Summary
In this paper we present an analysis of 1268 π−p → nπ+π− interactions obtained in the 1.5 m BNHBC and in the 2 m CERN HBC exposed at the CERN proton-synchrotron to a π− beam of 11 GeV/c momentum. The total cross-section of this channel is evaluated to be σ=(0.7±0.1) mb, while the production cross-sections for the ρ0, f0 and g0 resonances are determined as\(\sigma _{\rho ^0 } = \left( {110 \pm 14} \right)\) μb,\(\sigma _{f^0 } = \left( {75 \pm 14} \right)\) μb,\(\sigma _{g^0 } = \left( {55 \pm 14} \right)\) μb. Some experimental behaviour of the π0 production is compared with the predictions of the OPE model with Dürr-Pilkuhn form factors, the OPE absorptive model, the Regge model and the absorptive Regge model.
Riassunto
Nel presente lavoro viene eseguita una analisi di 1268 interazioni ottenute nella BNHBC di 1.50 m e nella HBC di 2 m del CERN esposte al proto-sincrotrone del CERN ad un fascio di π− di 11 GeV/c di impulso. La sezione d’urto totale di questo canale risulta σ=(0.7±0.1) mb, mentre le sezioni d’urto per le risonanze ρ0, f0 e g0 sono stimate rispettivamente\(\sigma _{\rho ^0 } = \left( {110 \pm 14} \right)\) μb,\(\sigma _{f^0 } = \left( {75 \pm 14} \right)\) μb e\(\sigma _{g^0 } = \left( {55 \pm 14} \right)\) μb. Alcune caratteristiche sperimentali della produzione di ρ0 vengono confrontate con le predizioni del modello OPE con fattori di forma di Dürr e Pilkuhn, del modello OPE assorbitivo, del modello di Regge e di una versione assorbitiva del modello di Regge.
Резюме
В этой статье проводится анализ 1268 взаимодействий π−p → nπ+π−, полученных в 1.5 м BNHBC и в 2 м HBC в ЦЕРНе, экспонированных на протонном синхротроне в ЦЕРНе с пучком π−, имеущих импульс 11 ГэВ/с. Оценивается полное поперечное сечение в этом канале, оно равно σ=(0.7±0.1), мб, в то время как поперечные сечения для ρ0, f0 и g0 резонансов составляют\(\sigma _{\rho ^0 } = \left( {110 \pm 14} \right)\) мб,\(\sigma _{f^0 } = \left( {75 \pm 14} \right)\) мб и\(\sigma _{g^0 } = \left( {55 \pm 14} \right)\) мб. Некоторые экспериментальные аспекты рождения ρ0 сравниваются с предсказаинями ОРЕ модели с форм-факторами Дурра-Пилкухна, ОРЕ абсорбционной модели, модели Редзе и абсорбционной модели Редже.
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Caso, C., Conte, F., Benz, P. et al. Some aspects of the reaction π−p → nπ+π− at 11 GeV/c. Nuovo Cimento A (1965-1970) 62, 755–775 (1969). https://doi.org/10.1007/BF02819596
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DOI: https://doi.org/10.1007/BF02819596