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Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

New limit on the lepton-flavor-violating decay μ+→e+γ.

J Adam1, X Bai, A M Baldini

  • 1Paul Scherrer Institut PSI, CH-5232 Villigen, Switzerland.

Physical Review Letters
|November 24, 2011
PubMed
Summary

Researchers searched for a rare muon decay (μ(+)→e(+)γ) using MEG detector data. The study established the most stringent upper limit to date on this lepton-flavor-violating decay, enhancing our understanding of fundamental particle physics.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Experimental Physics

Background:

  • The Standard Model of particle physics allows lepton flavor to be conserved.
  • Searches for lepton-flavor-violating (LFV) processes, such as muon to electron conversion, probe physics beyond the Standard Model.
  • The muon to electron gamma decay (μ(+)→e(+)γ) is a key LFV process to search for new physics.

Purpose of the Study:

  • To search for the lepton-flavor-violating decay μ(+)→e(+)γ.
  • To set a new world-leading upper limit on the branching ratio of this decay.

Main Methods:

  • Analysis of data collected by the MEG detector at the Paul Scherrer Institut during 2009 and 2010.
  • A likelihood analysis was performed on a dataset corresponding to 1.8×10(14) muon decays.
  • Statistical methods were employed to derive limits on the branching ratio.

Main Results:

  • A 90% Confidence Level (C.L.) upper limit of 2.4×10(-12) was set on the branching ratio of the μ(+)→e(+)γ decay.
  • This result represents the most stringent limit to date for this specific decay.
  • No evidence for the μ(+)→e(+)γ decay was found within the analyzed dataset.

Conclusions:

  • The search for μ(+)→e(+)γ has placed stringent constraints on potential new physics scenarios.
  • The obtained limit significantly narrows the parameter space for theories beyond the Standard Model.
  • Continued experimental efforts are crucial for further probing LFV processes and discovering new physics.