search for direct cp violation in $xi$ hyperon decay

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1、CLNS98/1587CLEO98-16SearchforDirectCPViolationinΞHyperonDecayCLEOCollaboration(February7,2008)AbstractUsingdatacollectedwiththeCLEOIIdetectorwehaveperformedasearchfordirectCPviolationintheΞhyperonsystem.CPviolationgivesrisetoanasymmetry,A,betweentheparity-violatingangulardistributionsofthedecaychai

2、nsΞ−→Λπ−,Λ→pπ−andΞ¯+→Λ¯π+,Λ¯→pπ¯+.IntheStandardModel,A≈10−4to10−5.IfCPviolationwerefoundatahigherlevelitcouldindicatethepresenceofnewphysics.WefindnoevidenceforCPviolation:A=−0.057±0.064±0.039.WealsoobtainAΞ=−0.070±0.064±0.045andα=0.49+0.06±0.10.Ξ¯−0.05PACSnumbers:14.20.Lq,14.20.Jn,14.65.Dw,13.30.-a

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