Using $bar p p$ and $e^+e^-$ Annihilation Data to Refine Bounds on the Baryon-Number-Violating Dinucleon Decays $nn to e^+e^-$ and $nn to mu^+mu^-$

We use $bar p p$ and $e^+e^-$ annihilation data to further strengthen lower bounds on the partial lifetimes for the baryon-number-violating dinucleon decays $nn to e^+ e^-$ and $nn to mu^+mu^-$.