Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-04-07
Phys.Rev.D62:032001,2000
Physics
High Energy Physics
High Energy Physics - Experiment
11 pages, 8 figures, to appear in Phys. Rev. D (2000)
Scientific paper
10.1103/PhysRevD.62.032001
We present a new measurement of air shower muons made during atmospheric ascent of the High Energy Antimatter Telescope balloon experiment. The muon charge ratio mu+ / mu- is presented as a function of atmospheric depth in the momentum interval 0.3-0.9 GeV/c. The differential mu- momentum spectra are presented between 0.3 and about 50 GeV/c at atmospheric depths between 13 and 960 g/cm^2. We compare our measurements with other recent data and with Monte Carlo calculations of the same type as those used in predicting atmospheric neutrino fluxes. We find that our measured mu- fluxes are smaller than the predictions by as much as 70% at shallow atmospheric depths, by about 20% at the depth of shower maximum, and are in good agreement with the predictions at greater depths. We explore the consequences of this on the question of atmospheric neutrino production.
Barwick Steve W.
Beatty James J.
Bhattacharyya Arnab
Bower Charles R.
Chaput C.
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