Study of thef0(1500)/f2(1565)production in the exclusive annihilationn̄p→π+π+π−in flight

Autor: Roberto Spighi, Antonietta Donzella, V.G. Ableev, Bruno Minetti, O. Gortchakov, A. Vitale, V.I. Tretyak, A. Collamati, Paola Salvini, A. Maggiora, N. Mirfakhrai, V. Lucherini, D. Bergo, L. Busso, S.N. Prakhov, E. Rossetto, L. Fava, P.P. Temnikov, M. Poli, A. Grasso, S. De Castro, M. Lombardi, M. Corradini, Alberto Masoni, Marco Bruschi, F. Nichitiu, G. Bendiscioli, D. Galli, G. Vedovato, G. Pauli, C. Scoglio, S. Serci, L. Valacca, D. Calvo, L. Venturelli, C. Guaraldo, Adriano Fontana, A M Rosca, Mauro Villa, Benedetto Giacobbe, A. Vezzani, D. Panzieri, M. Capponi, Paolo Montagna, Paola Gianotti, F. Tosello, C. Fanara, E. Lodi Rizzini, Umberto Marini Bettolo Marconi, M.P. Bussa, Alessandro Feliciello, S. Tessaro, Michelangelo Agnello, V. Filippini, Stefania Vecchi, C. Cavion, Aldo Zenoni, A.M. Rozhdestvensky, Antonio Ferretti, Massimo Piccinini, Felice Iazzi, Corrado Cicalo, G. Maron, Armando Lanaro, A. Saino, O. Y. Denisov, S. Marcello, S. Costa, F. D'Isep, G. L. Usai, F. Balestra, Tullio Bressani, U. Gastaldi, G. Puddu, L. Ferrero, Alberto Rotondi, C. Petrascu, N. Semprini Cesari, L. Vannucci, L. Santi, Elena Botta, F. Vigotti, R. Garfagnini, P. Cerello, A. Bertin, P. Damiani, A. Filippi, R. Donà, Antonio Zoccoli, M.G. Sapozhnikov
Rok vydání: 1998
Předmět:
Zdroj: Physical Review D. 57:55-66
ISSN: 1089-4918
0556-2821
Popis: The spin-parity analysis of the $\mathrm{n\ifmmode \bar{}\else \={}\fi{}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ exclusive reaction in flight is presented. The main aim is to study the $({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ 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 $(1522\ifmmode\pm\else\textpm\fi{}25) \mathrm{MeV}$ and $(108\ifmmode\pm\else\textpm\fi{}33) \mathrm{MeV}$, and a tensorial one ${(2}^{++})$ with mass $(1575\ifmmode\pm\else\textpm\fi{}18) \mathrm{MeV}$ and width $(119\ifmmode\pm\else\textpm\fi{}24) \mathrm{MeV}$, respectively. In addition, the analysis requires the presence of a scalar state at $(1280\ifmmode\pm\else\textpm\fi{}55) \mathrm{MeV}$, $(323\ifmmode\pm\else\textpm\fi{}13) \mathrm{MeV}$ broad, and of a second vectorial one, in addition to the ${\ensuremath{\rho}}^{0}(770)$ signal, with mass and width $(1348\ifmmode\pm\else\textpm\fi{}33) \mathrm{MeV}$ and $(275\ifmmode\pm\else\textpm\fi{}10) \mathrm{MeV}$, respectively.
Databáze: OpenAIRE
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