# Neutrinos, DUNE and the world best bound on CPT violation

**Authors:** Gabriela Barenboim, Christoph Andreas Ternes, Mariam Tórtola  
**arXiv:** [1712.01714](https://arxiv.org/abs/1712.01714)  
**Date:** 2017-12-05  
**Summary page:** https://www.summarizepaper.com/en/paper/1712.01714v1/

## Key points

- CPT symmetry is a critical concept in physics, encompassing Charge Conjugation, Parity, and Time reversal.
- Violation of CPT symmetry poses a significant threat to our current understanding of the physical world.
- Neutrino oscillation experiments offer hope for enhancing our understanding by orders of magnitude and providing valuable insights into nature's foundations.
- Barenboim, Ternes, and Tórtola calculate the current bound on CPT violation for all neutrino mixing parameters and assess DUNE experiment's sensitivity to such violations.
- DUNE could detect CPT violation at a significance level exceeding 3σ if recent results from the T2K experiment accurately represent neutrino and antineutrino oscillations.
- DUNE has the capability to significantly improve existing bounds on specific parameters related to neutrino oscillations by at least one order of magnitude.
- Combining data from neutrinos and antineutrinos in oscillation analysis may lead to misleading solutions if CPT symmetry is violated in nature.

## Summary

In their work titled "Neutrinos, DUNE and the world best bound on CPT violation," authors Gabriela Barenboim, Christoph Andreas Ternes, and Mariam Tórtola delve into the critical concept of CPT symmetry. This fundamental aspect of our model building strategy in physics encompasses Charge Conjugation, Parity, and Time reversal. The potential violation of CPT symmetry poses a significant threat to our current understanding of the physical world. The authors highlight that while limits on the conservation of CPT symmetry from the Kaon system appear formidable, there is hope in the form of neutrino oscillation experiments. These experiments have the potential to enhance our understanding by orders of magnitude and provide valuable insights into the foundations of our approach to nature. Through their research, Barenboim, Ternes, and Tórtola calculate the current bound on CPT violation for all neutrino mixing parameters and assess how sensitive the DUNE experiment is to such violations. By deriving updated bounds from neutrino oscillation data, they demonstrate that if recent results from the T2K experiment accurately represent neutrino and antineutrino oscillations, DUNE could detect CPT violation at a significance level exceeding 3σ. Furthermore, their study reveals that DUNE has the capability to significantly improve existing bounds on specific parameters related to neutrino oscillations by at least one order of magnitude. They also explore the sensitivity of DUNE to other oscillation parameters in relation to potential violations of CPT symmetry. One intriguing finding presented by Barenboim et al. is that if CPT symmetry is indeed violated in nature, combining data from neutrinos and antineutrinos in oscillation analysis may lead to misleading or "imposter" solutions. This underscores the complexity and importance of accurately interpreting experimental results when exploring fundamental symmetries in particle physics. Overall, this work sheds light on how neutrino oscillation experiments can serve as powerful tools for investigating CPT symmetry violations and advancing our understanding of fundamental principles governing the universe.