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Setting Limits on Supersymmetry Using Simplified Models
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First evidence for the decay B(s)(0)→μ+ μ-.

R Aaij1, C Abellan Beteta, A Adametz

  • 1Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.

Physical Review Letters
|February 7, 2013
PubMed
Summary
This summary is machine-generated.

Researchers searched for rare B(s) to muon plus muon minus and B0 to muon plus muon minus decays using LHCb data. They observed a significant excess for B(s) to muon plus muon minus, consistent with the Standard Model.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Standard Model

Background:

  • Rare B meson decays provide sensitive probes of fundamental physics.
  • Searches for B(s) to mu+ mu- and B0 to mu+ mu- decays test the Standard Model's predictions for flavor physics.

Purpose of the Study:

  • To search for the rare decays B(s) to mu+ mu- and B0 to mu+ mu-.
  • To measure the branching fraction of B(s) to mu+ mu- and set an upper limit for B0 to mu+ mu-.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment at the Large Hadron Collider.
  • Utilizing data samples from 2011 (at 7 TeV) and 2012 (at 8 TeV).
  • Employing a maximum-likelihood fit to determine branching fractions and significance.

Main Results:

  • Observed an excess of B(s) to mu+ mu- candidates with a signal significance of 3.5 standard deviations.
  • Measured the branching fraction of B(s) to mu+ mu- to be (3.2(-1.2)(+1.5))x10^-9.
  • Set an upper limit for the branching fraction of B0 to mu+ mu- at <9.4x10^-10 (95% confidence level).

Conclusions:

  • The observed B(s) to mu+ mu- decay rate is consistent with the Standard Model predictions.
  • The results provide stringent constraints on new physics beyond the Standard Model.