Differences in $dE-dX$ for $μ$ and $μ-$ and its Effect on the Underground Charge Ratio - High Energy Physics - Phenomenology

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Abstract: Theoretical calculations predict a small fractional difference in energy lossfor $\mu^+$ and $\mu^-$ of the order of $0.15 %$ at high energies. This ispredominantly due to a $z^3$ term in an extended ionization $dE-dX$ relation,in analogy to the Barkas effect at low energies around the Bethe-Bloch maximum.The atmospheric muon energy spectrum is steeply falling off with approximately$E^{-3.7}$ and thus the small difference in $dE-dX$ between $\mu^+$ and $\mu^-$at high energies results in an amplified charge asymmetry of about $0.6 %$ manythousand meters water equivalent deep underground.

Autor: Juergen Reichenbacher

Fuente: https://arxiv.org/