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Published October 1, 2004 | Published
Journal Article Open

Lepton flavor violation without supersymmetry


We study the lepton flavor-violating (LFV) processes µ-->egamma, µ-->3e, and µ-->e conversion in nuclei in the left-right symmetric model without supersymmetry and perform the first complete computation of the LFV branching ratios B(µ-->f) to leading nontrivial order in the ratio of left- and right-handed symmetry-breaking scales. To this order, B(µ-->egamma) and B(µ-->e) are governed by the same combination of LFV violating couplings, and their ratio is naturally of order unity. We also find B(µ-->3e)/B(µ-->e)~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.

Additional Information

© 2004 The American Physical Society. Received 29 April 2004; published 11 October 2004. We thank M. B. Wise for useful comments provided during the course of carrying out this calculation. This work was supported in part under U.S. Department of Energy contract No. DE-FG03-88ER40397 and NSF Grant No. PHY-0071856.

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