Bounds on Scalar Leptoquarks from Z Physics

Abstract

We analyse the constraints on scalar leptoquarks coming from radiative corrections to $Z$ physics. We perform a global fitting to the LEP data including the contributions of the most general effective Lagrangian for scalar leptoquarks, which exhibits the $SU(2{)}_L\times U(1{)}_Y$ gauge invariance. We show that the bounds on leptoquarks that couple to the top quark are much stronger than the ones obtained from low energy experiments.

RevTeX 3.0, 26 pages, 4 postscript figures included as uufile

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Cited by in corpus (27)

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• Constraints on two-lepton, two quark operators
• A nonsupersymmetric resolution of the anomalous muon magnetic moment
• Lepton Mass Matrix Models
• Minimal Flavour Violation for Leptoquarks
• Bounds on second generation scalar leptoquarks from the anomalous magnetic moment of the muon
• Inclusive nonresonant multilepton probes of new phenomena at $\sqrt{s}=$ 13 TeV
• CP Violation Beyond the Standard Model and Tau Pair Production in $e^{+}{e}^{-}$ Collisions
• Indirect and monojet constraints on scalar leptoquarks
• S, T, and Leptoquarks at HERA
• On the Minimal Flavor Violating Leptoquark Explanation of the $R_{D^{(\ast )}}$ Anomaly
• New interactions in neutrino oscillations with three light flavors
• Transverse beam polarization and limits on leptoquark couplings in e+e- --> t tbar
• Static weak dipole moments of the $\tau$ lepton via renormalizable scalar leptoquark interactions
• Leptoquarks decaying to a top quark and a charged lepton at hadron colliders
• Of Contact Interactions and Colliders
• Dipole moments of tau as a sensitive probe for beyond standard model physics
• CP-violating dipole form factors of the top quark and tau lepton in scalar leptoquark models
• Flavor changing neutral current decays $t\to cX$ ($X=\gamma ,g,Z,H$) and $t\to c\bar{\ell }\ell$ ($\ell =\mu ,\tau$) via scalar leptoquarks
• Enhancement of the double Higgs production via leptoquarks at the LHC
• Z Physics Constraints on Vector Leptoquarks
• Effects of lepton number violating interactions on $t\bar{t}$ production at NLC
• Constraining R-parity-violating couplings in $\tau$-processes at the LHC and in electroweak precision measurements
• Rare decay $t\to c\gamma \gamma$ via scalar leptoquark doublets