Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-05-30
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 4 figures. Invited contribution to the NATO Advanced Research Workshop: Cosmic Radiation: From Astronomy To Particle
Scientific paper
Upward throughgoing muons in underground detectors are induced by atmospheric $\nu_\mu$ with energies in the $1-10^4 GeV$ range. The oscillations of atmospheric muon neutrinos should affect mainly those with energy smaller than $E_\nu \sim 50 GeV$, or $E_\mu \le 10 GeV$ . We analyzed the MACRO upward throughgoing muons data set, using the Multiple Coulomb Scattering to estimate the energy $E_\mu$ of muons crossing the detector. We analyzed the event distribution for six event subsamples with different values of $<\ell_\nu / E_\nu>$. The event distribution is in agreement with the hypothesis of neutrino oscillations with $\Delta m^2$ few times $10^{-3} eV^2$ and maximum mixing.
Bakari D.
Becherini Yvonne
Spurio Maurizio
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