 One-family Dirac-Majorana mass matrix (source code)

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= One-family Dirac-Majorana mass matrix
{title2=$\mathcal M=\begin{pmatrix}M_L&m\\m&M_R\end{pmatrix}$}

In an all-left-handed Weyl <basis> $(\nu_L,\nu_R^c)$, the symmetric <matrix> has left and right Majorana entries $M_L,M_R$ and off-diagonal Dirac entry $m$. Real <eigenvalues> can have signs; physical Majorana <masses> are nonnegative after appropriate field rephasings.

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