The spin-parity analysis of the nbar p --> pi+pi+pi-exclusive reaction in flight is presented. The main aim is to study the (pi+pi-) 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 618) 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 rho0(770) signal, with mass and width (1348+-33) MeV and (275+-10) MeV, respectively.
Study of the f0(1500)/f2(1525) production in the exclusive annihilation in anti-n p -> pi+pi+pi- in flight.
FONTANA, ANDREA;MONTAGNA, PAOLO MARIA;ROTONDI, ALBERTO;
1998-01-01
Abstract
The spin-parity analysis of the nbar p --> pi+pi+pi-exclusive reaction in flight is presented. The main aim is to study the (pi+pi-) 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 618) 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 rho0(770) signal, with mass and width (1348+-33) MeV and (275+-10) MeV, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
