![]() ![]() Neutrino-nucleus quasi-elastic and 2p2h interactions up to 10 GeV. Inclusive charged-current neutrino-nucleus reactions. Two nucleon spectral function in infinite nuclear matter. Inclusive quasielastic charged-current neutrino-nucleus reactions. Neutrino reactions at accelerator energies. A neutrino interaction simulation program library NEUT. Measurements of π ±, K ± and proton double differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS. Measurements of π ± differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS. Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector. Evidence for the 2π decay of the \(\), Λ and proton production in protoncarbon interactions at 31 GeV/c with the NA61/SHINE spectrometer at the CERN SPS. Future measurements with larger datasets will test whether leptonic CP violation is larger than the CP violation in quarks.Ĭhristenson, J. Our results indicate CP violation in leptons and our method enables sensitive searches for matter–antimatter asymmetry in neutrino oscillations using accelerator-produced neutrino beams. The 3 σ confidence interval for δ CP, which is cyclic and repeats every 2π, is for the so-called normal mass ordering and for the inverted mass ordering. Here we report a measurement using long-baseline neutrino and antineutrino oscillations observed by the T2K experiment that shows a large increase in the neutrino oscillation probability, excluding values of δ CP that result in a large increase in the observed antineutrino oscillation probability at three standard deviations (3 σ). Until now, the value of δ CP has not been substantially constrained by neutrino oscillation experiments. This CP violation can be measured in muon neutrino to electron neutrino oscillations and the corresponding antineutrino oscillations, which are experimentally accessible using accelerator-produced beams as established by the Tokai-to-Kamioka (T2K) and NOvA experiments 10, 11. Leptonic mixing, which appears in the standard model’s charged current interactions 5, 6, provides a potential source of CP violation through a complex phase δ CP, which is required by some theoretical models of leptogenesis 7, 8, 9. It has been shown that CP violation in leptons could generate the matter–antimatter disparity through a process called leptogenesis 4. So far, CP violation has not been observed in non-quark elementary particle systems. However, CP violation in quarks is too small to support this explanation. Sakharov proposed 3 that CP violation is necessary to explain the observed imbalance of matter and antimatter abundance in the Universe. Violation of this CP symmetry was first observed in 1964 1, and CP violation in the weak interactions of quarks was soon established 2. The charge-conjugation and parity-reversal (CP) symmetry of fundamental particles is a symmetry between matter and antimatter. ![]()
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