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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A search for lepton-flavor-violating interactions ep→μX and ep→τX has been performed with the ZEUS detector using the entire HERA I data sample, corresponding to an integrated luminosity of 130 pb^{-1}. The data were taken at center-of-mass energies, s√, of 300 and 318 GeV. No evidence of lepton-flavor violation was found, and constraints were derived on leptoquarks (LQs) that could mediate such interactions. For LQ masses below s√, limits were set on λeq1βℓq−−−√, where λeq1 is the coupling of the LQ to an electron and a first-generation quark q1, and βℓq is the branching ratio of the LQ to the final-state lepton ℓ (μ or τ) and a quark q. For LQ masses much larger than s√, limits were set on the four-fermion interaction term λeqαλℓqβ/M2LQ for LQs that couple to an electron and a quark qα and to a lepton ℓ and a quark qβ, where α and β are quark generation indices. Some of the limits are also applicable to lepton-flavor-violating processes mediated by squarks in R-Parity-violating supersymmetric models. In some cases, especially when a higher-generation quark is involved and for the process ep→τX, the ZEUS limits are the most stringent to date.