Thursday, February 8, 2007, 3:00 pm — Small Seminar Room, Bldg. 510
Mass-induced oscillations between muon neutrinos and tau neutrinos have become the standard theory accounting for the zenith angle distribution of atmmospheric neutrinos. However, there are other models which are able to produce similar effects and they are of both theoretical and experimental interest. In this talk, a neutrino oscillation analysis between muon neutrinos and tau neutrinos is first presented using the Super-Kamiokande atmospheric neutrino data. Then, this standard oscillation is compaired with three categories of non-standard models: 1.oscillations between muon neutrinos and sterile neutrinos; 2. neutrino oscillations induced by violations of Lorentz invariance and CPT symmetry; 3. vanishing muon neutrinos caused by neutrino decoherence and neutrino decay. The minimum chi-square values of these different models are compared and it is found that the standard oscillation model fit the atmospheric neutrino observation better than non-standard ones significantly. Based on this, we are able to limit the allowable contributions of these non-standard effects.
Hosted by: David Jaffe
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