OBSERVATION OF A NARROW SCALAR MESON AT 1450 MEV IN THE REACTION
PP-]PF(PI+PI-PI+PI-)P(S) AT 450 GEV/C USING THE CERN OMEGA-SPECTROMETER

ABATZIS, S
ANTINORI, F
BARBERIS, D
BARNES, RP
BAYES, A
and BEUSCH, W
CARNEY, JN
CLEWER, S
DAVIES, JP
DIBARI, D
and DODENHOFF, CJ
EVANS, D
FINI, R
FRENCH, BR
GHIDINI, B
and GIRONE, M
JACHOLKOWSKI, A
KINSON, JB
KIRK, A and
KULCHITSKY, Y
LENTI, V
LOCONSOLE, RA
MALJUKOV, S and
MANZARI, V
MINASHVILI, I
NAVACH, F
NORMAN, K
QUERCIGH, E
and ROMANOVSKY, V
RUSSAKOVICH, N
SEMENOV, A
SENE, M and
SENE, R
SOLOVJEV, A
TCHLATCHIDZE, G
VASSILIADIS, G and
VICHOU, I
BAILLIE, OV
VOTRUBA, MF

OBSERVATION OF A NARROW SCALAR MESON AT 1450 MEV IN THE REACTION PP-]PF(PI+PI-PI+PI-)P(S) AT 450 GEV/C USING THE CERN OMEGA-SPECTROMETER

Authors: S ABATZIS ANTINORI, F BARBERIS, D BARNES, RP BAYES, A and BEUSCH, W CARNEY, JN CLEWER, S DAVIES, JP DIBARI, D and DODENHOFF, CJ EVANS, D FINI, R FRENCH, BR GHIDINI, B and GIRONE, M JACHOLKOWSKI, A KINSON, JB KIRK, A and KULCHITSKY, Y LENTI, V LOCONSOLE, RA MALJUKOV, S and MANZARI, V MINASHVILI, I NAVACH, F NORMAN, K QUERCIGH, E and ROMANOVSKY, V RUSSAKOVICH, N SEMENOV, A SENE, M and SENE, R SOLOVJEV, A TCHLATCHIDZE, G VASSILIADIS, G and VICHOU, I BAILLIE, OV VOTRUBA, MF
Publication date: 1 January 1994
Publisher

Abstract

The reaction pp –> pf (pi+ pi- pi+ pi-)ps has been studied at 450 GeV/c in an experiment designed to search for gluonic states. In addition to the well known f1(1285), the pi+ pi- pi+ pi- mass spectrum shows evidence for two states previously 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 (GAMMA = 56 +/- 12 MeV) with I(J(PC)) = 0(0++) which decays to rho0pi+ pi-. The X(1900) could either be a single broad state (GAMMA = 370 +/- 70 MeV) with I(J(PC)) = 0(2++) or possibly two separate states

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