Measurement of the Atmospheric Muon Spectrum from 20 to 3000 GeV
The L3 Collaboration
TL;DR
This paper presents a precise measurement of the atmospheric muon flux from 20 to 3000 GeV using the L3 spectrometer, providing detailed flux and charge ratio data across various energies and angles.
Contribution
It offers the first high-precision measurement of the atmospheric muon spectrum and charge ratio over a broad energy range with minimal systematic uncertainties.
Findings
Muon flux measured with 2.3% precision at 150 GeV
Charge ratio of muons is approximately 1.285
Flux and charge ratio data cover a wide energy and angular range
Abstract
The absolute muon flux between 20 GeV and 3000 GeV is measured with the L3 magnetic muon spectrometer for zenith angles ranging from 0 degree to 58 degree. Due to the large exposure of about 150 m2 sr d, and the excellent momentum resolution of the L3 muon chambers, a precision of 2.3 % at 150 GeV in the vertical direction is achieved. The ratio of positive to negative muons is studied between 20 GeV and 500 GeV, and the average vertical muon charge ratio is found to be 1.285 +- 0.003 (stat.) +- 0.019 (syst.).
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