Measurement of the Xi0 --> Lambda gamma decay asymmetry and branching fraction
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- DOSANJH RS
- GERSHON TJ
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- KALMUS GE
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- PARKER MA
- WHITE TO
- WOTTON SA
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- VELASCO M
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- CONTALBRIGO M
- DALPIAZ P.
- DUCLOS J
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- EPPARD K
- EPPARD M
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- DA SILVA PL
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- PEPE M
- PICCINI M
- BERTANZA L
- CAROSI R
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- CERRI C
- CIRILLI M
- COSTANTINI F
- FANTECHI R
- GIUDICI S
- MANNELLI I
- PIERAZZINI G
- SOZZI M
- CHEZE JB
- COGAN J
- DE BEER M
- DEBU P
- FORMICA A
- DE CASSAGNAC RG
- MAZZUCATO E
- PEYAUD B
- TURLAY R
- VALLAGE B
- HOLDER M
- MAIER A
- ZIOLKOWSKI M
- ARCIDIACONO R
- BIINO C
- CARTIGLIA N
- GUIDA R
- MARCHETTO F
- MENICHETTI E
- PASTRONE N
- NASSALSKI J
- RONDIO E
- SZLEPER M
- WISLICKI W
- WRONKA S
- DIBON H
- FISCHER G
- JEITLER M
- MARKYTAN M
- MIKULEC I
- NEUHOFER G
- PERNICKA M
- TAUROK A
- WIDHALM L
- CA NA48 COLLABORATION
DOIAbstract
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
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