$\overline{p}p$ annihilation into four charged pions at rest and in flight

The spin-parity analysis of the data on the pp to 2 pi /sup +/ 2 pi /sup $/annihilation reaction at rest in liquid and in gaseous hydrogen at 3 bar pressure and in flight at p momentum of approximately= 50 MeV/c, collected by the Obelix spectrometer at the LEAR complex of CERN, is presented. The rel...

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Detalles Bibliográficos
Autores principales: Salvini, P, Tretyak, V I, Filippini, V, Fontana, A, Montagna, P, Panzarasa, A, Rotondi, A, Bargiotti, M, Bertin, A, Bruschi, M, Capponi, M, Carbone, A, De Castro, S, Fabbri, Franco Luigi, Faccioli, P, Galli, D, Giacobbe, B, Grimaldi, F, Marconi, U, Massa, I, Piccinini, M, Cesari, N S, Spighi, R, Vecchi, S, Villa, M, Vitale, A, Zoccoli, A, Bianconi, A, Corradini, M, Donzella, A, Lodi-Rizzini, E, Venturelli, L, Zenoni, A, Cicalò, C, De Falco, A, Masoni, A, Puddu, G, Serci, S, Usai, G L, Gorchakov, O E, Prakhov, S N, Rozhdestvensky, A M, Sapozhnikov, M G, Poli, M, Gianotti, P, Guaraldo, C, Lanaro, A, Lucherini, V, Petrascu, C, Panzieri, D, Balestra, F, Bussa, M P, Busso, L, Cerello, P, Denisov, O, Ferrero, L, Grasso, A, Maggiora, A, Tosello, F, Botta, E, Bressani, Tullio, Calvo, D, De Mori, F, Feliciello, A, Filippi, A, Marcello, S, Agnello, M, Iazzi, F
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1140/epic/s2004-01811-8
http://cds.cern.ch/record/816737
Descripción
Sumario:The spin-parity analysis of the data on the pp to 2 pi /sup +/ 2 pi /sup $/annihilation reaction at rest in liquid and in gaseous hydrogen at 3 bar pressure and in flight at p momentum of approximately= 50 MeV/c, collected by the Obelix spectrometer at the LEAR complex of CERN, is presented. The relative branching ratios (a /sub 1/ (1260) to sigma pi )/(a/sub 1/(1260) to rho pi ) = 0.06 +or- 0.05 and ( pi (1300) to sigma pi )/( pi (1300) to rho pi ) = 2.2 +or- 0.4 are obtained. It is also shown that the inclusion of the exotic meson pi /sub 1/(1400), J/sup PC/ = 1/sup -+/, mass and width M = 1.384 +or- 0.028, Gamma = 0.378 +or- 0.058 GeV/c/sup 2/, in its decay to rho pi , 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. (53 refs).

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