Title

Measurement of the decay asymmetry parameters in Ξ c0 → Ξ - π +

Document Type

Article

Publication Date

8-15-2001

Abstract

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξ decay asymmetry parameter in the decay Ξ → Ξ π . We find α = 0.26±0.18(stat) (syst); using the world average value of α = -0.456±0.014 we obtain α = -0.56±0.39(stat) (syst). The physically allowed range of a decay asymmetry parameter is -1 < α < + 1. Our result prefers a negative value: α is <0.1 at the 90% C.L. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models. c c Ξc -0.04 Ξ Ξc -0.09 Ξc 0 0 - + 0 +0.05 0 +0.10 0

Publication Name

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volume Number

63

First Page

1111021

Last Page

1111026

Issue Number

11

Article

111102

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