Interpretation of the Underground Muon Charge Ratio

Details Interpretation of the Underground Muon Charge Ratio Interpretation of the Underground Muon Charge Ratio

2009-06-19

arxiv.org/abs/0906.3726v1

Astropart.Phys.32:61-71,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/j.astropartphys.2009.06.

The MINOS experiment has observed a rise in the underground muon charge ratio $r_\mu$ = ${\mu^+/\mu^-}$. This ratio can be related to the atmospheric production ratios of ${\pi^+/\pi^-}$ and ${K^+/K^-}$. Our analysis indicates that the relevant variable for studying the charge ratio+ $\ecos$, rather than $\emu$. We compare a simple energy dependent parameterization of the rise in the charge ratio with more detailed previously published Monte Carlo simulations and an analytical calculation. We also estimate the size of two previously neglected effects in this context: the charge sign dependency of the dE/dx in rock, and the energy dependence of heavy primaries on the derived ${K^+/K^-}$ ratio.

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