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Updated: Jul 22, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Measurement of the electroweak penguin process B-->X(s)l+l-
Researchers measured the branching fraction for B decays into strange quarks and dileptons. This study provides crucial data for understanding rare B meson decays and new physics beyond the Standard Model.
Area of Science:
- Particle Physics
- High Energy Physics
- Quantum Chromodynamics
Background:
- The Standard Model of particle physics predicts rare B meson decays.
- Understanding these decays can reveal new physics phenomena.
- Previous measurements of B-->X(s)l(+)l(-) were limited.
Purpose of the Study:
- To report the first measurement of the branching fraction for the inclusive decay B-->X(s)l(+)l(-).
- To analyze a large dataset of B meson pairs to improve precision.
Main Methods:
- Analysis of a data sample of 65.4 x 10^6 B meson pairs.
- Data collected using the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider.
- Measurement focused on dilepton masses greater than 0.2 GeV/c^2.
Main Results:
- The branching fraction for B-->X(s)l(+)l(-) was measured to be [6.1 +/-1.4(stat) +1.4-1.1(syst)] x 10^-6.
- This is the first measurement of this inclusive decay's branching fraction.
- Results provide a significant improvement in precision for this decay channel.
Conclusions:
- The measured branching fraction provides important constraints for theoretical models.
- This result contributes to the search for new physics beyond the Standard Model.
- Further studies with larger datasets will refine these measurements.
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