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A Measurement of lifetime difference in D0 meson decays

Collaboration
•
Nov, 2001
10 pages
Published in:
  • Phys.Rev.Lett. 88 (2002) 162001
e-Print:
DOI:
Report number:
  • KEK-PREPRINT-2001-143,
  • BELLE-PREPRINT-2001-18
Experiments:
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Abstract: (arXiv)
We report a measurement of the D0D^0-Dˉ0\bar{D}{}^0 mixing parameter yCPy_{CP} using 23.4 fb−1^{-1} of data collected near the Υ\Upsilon(4S) resonance with the Belle detector at KEKB. yCPy_{CP} is measured from the lifetime difference of D0D^0 mesons decaying into the K−π+K^-\pi^+ state and the CP even eigenstate K−K+K^-K^+. We find yCP=(−0.5±1.0−0.8+0.7)×10−2y_{CP}=(-0.5\pm 1.0{}^{+0.7}_{-0.8})\times10^{-2}, where the first error is statistical and the second systematic, corresponding to a 95% confidence interval −0.030<yCP<0.020-0.030 < y_{CP} < 0.020.
  • electron positron: colliding beams
  • electron positron: annihilation
  • D0: electroproduction
  • D0 anti-D0: mixing
  • D0: hadronic decay
  • amplitude analysis: CP
  • lifetime: difference
  • mass spectrum
  • BELLE
  • experimental results