Neutrino/Anti-neutrino oscillation analysis using non-identical atmospheric oscillation parameters

Neutrino oscillations are well described by mass square splittings and mixing angles of Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. Under the CPT symmetry, these oscillation parameters for neutrino and antineutrino are expected to be identical. Any difference in the measurement of neutrino and anti-neutrino oscillation parameters may indicate a hint for CPT violation or new physics. The Iron Calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) is a prime experiment aimed to resolve various issues in neutrino physics using atmospheric neutrino source with the earth matter effects. We present a search for difference in neutrino and anti-neutrino oscillation parameters assuming that the oscillation parameters of neutrinos governing survival probabilities (ν_μ→ ν_μ) are different from that describing for anti-neutrinos P(ν-bar_μ→ ν-bar_μ). We show the ICAL sensitivity to confirm a non-zero value of the differences as a result of four oscillation parameter fit technique