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 NOνA and from reactor experiments, no claims about CP violation can be made. Finally, we update the bounds on CPT violation in the neutrino sector.
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P.F. de Salas, D.V. Forero, C.A. Ternes, M. Tórtola and J.W.F. Valle, Status of neutrino oscillations 2018: 3σ hint for normal mass ordering and improved CP sensitivity, Phys. Lett. B 782 (2018) 633 [arXiv:1708.01186] [INSPIRE].
F. Capozzi, E. Lisi, A. Marrone and A. Palazzo, Current unknowns in the three neutrino framework, Prog. Part. Nucl. Phys. 102 (2018) 48 [arXiv:1804.09678] [INSPIRE].
I. Esteban, M.C. Gonzalez-Garcia, A. Hernandez-Cabezudo, M. Maltoni and T. Schwetz, Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of θ23, δCP and the mass ordering, JHEP 01 (2019) 106 [arXiv:1811.05487] [INSPIRE].
T2K collaboration, Constraint on the matter-antimatter symmetry-violating phase in neutrino oscillations, Nature 580 (2020) 339 [arXiv:1910.03887] [INSPIRE].
NOvA collaboration, First Measurement of Neutrino Oscillation Parameters using Neutrinos and Antineutrinos by NOvA, Phys. Rev. Lett. 123 (2019) 151803 [arXiv:1906.04907] [INSPIRE].
M. Ghosh, P. Ghoshal, S. Goswami and S.K. Raut, Evidence for leptonic CP phase from NOνA, T2K and ICAL: A chronological progression, Nucl. Phys. B 884 (2014) 274 [arXiv:1401.7243] [INSPIRE].
I. Esteban, M.C. Gonzalez-Garcia and M. Maltoni, On the Determination of Leptonic CP-violation and Neutrino Mass Ordering in Presence of Non-Standard Interactions: Present Status, JHEP 06 (2019) 055 [arXiv:1905.05203] [INSPIRE].
L.S. Miranda, P. Pasquini, U. Rahaman and S. Razzaque, Searching for non-unitary neutrino oscillations in the present T2K and NOνA data, arXiv:1911.09398 [INSPIRE].
G. Barenboim, C.A. Ternes and M. Tórtola, Neutrinos, DUNE and the world best bound on CPT invariance, Phys. Lett. B 780 (2018) 631 [arXiv:1712.01714] [INSPIRE].
Daya Bay collaboration, Measurement of the Electron Antineutrino Oscillation with 1958 Days of Operation at Daya Bay, Phys. Rev. Lett. 121 (2018) 241805 [arXiv:1809.02261] [INSPIRE].
RENO collaboration, Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO, Phys. Rev. Lett. 121 (2018) 201801 [arXiv:1806.00248] [INSPIRE].
T2K collaboration, Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam, Phys. Rev. Lett. 124 (2020) 161802 [arXiv:1911.07283] [INSPIRE].
T2K collaboration, Search for CP-violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2 × 1021 Protons on Target, Phys. Rev. Lett. 121 (2018) 171802 [arXiv:1807.07891] [INSPIRE].
NOvA collaboration, New constraints on oscillation parameters from νe appearance and νμ disappearance in the NOvA experiment, Phys. Rev. D 98 (2018) 032012 [arXiv:1806.00096] [INSPIRE].
Daya Bay collaboration, Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment, Phys. Rev. D 95 (2017) 072006 [arXiv:1610.04802] [INSPIRE].
Daya Bay collaboration, Improved Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay, Chin. Phys. C 41 (2017) 013002 [arXiv:1607.05378] [INSPIRE].
RENO collaboration, Spectral Measurement of the Electron Antineutrino Oscillation Amplitude and Frequency using 500 Live Days of RENO Data, Phys. Rev. D 98 (2018) 012002 [arXiv:1610.04326] [INSPIRE].
RENO collaboration, RENO: An Experiment for Neutrino Oscillation Parameter θ13 Using Reactor Neutrinos at Yonggwang, arXiv:1003.1391 [INSPIRE].
P. Huber, M. Lindner and W. Winter, Simulation of long-baseline neutrino oscillation experiments with GLoBES (General Long Baseline Experiment Simulator), Comput. Phys. Commun. 167 (2005) 195 [hep-ph/0407333] [INSPIRE].
P. Huber, J. Kopp, M. Lindner, M. Rolinec and W. Winter, New features in the simulation of neutrino oscillation experiments with GLoBES 3.0: General Long Baseline Experiment Simulator, Comput. Phys. Commun. 177 (2007) 432 [hep-ph/0701187] [INSPIRE].
T2K collaboration, Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5 × 1021 protons on target, Phys. Rev. D 96 (2017) 011102 [arXiv:1704.06409] [INSPIRE].
G. Barenboim, C.A. Ternes and M. Tórtola, New physics vs. new paradigms: distinguishing CPT violation from NSI, Eur. Phys. J. C 79 (2019) 390 [arXiv:1804.05842] [INSPIRE].
A. de Gouvêa and K.J. Kelly, Neutrino vs. Antineutrino Oscillation Parameters at DUNE and Hyper-Kamiokande, Phys. Rev. D 96 (2017) 095018 [arXiv:1709.06090] [INSPIRE].
DUNE collaboration, The DUNE Far Detector Interim Design Report Volume 1: Physics, Technology and Strategies, arXiv:1807.10334 [INSPIRE].
DUNE collaboration, Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II DUNE Physics, arXiv:2002.03005 [INSPIRE].
G. Barenboim, L. Borissov, J.D. Lykken and A. Smirnov, Neutrinos as the Messengers of CPT Violation, JHEP 10 (2002) 001 [hep-ph/0108199] [INSPIRE].
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Barenboim, G., Ternes, C.A. & Tórtola, M. CPT and CP, an entangled couple. J. High Energ. Phys. 2020, 155 (2020). https://doi.org/10.1007/JHEP07(2020)155
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DOI: https://doi.org/10.1007/JHEP07(2020)155