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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:mrow></mml:math> violation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>B</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math> decays mediated by two nearly-degenerate Majorana neutrinos
We study the $CP$ violation in the lepton-number-violating process ${B}_{s}^{0}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and its $CP$-conjugate process $\overline{{B}_{s}^{0}}\ensuremath{\rightarrow}{D}_{s}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ that are induced by two GeV-scale Majorana neutrinos with nearly-degenerate masses. Our result shows that the size of the $CP$ violation could become considerable if the mass difference between the two Majorana neutrinos is around …