4.8 Article

New Constraint on the Existence of the μ+ → e+ γ Decay

Journal

PHYSICAL REVIEW LETTERS
Volume 110, Issue 20, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.201801

Keywords

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Funding

  1. PSI as the host laboratory
  2. SNF (CH) [137738]
  3. DOE (USA) [DEFG02-91ER40679]
  4. INFN (Italy)
  5. MEXT KAKENHI (Japan) [22000004]
  6. Italian Ministry of University and Research (MIUR) [RBFR08XWGN]
  7. Grants-in-Aid for Scientific Research [22000004] Funding Source: KAKEN

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The analysis of a combined data set, totaling 3.6 X 10(14) stopped muons on target, in the search for the lepton flavor violating decay mu(+) -> e(+) gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 X 10(-13) (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

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