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Related Experiment Video

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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Evidence for the Strangeness-Changing Weak Decay Ξ_{b}^{-}→Λ_{b}^{0}π^{-}.

R Aaij¹, C Abellán Beteta², B Adeva³

¹European Organization for Nuclear Research (CERN), Geneva, Switzerland.

Physical Review Letters

|December 27, 2015

Summary

This summary is machine-generated.

This study reports the first observation of a rare strangeness-changing weak decay of the Xi_b^- baryon into a Lambda_b^0 baryon and a pion. This finding provides new insights into b baryon decays.

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Area of Science:

Particle Physics
High Energy Physics
Quantum Chromodynamics

Background:

The Standard Model of particle physics describes fundamental particles and forces.
Baryon decays provide crucial tests of the Standard Model.
Strangeness-changing weak decays are rare processes offering unique insights.

Purpose of the Study:

To perform the first search for the strangeness-changing weak decay Ξ_{b}^{-}→Λ_{b}^{0}π^{-}.
To measure the relative rate and branching fraction of this decay.
To contribute to the understanding of b hadron decays.

Main Methods:

Analysis of pp collision data collected by the LHCb detector.
Utilizing an integrated luminosity of 3.0 fb^{-1}.
Statistical analysis to establish the significance of the observed signal.

Main Results:

Observation of the Ξ_{b}^{-}→Λ_{b}^{0}π^{-} decay with a significance of 3.2 standard deviations.
Measurement of the relative rate f_{Ξ_{b}^{-}}/f_{Λ_{b}^{0}}B(Ξ_{b}^{-}→Λ_{b}^{0}π^{-}) = (5.7±1.8_{-0.9}^{+0.8})×10^{-4}.
Estimated branching fraction B(Ξ_{b}^{-}→Λ_{b}^{0}π^{-}) between (0.57±0.21)% and (0.19±0.07)%.

Conclusions:

The first evidence for the strangeness-changing weak decay Ξ_{b}^{-}→Λ_{b}^{0}π^{-} has been established.
The measured branching fraction provides a new data point for testing theoretical models of b baryon decays.
This discovery opens new avenues for exploring rare B baryon transitions.