Atmospheric Neutrino Oscillation Analysis in Super-Kamiokande

Since the discovery of neutrino oscillations, physicists have devised numerous neutrino ex- periments to determine the values of oscillation parameters, including mixing angles, mass- squared differences, and CP violation. Super-Kamiokande remains one of the primary experi- ments for studying parameters specific to atmospheric neutrinos. This thesis focuses on a sensi- tivity study of the neutrino oscillation parameters using Monte Carlo simulations based on the Super-Kamiokande (SK) detector configuration. Unlike analyses using experimental data, this study employs simulated atmospheric neutrino events to explore the theoretical capabilities of the SK detector setup in constraining the oscillation parameters over 328 kton-years of expo- sure. Key results include the rejection of the no-oscillation case in favour of the oscillation case (sin2 θ23 = 0.451) with ∆χ2 = 1.02 for e-like events and 51.39 for μ-like events, the up-down asymmetry of atmospheric neutrinos of e-like and μ-like events to be 1.07 and 0.78 respectively, and finally, the determination of the 1σ confidence intervals for the oscillation parameters to be: sin2 θ23 = 0.451+0.103-0.018, sin2 θ13 = 0.020+0.030-0.014, ∆m232,31 = 2.40+0.213-0.301 × 10−3 eV2.