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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Search for the decays B_{(s)};{0} --> e;{+} micro;{-} and B_{(s)};{0} --> e;{+} e;{-} in CDF run II.

T Aaltonen¹, J Adelman, T Akimoto

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

Physical Review Letters

|June 13, 2009

Summary

Researchers searched for rare B meson decays, finding no evidence. This sets new limits on new physics, constraining leptoquark masses to over 47.8 TeV/c^2.

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Area of Science:

Particle Physics
High-Energy Physics
Standard Model Physics

Background:

The Standard Model (SM) of particle physics successfully describes fundamental particles and their interactions.
Rare B meson decays offer a unique window to probe for physics beyond the Standard Model.
Lepton flavor violation and flavor-changing neutral currents are highly suppressed in the SM, making their observation a sign of new physics.

Purpose of the Study:

To search for lepton flavor violating (LFV) decays B_{s}^{0} \to e^{+} \mu^{-} and B^{0} \to e^{+} \mu^{-}.
To search for flavor-changing neutral-current (FCNC) decays B_{s}^{0} \to e^{+} e^{-} and B^{0} \to e^{+} e^{-}.
To set upper limits on the branching ratios of these rare decays and derive constraints on new physics models, such as leptoquarks.

Main Methods:

Analysis of 2 fb^{-1} of integrated luminosity data from pp collisions at \sqrt{s} = 1.96 TeV.
Utilized the upgraded Collider Detector (CDF II) at the Fermilab Tevatron.
Employed Bayesian statistical methods to set upper limits at the 90% credibility level.

Main Results:

The observed number of candidate events for all searched decays was consistent with background expectations.
Established Bayesian upper limits on branching ratios: B(B_{s}^{0} \to e^{+} \mu^{-}) < 2.0 \times 10^{-7}, B(B^{0} \to e^{+} \mu^{-}) < 6.4 \times 10^{-8}, B(B_{s}^{0} \to e^{+} e^{-}) < 2.8 \times 10^{-7}, and B(B^{0} \to e^{+} e^{-}) < 8.3 \times 10^{-8}.
Derived lower bounds on Pati-Salam leptoquark masses: M_{LQ}(B_{s}^{0} \to e^{+} \mu^{-}) > 47.8 TeV/c^{2} and M_{LQ}(B^{0} \to e^{+} \mu^{-}) > 59.3 TeV/c^{2} at 90% credibility.

Conclusions:

The absence of signals for LFV and FCNC decays in B mesons provides stringent constraints on extensions to the Standard Model.
The derived limits place significant restrictions on the parameter space of leptoquark models.
This search contributes to the ongoing effort to uncover new physics phenomena at high energy scales.