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Determination of η→π+π−π0\eta \to \pi^+ \pi^- \pi^0 Dalitz plot slopes and asymmetries with the KLOE detector

Collaboration
Jan, 2008
15 pages
Published in:
  • JHEP 05 (2008) 006
e-Print:
DOI:
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Abstract: (arXiv)
We have studied, with the KLOE detector at the DAΦ\PhiNE Φ\Phi-Factory, the dynamics of the decay η→π+π−π0\eta\to\pi^+\pi^-\pi^0 using η\eta mesons from the decay ϕ→ηγ\phi\to\eta\gamma for an integrated luminosity L{\mathcal L} = 450 pb−1^{-1}. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. An alternative parametrization relates the π+π−π0\pi^+\pi^-\pi^0 slopes to that for η→3π0\eta\to 3\pi^0 showing the consistency of KLOE results for both channels. We also obtain the best confirmation of the CC-invariance in the η→π+π−π0\eta\to\pi^+\pi^-\pi^0 decay.
  • e+ e- experiments
  • eta decays
  • electron positron: colliding beams
  • electron positron: annihilation
  • Phi(1020): electroproduction
  • Phi(1020): radiative decay
  • eta: hadronic decay
  • final state: (pi+ pi- pi0)
  • Dalitz plot: slope
  • charge conjugation: invariance