The weak radiative decay Ξ0→Λe+e− has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15±5 events. We determine the branching fraction, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter α(ΞΛee) =−0.8±0.2, consistent with that of Ξ0→Λγ. The charge conjugate reaction has also been observed.
First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ0→Λe+e−
BALDINI, Wander;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;SCARPA, MARCELLA;
2007
Abstract
The weak radiative decay Ξ0→Λe+e− has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15±5 events. We determine the branching fraction, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter α(ΞΛee) =−0.8±0.2, consistent with that of Ξ0→Λγ. The charge conjugate reaction has also been observed.File in questo prodotto:
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