLAWER, S, DAVIES, J. P, DI BARI, D
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; High Energy Physics - Phenomenology; Mesons; Physics; Properties of specific particles; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(94)90231-3

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.