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., A., Agnello, M., A., A., F., B., G., B., A., B., E., B., T., B., M., B., M. P., B., L., B., D., C., C., C., B., C., P., C., C., C., M., C., S., C., I., D., S., D.C., et al.. - 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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