Evidence for two narrow pp resonances at 2020 MeV and 2200 MeV

From the study of the reaction pi /sup -/p to p/sub F/pp pi /sup -/ using a fast proton (p/sub F/) trigger device in the CERN Omega spectrometer, the authors find evidence for two narrow pp states produced mainly in association with a Delta degrees (1232) and a N degrees (1520). The statistical sign...

Descripción completa

Detalles Bibliográficos
Autores principales: Benkheiri, P, Boucrot, J, Bouquet, B, Briandet, P, D'Almagne, B, Dang-Vu, C, De Rosny, G, Eisenstein, B I, Ferrer, A, Fleury, P, Grossetête, B, Irwin, G, Jacholkowski, A, Lahellec, A, Nguyen, H, Petroff, P, Richard, F, Rivet, P, Roudeau, P, Rougé, A, Rumpf, M, Six, J, Thénard, J M, Treille, D, Volte, A, Yaffe, D, Yiou, T P, Yoshida, H
Lenguaje:eng
Publicado: 1977
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(77)90477-4
http://cds.cern.ch/record/878584
Descripción
Sumario:From the study of the reaction pi /sup -/p to p/sub F/pp pi /sup -/ using a fast proton (p/sub F/) trigger device in the CERN Omega spectrometer, the authors find evidence for two narrow pp states produced mainly in association with a Delta degrees (1232) and a N degrees (1520). The statistical significance of each peak is greater than 6 standard deviations. Masses and natural widths of these resonances are respectively M/sub 1/=2020+or-3 MeV, Gamma /sub 1 /=24+or-12 MeV and M/sub 2/=2204+or-5 MeV, Gamma /sub 2/=16/sub -16 //sup +20/ MeV. The data are consistent with a small production of the narrow approximately 1935 MeV resonance already reported. Production cross sections for these new pp resonances are given. (8 refs).

Ejemplares similares