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The recent NA48/2 improvement on R_K=Gamma(K->e nu_e)/Gamma(K->mu nu_mu)emphasizes the role of K_l2 decays in probing the mu-e universality.Supersymmetric (SUSY) extensions of the Standard Model can exhibit mu-enon-universal contributions. Their origin is twofold: those deriving fromlepton flavor conserving couplings are subdominant with respect to thosearising from lepton flavor violating (LFV) sources. We show that mu-enon-universality in K_l2 is quite effective in constraining relevant regions ofSUSY models with LFV (for instance, supergravities with a see-saw mechanism forneutrino masses). A comparison with analogous bounds coming from tau LFV decaysproves the relevance of the measurement of R_K to probe LFV in SUSY.Comment: v2: 5 pages, 1 figure. Comments and 2 references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Probing new physics through<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>μ</mml:mi><mml:mo>−</mml:mo><mml:mi>e</mml:mi></mml:math>universality in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi><mml:mo>→</mml:mo><mml:mi>ℓ</mml:mi><mml:mi>ν</mml:mi></mml:math>

Probing new physics throughμ−euniversality inK→ℓν