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# Measurement of the $\Xi^0 \rightarrow \Lambda gamma$ decay asymmetry and branching fraction

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 alpha(Xi0 -> Lambda gamma) = -0.78 +- 0.18_stat +- 0.06_syst, 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 +- 0.05_stat +- 0.06_syst) x 10^-3.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00021887
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Submitted on : Monday, June 14, 2004 - 3:46:39 PM
Last modification on : Saturday, November 27, 2021 - 3:41:40 AM

### Citation

A. Lai, D. Marras, A. Bevan, R S. Dosanjh, T J. Gershon, et al.. Measurement of the $\Xi^0 \rightarrow \Lambda gamma$ decay asymmetry and branching fraction. Physics Letters B, Elsevier, 2004, 584, pp.251-259. ⟨in2p3-00021887⟩

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