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K−-meson absorptions at rest in carbon nuclei leading to final states containing a Λ-hyperon

Поглошения K− меэона в покое в ядрах углерода, которые приводят к конечным состояниям, содержашим Λ-гиперон

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Il Nuovo Cimento A (1965-1970)

Summary

A study has been made of K−-meson interactions at rest in the CERN 1.1 m3 heavy-liquid bubble chamber filled with a mixture of hydrocarbons. The emission frequency of Λ0-hyperons following K−-meson absorptions in carbon nuclei is determined to be 0.68 ± 0.02. A detailed study of the (Λ0π−) final state has allowed an estimate to be made of the internal-conversion probabilityC(Σ+) of ⌆+-hyperons produced in association with π−-mesons. The result isC(Σ+)=0.62 ± 0.02. The contribution of the direct channel to the (Λ0π−) final state is found to be 0.23 ± 0.01. The results are compared with those obtained for other absorbing media.

Riassunto

Si è fatto uno studio delle interazioni del mesone K− a riposo nella camera a bolle a liquido pesante di 1.1 m3 del CERN riempita con una miscela di idrocarburi. La frequenza di emissione degli iperoni Λ0 a seguito degli assorbimenti dei mesoni K− nei nuclei di carbonio è stata determinata essere 0.68 ± 0.02. Uno studio dettagliato dello stato finale (Λ0π−) ci ha permesso di fare una stima della probabilità di conversione internaC(Σ+) degli iperoni Σ+ prodotti in associazione coi mesoni π−. Il risultato èC(Σ+)=0.62 ± 0.02. Si trova che il contributo del canale diretto allo stato finale di (Λ0π−) è 0.23 ± 0.01. I risultati sono confrontati con quelli ottenuti per altri mezzi assorbenti.

Реэюме

Исследуются вэаимодействия K− меэонов в покое в ЦЕРНе на 1.1 м3 тяжеложидкостной пуэырьковой камере, наполненной смесью углеводородов. Определено, что частота змиссии Л0-гиперонов в реэультате поглошения K−-меэонов в ядрах углерода составляет 0.68±0.02. Подробное исследование конечного состояния (Λ0 π−) поэволяет оценить вероятность внутренней конверсии,C(Σ+), Σ+-гиперонов, обраэованных совместно с π−-меэонами. Получается, чтоC(Σ+)=0.62±0.02. Обнаружено, что вклад прямого канала в конечное состояние (Λ0π−) составляет 0.23±0.01. Эти реэультаты сравниваются с реэультатами, полученными для других поглошаюших сред.

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Author notes

  1. C. Vander Velde-Wilquet, J. Sacton & J. H. Wickens (Chercheur agréé)

    Present address: Inter-University Institute for High Energies (ULB-VUB), Brussels

  2. D. H. Davis & D. N. Tovee

    Present address: Department of Physics and Astronomy, University College, London

  3. C. Comber

    Present address: the Rutherford High Energy Laboratory, Chilton, Didcot, England

Authors and Affiliations

  1. l’Institut Interuniversitaire des Sciences Nucléaires, Belgique

    J. H. Wickens (Chercheur agréé)

  2. Department of Physics and Astronomy, University College, London

    C. Comber

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  1. C. Vander Velde-Wilquet
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Vander Velde-Wilquet, C., Sacton, J., Wickens, J.H. et al. K−-meson absorptions at rest in carbon nuclei leading to final states containing a Λ-hyperon. Nuov Cim A 38, 178–190 (1977). https://doi.org/10.1007/BF02724540

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