MINOS Document 1443-v1

Cosmic Ray Muon Charge Ratio in the MINOS Far Detector

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Erik Beall
Updated by:
Erik Beall
Document Created:
09 Jan 2006, 11:04
Contents Revised:
09 Jan 2006, 11:04
Metadata Revised:
09 Jan 2006, 11:04
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The MINOS Far Detector is a 5.4 kiloton (5.2 kt steel plus 0.2 kt scintillator plus aluminum skin) magnetized
tracking calorimeter located 710 meters underground
in the Soudan mine in Northern Minnesota.
MINOS is the first large, deep underground detector
with a magnetic field and thus capable of making measurements of themomentum and charge of cosmic ray muons.

Despite encountering unexpected anomalies in distributions of the charge ratio ($N_{\mu^+}/N_{\mu^-}$) of cosmic muons, a method of cancelling systematic errors is proposed and demonstrated. The result is $R_{eff} = 1.346 \pm 0.002$ (stat) $\pm 0.016$ (syst) for the averaged charge ratio, and a result for a rising fit to slant depth of $R(X) = 1.300 \pm 0.008$ (stat) $\pm 0.016$ (syst) + $(1.8 \pm 0.3)\times
10^{-5} \times X$, valid over the range of slant depths from 2000 $<$ X $<$ 6000 MWE. This slant depth range corresponds to minimum surface muon energies between 750 GeV and 5 TeV.

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