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

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. WalthamT. M. Warner, D. A. Whitehouse, D. M. Wolfe

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The branching ratio for the Λ weak radiative decay Λ→nγ 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 (Λ→nγ)(Λ→anything)=(1.750.15) ×10-3, 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-p→(1385)γ at rest. No signal was observed and an upper limit on the branching ratio of [K-p→(1385)γ][K-p→anything]<4×10-4 (90% C.L.) was determined.

Original languageEnglish
Pages (from-to)799-810
Number of pages12
JournalPhysical Review D
Issue number3
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Larson, K. D., Noble, A. J., Bassalleck, B., Burkhardt, H., Fickinger, W. J., Hall, J. R., Hallin, A. L., Hasinoff, M. D., Horvath, D., Jones, P. G., Lowe, J., McIntyre, E. K., Measday, D. F., Miller, J. P., Roberts, B. L., Robinson, D. K., Sakitt, M., Salomon, M., Stanislaus, S., ... Wolfe, D. M. (1993). Weak radiative decay Λ→nγ and the radiative capture reaction K-p→(1385)γ. Physical Review D, 47(3), 799-810. https://doi.org/10.1103/PhysRevD.47.799