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Related Experiment Videos

Measurement of B(D+-->K(*0)l(+)nu(l)).

G Brandenburg1, A Ershov, D Y-J Kim

  • 1Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|December 18, 2002
PubMed

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Summary
This summary is machine-generated.

Researchers measured branching fraction ratios for D+ meson decays. The study found consistent ratios for electron and muon decays, indicating similar D+ meson decay patterns.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • Experimental Physics

Background:

  • The D+ meson is a key probe for studying weak interactions.
  • Understanding branching fractions is crucial for testing the Standard Model of particle physics.

Purpose of the Study:

  • To measure the branching fraction ratios R+(e), R+(mu), and R+(l) for D+ meson decays.
  • To determine the absolute branching fractions for D+ --> K*0 l+ nu(l) decays.

Main Methods:

  • Analysis of 13.53 fb^-1 of CLEO data.
  • Measurement of ratios of branching fractions for D+ --> K*0 l+ nu(l) and D+ --> K-pi+pi+ decays.

Main Results:

  • R+(e) = 0.74 ± 0.04 ± 0.05
  • R+(mu) = 0.72 ± 0.10 ± 0.05

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  • R+(l) = 0.74 ± 0.04 ± 0.05

    • Conclusions:

    • The measured ratios R+(e) and R+(mu) are consistent, supporting lepton universality in D+ meson decays.
    • The absolute branching fractions for D+ --> K*0 e+ nu(e) and D+ --> K*0 mu+ nu(mu) were determined with high precision.