Summary
Cross-sections of the reactions γ+p→p+π++π− and γ+p→p+π0+π0 have been measured at the 1.1 Gev Frascati electrosynchrotron for photon energiesE γ between 600 and 900 MeV, for five proton momenta and at fixed proton laboratory angleθ p=32°. The cross-sections of π+π− photoproduction exhibit behaviours in agreement with the Δ++ production; no immediate evidence is found of contribution of ππ interactions. The mean value of the ratio π+π−/π0π0 is 2.7±0.3.
Riassunto
Presso l’elettrosincrotrone da 1.1 GeV di Frascati sono state misurate le sezioni d’urto dei processi γ+p→p+π++π− e γ+p→p+π0+π0 nell’intervallo di energia del gamma incidente (600÷900) MeV per cinque valori dell’impulso del protone e ad angolo fisso del protone nel laboratorio (θ p=32°). Le sezioni d’urto della fotoproduzione di π+π− mostrano andamenti in buon accordo con l’ipotesi che questo processo sia dominato dal canale γ+p→Δ+++π−; non si hanno prove immediate di contributi dovuti a interazioni ππ. Il valor medio determinato sperimentalmente del rapporto π+π−/π0π0 è 2.7±0.3.
Реэюме
Были иэмерены поперечные сечения реакций γ+p→p+π++π− и γ+p→p+π0+π0 на 1.1 ГзВ злектросинхротроне Фраскати для знергий фотона Eг от 600 до 900 МзВ, для пяти импульсов протона и при фиксированном лабораторном угле протона θp=32°. Поперечные сечения фоторождения π+π− обнаруживают поведение, согласуюшееся с рождением Δ++. Не обнаружено непосредственного подтверждения вклада лл вэаимодействий. Средняя величина отнощения π+π−/π0π0 равна 2.7±0.3.
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References
Preliminary results have been published inLett. Nuovo Cimento,5, 93 (1972).
DUBNA Conference (1967).
Aachen-Berlin-Bonn-Hamburg-Heidelberg-München Collaboration: DESY 68/8 (1968).
P. Brinckmann andW. Mohr: Bonn Univ. PI I–111 (1970).
J. V. Allaby, H. L. Lynch andD. M. Ritson:Phys. Rev.,142, 887 (1966).
P. Stichel andM. Scholtz:Nuovo Cimento,34, 1381 (1964).
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Beneventano, M., D’Angelo, S., de Notaristefani, F. et al. Measurement of π+π− and π0π0 photoproduction differential cross-sections for incident γ-ray energies from 600 to 900 MeV. Nuov Cim A 15, 449–466 (1973). https://doi.org/10.1007/BF02734682
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DOI: https://doi.org/10.1007/BF02734682