Measurement of the decay asymmetry parameters in Ξc0→Ξ-π+

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξc0 decay asymmetry parameter in the decay Ξc0→Ξ-π+. We find αΞc0αΞ=0.26±0.18(stat)-0.04+0.05(syst); using the world average value of αΞ=-0.456±0.014 we obtain αΞc0=-0.56±0.39(stat)-0.09+0.10(syst). The physically a...
Ausführliche Beschreibung

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξc0 decay asymmetry parameter in the decay Ξc0→Ξ-π+. We find αΞc0αΞ=0.26±0.18(stat)-0.04+0.05(syst); using the world average value of αΞ=-0.456±0.014 we obtain αΞc0=-0.56±0.39(stat)-0.09+0.10(syst). The physically allowed range of a decay asymmetry parameter is -1<α<+1. Our result prefers a negative value: αΞc0 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. Ausführliche Beschreibung