Weak radiative decay Λ→nγ and the radiative capture reaction K−p→Σ(1385)γ

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ID: 272814
1993
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Abstract
The branching ratio for the $\ensuremath{\Lambda}$ weak radiative decay $\ensuremath{\Lambda}\ensuremath{\rightarrow}n\ensuremath{\gamma}$ has been measured. Three statistically independent results from the same experiment (Brookhaven E811) are reported here. They are combined with a previously published measurement, also from Brookhaven E811, to yield a result of $\frac{(\ensuremath{\Lambda}\ensuremath{\rightarrow}n\ensuremath{\gamma})}{(\ensuremath{\Lambda}\ensuremath{\rightarrow}\mathrm{anything})}=(1.75\ifmmode\pm\else\textpm\fi{}0.15)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, based on 1800 events after background subtraction. This represents a factor of 75 increase in statistics over the previous world total. A comparison with recent theoretical papers shows that no existing model provides a completely satisfactory description of all data on weak radiative decays. A search is also reported for the radiative capture process ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}\ensuremath{\Sigma}(1385)\ensuremath{\gamma}$ at rest. No signal was observed and an upper limit on the branching ratio of $\frac{[{K}^{\ensuremath{-}}p\ensuremath{\rightarrow}\ensuremath{\Sigma}(1385)\ensuremath{\gamma}]}{[{K}^{\ensuremath{-}}p\ensuremath{\rightarrow}\mathrm{anything}]}<4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ (90% C.L.) was determined.
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larson1993physicalweak Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors K. D. Larson;A. J. Noble;B. Bassalleck;H. Burkhardt;W. J. Fickinger;J. R. Hall;A. L. Hallin;M. D. Hasinoff;D. Horvath;P. G. Jones;J. Lowe;E. K. McIntyre;D. F. Measday;J. P. Miller;B. L. Roberts;D. K. Robinson;M. Sakitt;M. Salomon;S. Stanislaus;C. E. Waltham;T. M. Warner;D. A. Whitehouse;D. M. Wolfe;
Journal physical review d
Year 1993
DOI
doi:10.1103/PhysRevD.47.799
URL
https://doi.org/10.1103/physrevd.47.799
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