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Related Experiment Videos

Search for D0-&Dmacr;( 0) mixing

Xu1

  • 1Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

Researchers searched for D0-Dbar mixing using the "wrong-sign" D0-->K+pi(-) decay. The study found no significant evidence for mixing, constraining the parameters x' and y' to very small values.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Flavor Physics

Background:

  • D0-Dbar mixing is a phenomenon in particle physics where a D0 meson oscillates into its antiparticle, the Dbar(0) meson.
  • The

Purpose of the Study:

  • To search for evidence of D0-Dbar mixing.
  • To precisely measure the rate of the doubly Cabibbo-suppressed decay D0-->K+pi(-).
  • To constrain the parameters describing D0-Dbar mixing, x(") and y(").

Main Methods:

  • Analysis of 9.0 fb(-1) of e(+)e(-) collision data at sqrt[s] approx 10 GeV using the CLEO II.V detector.
  • Measurement of the relative rate of the wrong-sign D0-->K+pi(-) decay to the Cabibbo-favored &Dmacr;(0)-->K+pi(-) decay.
  • Study of the time-dependent decay rates of D0-->K+pi(-) to differentiate mixing from direct decay.

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Main Results:

  • The relative rate of the wrong-sign decay was measured to be R = (0.332(+0.063)(-0.065) +/- 0.040)%.
  • The amplitudes describing D0-Dbar mixing, x(") and y("), were found to be consistent with zero.
  • At 95% C.L., upper limits were set: (1/2)x("2) < 0.041% and -5.8% < y(") < 1.0%.

Conclusions:

  • The study found no significant evidence for D0-Dbar mixing.
  • The results provide stringent constraints on the parameters governing D0-Dbar mixing.
  • This analysis contributes to the understanding of flavor physics and CP violation in the charm sector.