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Measurement of B(D+-->K(*0)l(+)nu(l))
G Brandenburg1, A Ershov, D Y-J Kim
1Harvard University, Cambridge, Massachusetts 02138, USA.
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
- 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.
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