The parameter δCP can be considered as an angle that translates the degree of asymmetry between matter and antimatter. (IMAGE)

CNRS

The parameter δCP can be considered as an angle that translates the degree of asymmetry between matter and antimatter.

Caption

The parameter δCP can be considered as an angle that translates the degree of asymmetry between matter and antimatter. If it is 0 or 180°, there is no asymmetry. The maximum asymmetry is when this parameter is -90 or +90°. The results shown here give the best estimation to date for this parameter. For the first time, they exclude almost half of the possible values with a 99.7% (3σ) confidence level (grey area). The values 0º and 180º are excluded at 95% confidence level, which may indicate that the CP symmetry is violated in neutrino oscillations. The arrow shows the value that is the most compatible with the data: it is close to 90°, ie maximum asymmetry.

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© T2K Collaboration

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