Measurement of Decay Parameters for $Ξ^{-} \to Λπ^{-}$ Decay

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dc.creatorFNAL E756 Collaboration
dc.creatorChakravorty, A.
dc.creatorDiehl, H. T.
dc.creatorDuryea, J.
dc.creatorGuglielmo, G.
dc.creatorHeller, K.
dc.creatorHo, P. M.
dc.creatorJames, C.
dc.creatorJohns, K.
dc.creatorKaplan, D. M
dc.creatorLongo, M. J.
dc.creatorLuk, K. B.
dc.creatorRameika, R.
dc.creatorRubin, H. A.
dc.creatorTeige, S.
dc.creatorThomson, G. B.
dc.creatorZou, Y.
dc.date2003-06-24
dc.date.accessioned2026-07-07T10:28:19Z
dc.date.available2026-07-07T10:28:19Z
dc.descriptionBased on 1.35 million polarized $Ξ^{-}$ events, we measure the parameter $ϕ_Ξ$ to be $-1.61^{\circ} \pm 2.66^{\circ} \pm 0.37^{\circ}$ for $Ξ^{-} \to Λπ^{-}$ decay. New results for the parameters $β_Ξ$ and $γ_Ξ$ are also presented. Assuming that the CP-violating phase-shift difference is negligible, we deduce the strong phase-shift difference between the P-wave and S-wave amplitudes of the $Λπ$ final state to be $3.17^{\circ} \pm 5.28^{\circ} \pm 0.73^{\circ}$. This strong phase-shift difference reduces the theoretical uncertainty in estimating the level of CP violation in $Ξ$-hyperon decay.
dc.descriptionTo be published in Physical Review Letters
dc.identifierhttps://arxiv.org/abs/hep-ex/0306047
dc.identifierhttp://arxiv.org/abs/hep-ex/0306047
dc.identifierPhys.Rev.Lett.91:031601,2003
dc.identifierdoi:10.1103/PhysRevLett.91.031601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177406
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of Decay Parameters for $Ξ^{-} \to Λπ^{-}$ Decay
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