We studied the radiative muon decay μ+→e+νν¯γ by using for the first time an almost fully polarized muon source. We identified a large sample (∼13,000) of these decays in a total sample of 1.8×1014 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio B(μ→eνν¯γ)=(6.03±0.14(stat.)±0.53(sys.))×10−8 for Ee>45 MeV and Eγ>40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for μ+→e+γ process.

Measurement of the radiative decay of polarized muons in the MEG experiment

TASSIELLI, GIOVANNI FRANCESCO;
2016-01-01

Abstract

We studied the radiative muon decay μ+→e+νν¯γ by using for the first time an almost fully polarized muon source. We identified a large sample (∼13,000) of these decays in a total sample of 1.8×1014 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio B(μ→eνν¯γ)=(6.03±0.14(stat.)±0.53(sys.))×10−8 for Ee>45 MeV and Eγ>40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for μ+→e+γ process.
2016
MC Simulation
SM Expectation
Muon Decay
Individual Uncertainty Source
Photon Energy Spectrum
Photon Detection Efficiency
Neutral Pion
Total Covariance Matrix
Acceptance Factor
Signal Window
QED Correction
Liquid Xenon
Kinematic Region
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12606/27284
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