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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
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First observation of a baryonic Bc+ decay.
R Aaij1, B Adeva2, M Adinolfi3
1Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Physical Review Letters
|November 7, 2014
Summary
Researchers observed a new baryonic decay for the B(c) meson (B(c)(+) → J/ψppπ(+)) for the first time. This finding helps determine the B(c) meson
Area of Science:
- Particle Physics
- High-Energy Physics
- Hadron Spectroscopy
Background:
- The B(c) meson is a unique particle containing both a charm and a bottom quark.
- Understanding its decays provides insights into fundamental forces and particle properties.
Purpose of the Study:
- To report the first observation of the baryonic decay B(c)(+) → J/ψppπ(+).
- To measure the ratio of branching fractions for this decay relative to a known channel.
- To determine the mass of the B(c) meson using this new decay mode.
Main Methods:
- Analysis of proton-proton collision data collected by the LHCb detector.
- Statistical analysis to establish the significance of the observed decay.
- Use of a normalization channel (B(c)(+) → J/ψπ(+)) for precise measurements.
Main Results:
- Observation of the B(c)(+) → J/ψppπ(+) decay with a significance of 7.3 standard deviations.
- Measurement of the branching fraction ratio: B(B(c)(+) → J/ψppπ(+))/B(B(c)(+) → J/ψπ(+)) = 0.143 ± 0.034(stat) ± 0.013(syst).
- Determination of the B(c)(+) meson mass: M(B(c)(+)) = 6274.0 ± 1.8(stat) ± 0.4(syst) MeV/c(2).
Conclusions:
- The first observation of this baryonic decay expands the known decay modes of the B(c) meson.
- The precise mass measurement contributes to the particle physics data.
- This study enhances our understanding of heavy quarkonium physics.
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