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Broken<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>τ</mml:mi></mml:math>symmetry and leptonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>violation
We propose that leptonic $CP$ violation arises from a breaking of the $\ensuremath{\mu}\mathrm{\text{\ensuremath{-}}}\ensuremath{\tau}$ exchange symmetry in the neutrino mass matrix which in turn is indicated by the near maximal atmospheric neutrino mixing and the near zero ${\ensuremath{\theta}}_{13}$. We find that for the case of a normal hierarchy, present data already …