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Setting Limits on Supersymmetry Using Simplified Models

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Search for B(s)(0) → μ+ μ- and B(0) → μ+ μ- decays with CDF II.

T Aaltonen¹, B Álvarez González, S Amerio

¹Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.

Physical Review Letters

|December 21, 2011

Summary

This summary is machine-generated.

Researchers searched for rare B meson decays into muon pairs. The study found no evidence for B0 to muon pairs but observed an intriguing excess in B(s)0 to muon pairs, suggesting new physics possibilities.

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Area of Science:

Particle Physics
High-Energy Physics
Collider Physics

Background:

Rare B meson decays are sensitive probes of fundamental physics.
The decay B(s)0 → μ+ μ- is highly suppressed in the Standard Model, making it a key channel for searching for new physics beyond the Standard Model.

Purpose of the Study:

To search for the rare decays B(s)0 → μ+ μ- and B0 → μ+ μ-.
To set limits on or measure the branching fractions of these decays.

Main Methods:

Analysis of 7 fb(-1) of integrated luminosity data collected by the CDF II detector at the Fermilab Tevatron collider.
Candidate selection for B(s)0 and B0 mesons decaying into muon pairs.
Statistical analysis to determine significance and set limits.

Main Results:

An upper limit on the branching fraction of B(B0 → μ+ μ-) < 6.0 × 10(-9) at 95% confidence level was established.
An excess of B(s)0 candidates was observed, with a probability of 0.27% for background alone to produce such an excess.
The branching fraction for B(s)(0) → μ+ μ- was measured as (1.8(-0.9) (+1.1)) × 10(-8), with an upper limit of < 4.0 × 10(-8) at 95% confidence level.

Conclusions:

The results for B0 → μ+ μ- are consistent with Standard Model background expectations.
The observed excess in B(s)0 → μ+ μ- warrants further investigation and may hint at contributions from new physics phenomena.
The measurements provide stringent constraints on new physics scenarios.