Vector Leptoquarks Could Be Rather Light ?
نویسندگان
چکیده
Some low-energy manifestations of a minimal extension of the Standard Model based on the quark-lepton SU (4) V ⊗ SU (2) L ⊗ G R symmetry of the Pati-Salam type are analysed. Given this symmetry a new type of mixing in the quark-lepton interactions is shown to be required. An additional arbitrariness of the mixing parameters could allow to decrease noticeably the lower bound on the leptoquark mass M X originated from the π and K decays and the µe conversion. The only mixing independent bound emerging from the cosmological limit on the π 0 → ν ¯
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