Heavy-Neutrino Chirality Enhancement of the Decay $K_L->e\mu$ in Left-Right Symmetric Models

Abstract

We study the decay $K_L->e\mu$ in minimal extensions of the Standard Model based on the gauge groups $SU(2{)}_{L}xU(1{)}_Y$ and $SU(2{)}_{R}xSU(2{)}_{L}xU(1{)}_{B-L}$, in which heavy Majorana neutrinos are present. In $SU(2{)}_{L}xU(1{)}_Y$ models with chiral neutral singlets, $B(K_L->e\mu )$ cannot be much larger than $5x10^{-15}$ without violating other low-energy constraints. In $SU(2{)}_{L}xSU(2{)}_{R}xU(1{)}_{B-L}$ models, we find that heavy-neutrino-chirality enhancements due to the presence of left-handed and right- handed currents can give rise to a branching ratio close to the present experimental limit $B(K_L->e\mu )<3.3x10^{-11}$.

16 pages (4 figs appended as a ps file), LaTeX, RAL/94-090 and MZ-TH/94-22

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Cited by in corpus (5)

• Rare Charm Decays in the Standard Model and Beyond
• Gauge-Independent Analysis of K_L --> e μin Left-Right Models
• Lepton flavor violating tau and B decays and heavy neutrinos
• Low scale Seesaw model and Lepton Flavor Violating Rare B Decays
• Fermion masses and mixings and charged lepton flavor violation in a 3-3-1 model with inverse seesaw