In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi0 --> Lambda gamma have been found with an estimated background of 58±8 events. From these events the Xi0 --> Lambda gamma decay asymmetry has been determined to α(Xi0 --> Lambda gamma)=−0.78±0.18stat±0.06syst, which is the first evidence of a decay asymmetry in Xi0 --> Lambda gamma. The branching fraction of the decay has been measured to be Br(Xi0 --> Lambda gamma)=(1.16±0.05stat±0.06syst)×10−3.
Measurement of the Xi0 --> Lambda gamma decay asymmetry and branching fraction
CONTALBRIGO, Marco;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
2004
Abstract
In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi0 --> Lambda gamma have been found with an estimated background of 58±8 events. From these events the Xi0 --> Lambda gamma decay asymmetry has been determined to α(Xi0 --> Lambda gamma)=−0.78±0.18stat±0.06syst, which is the first evidence of a decay asymmetry in Xi0 --> Lambda gamma. The branching fraction of the decay has been measured to be Br(Xi0 --> Lambda gamma)=(1.16±0.05stat±0.06syst)×10−3.File in questo prodotto:
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