STUDY OF THE OMEGA-PI(0) SYSTEM AT HIGH MASSES

The first results are presented on the study of the omega-pi-0 system produced in the charge-exchange reaction of pi-p scattering at the momenta 38 and 100 GeV/c. Together with the well known b1(0) (1235) and rho-3 (1690) mesons, in the mass spectrum of the omega-pi-0 system one observes a new neutral state with mass 2200 +/- 20 MeV and width 260 +/- 50 MeV, produced, like the rho-3, via one-pion exchange. This meson, X(2200), is a candidate for the 1- -multiplet. A possible interpretation is that it is a 2(3)D1 radial excitation of the rho-0 meson. Its production cross section at 38 GeV/c is sigma[pi-p --> X(2200)n]BR[X(2200) --> omega-pi-0] = 120 +/- 25 nb, and it falls off quadratically with increasing energy, which is consistent with one-pion exchange

GAMS RESULTS ON THE OMEGA-PI(0) SYSTEM

The first results on the omega-pi-0 system produced in the charge-exchange reaction of pi--p scattering at 38 GeV/c and 100 GeV/c are presented. The omega-pi-0 mass spectrum shows, alongside with the well-known b1(0) (1235) and rho-3(0) (1690) mesons, a new neutral state with mass 2200 +/- 20 MeV and width 260 +/- 50 MeV. This meson, X(2200), is produced like rho-3 through one-pion exchange. X(2200) is a candidate for the 1-- multiplet, and its possible interpretation is a 2(3)D1 excitation of the rho-0. Its production cross section at 3 S GeV/c is equal to sigma(pi--p --> Xn) . BR (X --> omega-pi-0) = 120 +/- 25 nb. Cross sections for b1 and rho-3 have also been measured. The energy dependences have been determined

NEW GAMS RESULTS ON MESON SPECTROSCOPY

Results on meson spectroscopy obtained in 1993 by the GAMS Collaboration are presented. Model-independent measurements of the omega --> etagamma decay branching ratio, as well as the observation of the X(1740) state in the K(s)0K(s)0 decay mode, are considered. The results on the partial-wave analysis of the omegapi0 and pi0pi0 systems produced at small momentum transfer in pi-p charge-exchange reactions are discussed. The experiments on resonant etaeta-system production on a central region of the pp interaction are also discussed

Study of the pi(0)pi(0) system in pp central collisions at 450 GeV/c

The effective mass spectrum of pi(0) pairs produced in pp central collisions (pp --> pf pi(0) pi(0)p(s)) at 450 GeV/c, root s = 29 GeV, below 1 GeV differs from that observed in peripheral charge exchange reactions, In particular, there is a large number of events between pi pi-threshold and 1 GeV, that interfere with f(0)(980) destructively. The possible existence of a broad S-wave state is suggested. (C) 1997 Published by Elsevier Science B.V

Observation of vertex factorisation breaking in central pp Interactions

Central pi(+)pi(-) events produced in pp interactions are studied in terms of correlations between the outgoing protons. It is observed there is more rho(0)(770) and f(2)(1270) production in reactions where the outgoing protons are on opposite sides of the beam. This effect is not attributable to the trigger or the experimental acceptance, and suggests that the vertices do not factorise