Cargando…

Study of $\overline{p}N$ annihilations into five pions

The preliminary analysis of four high statistic 5 pi data sets taken with the Crystal Barrel detector shows that at least two scalar states are needed to describe the data, the f/sub 0/(1370) with m =1395+or-40 MeV/c/sup 2/, Gamma =275+or-55 MeV/c/sup 2/ and the f/sub 0/(1500) with mass and width co...

Descripción completa

Detalles Bibliográficos
Autor principal: Thoma, U
Lenguaje:eng
Publicado: 2000
Materias:
Acceso en línea:https://dx.doi.org/10.1016/S0375-9474(00)00217-7
http://cds.cern.ch/record/477006
Descripción
Sumario:The preliminary analysis of four high statistic 5 pi data sets taken with the Crystal Barrel detector shows that at least two scalar states are needed to describe the data, the f/sub 0/(1370) with m =1395+or-40 MeV/c/sup 2/, Gamma =275+or-55 MeV/c/sup 2/ and the f/sub 0/(1500) with mass and width compatible with previous findings. The first one decays dominantly into sigma sigma and rho rho , the second one into sigma sigma and pi *(1300) pi . In addition to the dominant scalar intensity the pi *(1300) plays an important role in the 5 pi - dynamics. We found a mass of m=1375+or-40 MeV/c/sup 2/ and a width of Gamma =268+or-50 MeV/c/sup 2/ with a dominant decay into rho pi . The ( pi pi )/sub s/ pi decay of the pi *(1300) is less than 15% of its rho pi decay as expected for a radial excitation of the pi. (9 refs).