Lepton flavor violation without supersymmetry

We study the lepton flavor-violating (LFV) processes $\mu \to e\gamma$, $\mu \to 3e$, and $\mu \to e$ conversion in nuclei in the left-right symmetric model without supersymmetry and perform the first complete computation of the LFV branching ratios $B(\mu \to f)$ to leading nontrivial order in the ratio of left- and right-handed symmetry-breaking scales. To this order, $B(\mu \to e\gamma )$ and $B(\mu \to e)$ are governed by the same combination of LFV violating couplings, and their ratio is naturally of order unity. We also find $B(\mu \to 3e)/B(\mu \to e)\sim 100$ under slightly stronger assumptions. Existing limits on the branching ratios already substantially constrain mass splittings and/or mixings in the heavy neutrino sector. When combined with future collider studies and precision electroweak measurements, improved limits on LFV processes will test the viability of low-scale, nonsupersymmetric LFV scenarios.