Study of Atmospheric Neutrino Oscillations Using p0 Events in SK-I

Details Study of Atmospheric Neutrino Oscillations Using p0 Events in SK-I Study of Atmospheric Neutrino Oscillations Using p0 Events in SK-I

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....3.1259n&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

As one of the ways to distinguish whether muon neutrinos are oscillating into tau neutrinos or sterile neutrinos, we have measured a double ratio Rπ0 ≡ (π 0 /µ)DATA /(π 0 /µ)MC for the atmospheric neutrino sample in superKamiokande. Since the single π 0 sample has a large NC fraction, the two scenarios make a difference in Rπ0 . To test our Monte Carlo simulation and to reduce the systematic uncertainty on RπSK , which is mainly due to neutrino cross sections and 0 pion nuclear effects, we made a measurement of Rπ0 in the 1kt water Cherenkov detector using the K2K beam neutrinos before oscillations. The measured RπSK 0 with the reduced uncertainty is more consistent with the νµ ↔ ντ hypothesis at the super-Kamiokande's best-fit oscillation parameters.

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