Archivio Istituzionale della RicercaThe results of the analysis of a new data sample of p ¯ annihilations at rest on deuterium and hydrogen, taken at the CERN LEAR by the OBELIX spectrometer, are presented. The p ¯ d → π−p channel has been measured with a noticeable reduction of both the statistical and the systematic errors with respect to the previous OBELIX measurement and the branching ratio turns out to be (1.29±±0.07(stat)±0.05(syst))·10−5, in good agreement with the previous result. The p ¯ d→ρ−p→π−π0p channel has been investigated for the first time and the branching ratio is evaluated to be (2.9±0.4(stat)±0.5(syst))·10−5. Finally, as a check of the spectrometer absolute calibration, the p ¯ p→π+π− channel was also studied with a measured branching ratio of (4.27±0.15(stat)±0.17(syst))·10−3, in good agreement with the ASTERIX result.
A study of Pontecorvo reactions in antiproton deuterium annihilations at rest / V. G., Ableev; Agnello, Michelangelo; A., Andrighetto; F., Balestra; G., Bendiscioli; A., Bertin; E., Botta; T., Bressani; M., Bruschi; M. P., Bussa; L., Busso; D., Calvo; C., Cavion; B., Cereda; P., Cerello; C., Cicalò; M., Corradini; S., Costa; I., D’Antone; S., De Castro; A., Donzella; L., Fava; A., Feliciello; L., Ferrero; A., Filippi; V., Filippini; A., Fontana; D., Galli; R., Garfagnini; U., Gastaldi; B., Giacobbe; P., Gianotti; A., Grasso; C., Guaraldo; Iazzi, Felice; A., Lanaro; E., Lodi Rizzini; V., Lucherini; A., Maggiora; S., Marcello; U., Marconi; G., Maron; A., Masoni; Minetti, Bruno; P., Montagna; M., Morando; F., Nichitiu; D., Panzieri; G., Pauli; M., Piccinini; G., Piragino; M., Poli; G., Puddu; R. A., Ricci; E., Rossetto; A., Rotondi; A. M., Rozhdestvensky; A., Saino; P., Salvini; L., Santi; M. G., Sapozhnikov; N., Semprini Cesari; S., Serci; R., Spighi; P., Temnikov; S., Tessaro; F., Tosello; V. I., Tretyak; G., Usai; S., Vecchi; L., Venturelli; M., Villa; A., Vitale; A., Zenoni; A., Zoccoli; G., Zosi. - In: NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. A, NUCLEI, PARTICLES AND FIELDS. - ISSN 1124-1861. - 107:12(1994), pp. 2837-2852. [10.1007/BF02730960]
A study of Pontecorvo reactions in antiproton deuterium annihilations at rest
AGNELLO, MICHELANGELO;IAZZI, Felice;MINETTI, Bruno;
1994
Abstract
The results of the analysis of a new data sample of p ¯ annihilations at rest on deuterium and hydrogen, taken at the CERN LEAR by the OBELIX spectrometer, are presented. The p ¯ d → π−p channel has been measured with a noticeable reduction of both the statistical and the systematic errors with respect to the previous OBELIX measurement and the branching ratio turns out to be (1.29±±0.07(stat)±0.05(syst))·10−5, in good agreement with the previous result. The p ¯ d→ρ−p→π−π0p channel has been investigated for the first time and the branching ratio is evaluated to be (2.9±0.4(stat)±0.5(syst))·10−5. Finally, as a check of the spectrometer absolute calibration, the p ¯ p→π+π− channel was also studied with a measured branching ratio of (4.27±0.15(stat)±0.17(syst))·10−3, in good agreement with the ASTERIX result.
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https://hdl.handle.net/11583/1845563
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