Data di Pubblicazione:
2004
Abstract:
The spin-parity analysis of the data on the pp → 2π + 2π − annihilation reaction at rest in 50 MeV/c, collected liquid and in gaseous hydrogen at 3 bar pressure and in flight at p momentum of by the Obelix spectrometer at the LEAR complex of CERN, is presented. The relative branching ratios (a1 (1260) → σπ)/(a1 (1260) → ρπ) = 0.06 ± 0.05 and (π(1300) → σπ)/(π(1300) → ρπ) = 2.2 ± 0.4 are obtained. It is also shown that the inclusion of the exotic meson π1 (1400), J P C = 1−+ , mass and width M = 1.384 ± 0.028, Γ = 0.378 ± 0.058 GeV/c2 , in its decay to ρπ, improves the fit and some implications of these results are briefly discussed. The relative S and P -wave annihilation percentages in four charged pions at two target densities are obtained.
Tipologia CRIS:
1.1 Articolo in rivista
Elenco autori:
Salvini, P; Salvini, P; Tretyak, Vi; Filippini, V; Fontana, A; Montagna, P; Panzarasa, A; Rotondi, A; Bargiotti, M; Bertin, A; Bruschi, M; Capponi, M; Carbone, A; DE CASTRO, S; Fabbri, L; Faccioli, P; Galli, D; Giacobbe, B; Grimaldi, F; Marconi, U; Massa, I; Piccinini, M; Cesari, Ns; Spighi, R; Vecchi, S; Villa, M; Vitale, A; Zoccoli, A; Bianconi, Andrea; Corradini, Maurizio; Donzella, Antonietta; LODI RIZZINI, Evandro; Venturelli, Luca; Zenoni, Aldo; Cicalo, C; DE FALCO, A; Masoni, A; Puddu, G; Serci, S; Usai, G; Gorchakov, Oe; Prakhov, Sn; Rozhdestvensky, Am; Sapozhnikov, Mg; Poli, M; Gianotti, P; Guaraldo, C; Lanaro, A; Lucherini, V; Petrascu, C; Panzieri, D; Balestra, F; Bussa, Mp; Busso, L; Cerello, P; Denisov, O; Ferrero, L; Grasso, A; Maggiora, A; Tosello, F; Botta, E; Bressani, T; Calvo, D; DE MORI, F; Feliciello, A; Filippi, A; Marcello, S; Agnello, M; Iazzi, F.
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