Precise measurement of the sea level muon charge ratio

Abstract
A precise measurement of the charge ratio of near vertical muons at sea level has been made using the Durham spectrograph. Over 2*106 particles traversed the apparatus and 1.3*106 particles were successfully momentum analysed for 7 GeV/c<or approximately=P<or approximately=500 GeV/c. The charge ratio shows no evidence of sharp maxima or minima. The data suggest that the ratio has a broad maximum in the region of 30 GeV/c and this is consistent with an analysis of all previous measurements of the charge ratio.
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