The spin-parity analysis of the n̄p⃗π+π+π- exclusive reaction in flight is presented. The main aim is to study the (π+π-) invariant mass spectrum in the region around 1500 MeV. The analysis was performed with a Breit-Wigner parametrization for all the resonant states and, for the scalar sector in the mass region below 1.2 GeV, by means of a K-matrix-like treatment. It clearly shows the need for two states, a scalar one (0++) with mass and width (1522±25) MeV and (108±33) MeV, and a tensorial one (2++) with mass (1575±18) MeV and width (119±24) MeV, respectively. In addition, the analysis requires the presence of a scalar state at (1280±55) MeV, (323±13) MeV broad, and of a second vectorial one, in addition to the ρ0(770) signal, with mass and width (1348±33) MeV and (275±10) MeV, respectively.

Study of the f0(1500)/f2(1565) production in the exclusive annihilation anti-n p --> pi+ pi+ pi- in flight

BALESTRA, Ferruccio;BOTTA, Elena;BRESSANI, Tullio;M. P. Bussa;BUSSO, Luigi;COSTA, Sergio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;
1998-01-01

Abstract

The spin-parity analysis of the n̄p⃗π+π+π- exclusive reaction in flight is presented. The main aim is to study the (π+π-) invariant mass spectrum in the region around 1500 MeV. The analysis was performed with a Breit-Wigner parametrization for all the resonant states and, for the scalar sector in the mass region below 1.2 GeV, by means of a K-matrix-like treatment. It clearly shows the need for two states, a scalar one (0++) with mass and width (1522±25) MeV and (108±33) MeV, and a tensorial one (2++) with mass (1575±18) MeV and width (119±24) MeV, respectively. In addition, the analysis requires the presence of a scalar state at (1280±55) MeV, (323±13) MeV broad, and of a second vectorial one, in addition to the ρ0(770) signal, with mass and width (1348±33) MeV and (275±10) MeV, respectively.
1998
57
55
66
antineutrons; anihilation; meson spectroscopy
A. Bertin; M. Bruschi; M. Capponi; A. Collamati; S. De Castro; R. Dona`; A. Ferretti; D. Galli; B. Giacobbe; U. Marconi; M. Piccinini; M. Poli;* N. Se...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/76974
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