2001/06/14 by The MACRO Collaboration, M. Ambrosio, R. Antolini +98 · 194 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Measurements of neutrino speed #Mixing (physics) #Muon #Neutrino #Neutrino Physics Research #Neutrino detector #Neutrino oscillation #Nuclear physics #Oscillation (cell signaling) #Particle physics #Particle physics theoretical and experimental studies #Physics #Solar neutrino #Solar neutrino problem #Sterile neutrino #hep-ex
paper · pdf · open access · doi:10.1016/s0370-2693(01)00992-3
published in Physics Letters B 517(1-2), 59-66 (Elsevier BV) · 7 pages 4 figures Submitted to Physics Letters B
arxiv created 2001/06/14 · openalex publication_date 2001/09/01 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below the MACRO detector shows anomalies in good agreement with two flavor νμ→ντ oscillations with maximum mixing and Δm2 around 0.0024 eV2. Exploiting the dependence of magnitude of the matter effect on oscillation channel, and using a set of 809 upward-going muons observed in MACRO, we show that the two flavor νμ→νs oscillation is disfavored with 99% C.L. with respect to νμ→ντ.