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A Measurement of the decay asymmetry parameters in Xi0(c) ---> Xi- pi+

Collaboration
•
Nov, 2000
10 pages
Published in:
  • Phys.Rev.D 63 (2001) 111102
e-Print:
DOI:
Report number:
  • SLAC-REPRINT-2000-094,
  • CLNS-98-1586,
  • CLEO-98-15
Experiments:
  • CESR-CLEO-II
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200920132017202120241032
Abstract: (arXiv)
Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξc0\Xi_c^{0} decay asymmetry parameter in the decay Ξc0→Ξ−π+\Xi_c^{0} \to \Xi^{-} \pi^+. We find αΞc0αΞ=0.26±0.18(stat)−0.04+0.05(syst)\alpha_{\Xi_c^{0}} \alpha_{\Xi} = 0.26 \pm 0.18{(stat)}^{+0.05}_{-0.04}{(syst)}, using the world average value of αΞ=−0.456±0.014\alpha_{\Xi} = -0.456 \pm 0.014 we obtain αΞc0=−0.56±0.39(stat)−0.09+0.10(syst)\alpha_{\Xi_c^{0}} = -0.56 \pm 0.39{(stat)}^{+0.10}_{-0.09}{(syst)}. The physically allowed range of a decay asymmetry parameter is −1<α<+1-1<\alpha<+1. Our result prefers a negative value: αΞc0\alpha_{\Xi_c^{0}} is <0.1<0.1 at the 90% CL. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models.
  • electron positron: colliding beams
  • electron positron: annihilation
  • quark: charm
  • quark: pair production
  • Xi/c0: hadronic decay
  • mass spectrum: (Xi- pi+)
  • angular distribution: asymmetry
  • CP: violation
  • CLEO
  • experimental results