Neutrinos Through the Looking-Glass

quarta-feira, 19 Agosto, 2020 - 16:15
Profa. Renata Zukanovich Funchal (IFUSP)
CP (charge conjugation and parity) symmetry and its violation is a fundamental ingredient to comprehend the matter-antimatter asymmetry of the Universe.
Although the Standard Model of particle physics can accommodate CP violation,
it is not predicted by the model. Since 1964 we know that CP is violated in the neutral kaon system. In the early 2000s direct CP violation was  established with both  K-mesons and B-mesons. Recently, in 2019, the LHCb experiment at CERN has also confirmed CP violation with D-mesons. The observed CP violation, however, is too small to explain the matter-antimatter disparity of the Universe.

In this colloquium we will discuss the quest for CP violation in the most elementary particle system: neutrinos. In particular, we will focus our attention on the lastest results of the accelerator experiments T2K and NOvA, which are the most sensitive experiments at the moment to CP violation in the leptonic sector. Arguably, the importance of observing CP violation in the leptonic sector is connected to Leptogenesis, a class of scenarios where the baryon asymmetry of the Universe can be generated by a lepton asymmetry.

Our aim is to try to answer the question: can we already say that  neutrinos and antineutrinos do not oscillate in the same way?
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