Phi pi0 and Phi eta production in anti-proton annihilation at rest in a hydrogen gas target at NTP
Articolo
Data di Pubblicazione:
1995
Abstract:
Data of antiproton annihilation at rest in a hydrogen gas target at NTP have been collected with
the Obelix spectrometer exposed to the beam extracted from the LEAR accelerator of CERN. The
reactions pbar p --> Phi pi0 and Phi Eta have been studied. The analysis of the angular distribution of
the kaons emitted by the ~b decay has shown that the reaction ~p ~ ¢~" 0 occurs essentially from
3S 1 states with a production rate RrcrP = (2.46 ___ 0.23 _ 0.07) x 10 -4, while the rate from 1P 1
states is compatible with zero. Because of acceptance limitations, 3S 1 and 1p1 contributions to the
reaction ~p ~ ~br/could not be resolved and lower and upper limits for the production rate have
been measured with the middle value Rm. P = (0.87 + 0.21) x 10 -4. Also, for the phase-space
K+K-r/ events the production rate RN~ = (4.67 ___ 0.35) × 10 -4 has been measured. The thTr °
and th*/branching ratios in S- and P-waves (defined in the text) have been estimated in a model
dependent way. For the evaluation of the ~b~/ rate, a combination of our production rate and of
data obtained with a liquid target has been used. The ~b~r ° production rate, compared to our
preliminary value for the to~ -° production, confirms the strong violation of the OZI rule observed
in other experiments. No violation is apparent in the PhiEta production.
the Obelix spectrometer exposed to the beam extracted from the LEAR accelerator of CERN. The
reactions pbar p --> Phi pi0 and Phi Eta have been studied. The analysis of the angular distribution of
the kaons emitted by the ~b decay has shown that the reaction ~p ~ ¢~" 0 occurs essentially from
3S 1 states with a production rate RrcrP = (2.46 ___ 0.23 _ 0.07) x 10 -4, while the rate from 1P 1
states is compatible with zero. Because of acceptance limitations, 3S 1 and 1p1 contributions to the
reaction ~p ~ ~br/could not be resolved and lower and upper limits for the production rate have
been measured with the middle value Rm. P = (0.87 + 0.21) x 10 -4. Also, for the phase-space
K+K-r/ events the production rate RN~ = (4.67 ___ 0.35) × 10 -4 has been measured. The thTr °
and th*/branching ratios in S- and P-waves (defined in the text) have been estimated in a model
dependent way. For the evaluation of the ~b~/ rate, a combination of our production rate and of
data obtained with a liquid target has been used. The ~b~r ° production rate, compared to our
preliminary value for the to~ -° production, confirms the strong violation of the OZI rule observed
in other experiments. No violation is apparent in the PhiEta production.
Tipologia CRIS:
1.1 Articolo in rivista
Elenco autori:
V. G. Ableev a. i. M., Agnello b; F., Balestra c; G., Bendiscioli e; S., Bergamaschi e; A. Bertin e. E., Botta c; T., Bressani c; M., Bruschi e; M. P., Bussa c; L., Busso c; D., Calvo b; M. Capponi f. C., Cavion a; B., Cereda f; P. Cerello, C.; C., Cical6 h; M. Corradini d., ~.; S., Costa c; S., De Castro e; Denisov g, O. Y. u.; F., D'Isep c; A. Donzella d. L., Fava c; A. Feliciello c. L. Ferrero c. A. Filippi c. V., Filippini e; Fontana, Andrea; D., Galli ~; R., Garfagnini c; U., Gastaldi a; B., Giacobbe f; P., Gianotti i; O. E., Gorchakov g; A., Grasso c; C., Guaraldo i; F., Iazzi b; A., Lanaro i; E., Lodi Rizzini d; M. Lombardi a. V., Lucherini i; A., Maggiora c; S., Marcello c; U., Marconi e; G. V., Margagliotti J; A., Masoni h; B., Minetti b; Montagna, PAOLO MARIA; M., Morando k; F., Nichitiu i; L, ; D., Panzieri c; D., Parena e; P., Pauli J; C., Petrascu i; 2, ; M., Piccinini f; S., Prakhov g; G., Puddu h; A., Rosca i; 2, ; E., Rossetto; Rotondi, Alberto; A. M., Rozhdenstvensky g; A., Saino e; P., Salvini e; L., Santi 1; M. G., Sapozhnikov g; C., Scoglio e; N., Semprini Cesari f; S., Serci h; R., Spighi f; P., Temnikov h; S., Tessaro J; F., Tosello c; V. I., Tretyak g; G. L., Usai h; L., Vannucci a; S., Vecchi f; G., Vedovato a; L., Venturelli d; M., Villa f; A., Vitale f; A. Zenoni r. e., N.; A. Zoccoli, F.
Link alla scheda completa:
Pubblicato in: