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.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)