Vector Leptoquarks Could Be Rather Light?

Abstract

Some low-energy manifestations of a minimal extension of the Standard Model based on the quark-lepton $SU(4{)}_V\otimes SU(2{)}_L\otimes G_R$ 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 $\pi$ and $K$ decays and the $\mu e$ conversion. The only mixing independent bound emerging from the cosmological limit on the ${\pi }^0\to \nu \bar{\nu }$ decay width is $M_X>18TeV$.

10 pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-94/02

Cited by in corpus (24)

• Physics of leptoquarks in precision experiments and at particle colliders
• The Physics of the B Factories
• Quark-Lepton Unification and Rare Meson Decays
• The Minimal Quark-Lepton Symmetry Model and the Limit on Z'-mass
• Mass limits for scalar and gauge leptoquarks from $K_L^0\to e^{\mp }{\mu }^{\pm },B^0\to e^{\mp }{\tau }^{\pm }$ decays
• Vector leptoquark mass limits and branching ratios of $K_L^0,B^0,B_s\to l_i^{+}{l}_j^{-}$ decays with account of fermion mixing in leptoquark currents
• SO(10) paths to dark matter
• Search for B^0 -> l^+ l^- at Belle
• The third type of fermion mixing in the lepton and quark interactions with leptoquarks
• Extra $Z^{\prime }$s and $W^{\prime }$s in Heterotic--String Derived Models
• Search for Decays of B^{0} Mesons into Pairs of Leptons: B{0} -> e^{+}e^{-}, B^{0} -> μ^{+}μ^{-} and B^{0} -> e^{\pm}μ^{\mp}
• An alternative SU(4) x SU(2)L x SU(2)R model
• Implications of TeV scale SU(4)xSU(2)_LxSU(2)_R quark-lepton unification
• The LHC di-photon excess and Gauge Coupling Unification in Extra $Z^{\prime }$ Heterotic-String Derived Models
• Lowering the scale of Pati-Salam breaking through seesaw mixing
• Pati-Salam Axion
• All possible first signals of gauge leptoquark in quark-lepton unification and beyond
• Muon decays with lepton--number violation via vector leptoquark
• Chiral gauge leptoquark mass limits and branching ratios of $K_L^0,B^0,B_s\to l_i^{+}{l}_j^{-}$ decays with account of the general fermion mixing in leptoquark currents
• Dimension-5 baryon-number violation in low-scale Pati-Salam
• Radiatively Generated Fermion Masses In $SU(4)\times SU(2{)}_L\times SU(2{)}_R$
• Solutions of the atmospheric, solar and LSND neutrino anomalies from TeV scale quark-lepton unification
• Neutrino Radiative Decay in an External Electromagnetic Field via Vector Leptoquark
• Rare decay $t\to c\gamma \gamma$ via scalar leptoquark doublets