CPT and CP, an entangled couple

Abstract

Even though it is undoubtedly very appealing to interpret the latest T2K results as evidence of CP violation, this claim assumes CPT conservation in the neutrino sector to an extent that has not been tested yet. As we will show, T2K results are not robust against a CPT-violating explanation. On the contrary, a CPT-violating CP-conserving scenario is in perfect agreement with current neutrino oscillation data. Therefore, to elucidate whether T2K results imply CP or CPT violation is of utter importance. We show that, even after combining with data from NO$\nu$A and from reactor experiments, no claims about CP violation can be made. Finally, we update the bounds on CPT violation in the neutrino sector.

8 pages, 6 figures

References in corpus (13)

• Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of theta_23, delta_CP, and the mass ordering
• Simulation of long-baseline neutrino oscillation experiments with GLoBES
• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
• Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations
• Current unknowns in the three neutrino framework
• Neutrinos as the messengers of CPT violation
• Spectral Measurement of the Electron Antineutrino Oscillation Amplitude and Frequency using 500 Live Days of RENO Data
• On the Determination of Leptonic CP Violation and Neutrino Mass Ordering in Presence of Non-Standard Interactions: Present Status
• Neutrinos, DUNE and the world best bound on CPT invariance
• Evidence for leptonic CP phase from NO$\nu$A, T2K and ICAL: A chronological progression
• Neutrino vs. Antineutrino Oscillation Parameters at DUNE and Hyper-Kamiokande
• New physics vs new paradigms: distinguishing CPT violation from NSI

Cited by in corpus (6)

• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
• Non-unitary neutrino mixing in short and long-baseline experiments
• Impact of high energy beam tunes on the sensitivities to the standard unknowns at DUNE
• Constraining CPT violation with Hyper-Kamiokande and ESSnuSB
• Stringent constraint on CPT violation with the synergy of T2K-II, NO$\nu$A extension, and JUNO
• Analytic formulae for T violation in neutrino oscillations