Search for leptonic CP Violation: Insights from the contemporary experiments

by Zoya Vallari

Thursday 9 May 2024, 15:00 → 17:00 US/Eastern

small seminar room

Long-baseline experiments measure neutrino oscillations in accelerator produced muon neutrino and antineutrino beams to explore open questions about neutrino masses and mixing.  In the past two decades, neutrino oscillation experiments have made significant progress in measuring neutrino mixing. However, key questions, such as the mass ordering of the neutrinos and whether neutrinos violate charge-parity, remain unanswered. We measure the mixing parameters and mass splittings of neutrinos by searching for ${\nu }_{\mu }$ disappearance and ${\nu }_e$ appearance in a beam of muon neutrinos. Asymmetry in the rate of ${\nu }_e$ appearance in the ${\nu }_{\mu }$ beam with the rate of ${\overline{\nu }}_e$ appearance in the ${\overline{\nu }}_{\mu }$ beam offers a unique measure of potential charge-parity symmetry violation within the lepton sector.

The NOvA and T2K experiments are currently operational long-baseline experiments in the US and Japan. In this talk, I will present the latest results from the NOvA and the T2K experiments, providing a snapshot of the accelerator-based neutrino oscillation measurements. I will discuss the details of the new combined analysis of the datasets from the NOvA and the T2K experiments. This joint analysis utilizes the advantageous complementarity of the two experiments, which is useful for breaking degeneracies in the individual measurements and provides world-leading constraints on neutrino mass-splitting. Moreover, I will outline anticipated milestones over the next few years leading up to the commencement of the next generation of long-baseline experiments towards the end of the decade.

050924_NOvAT2K_JointFitResults_LeonaWoods_ZV.pdf