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- W3213625071 abstract "We investigate the constraints on the leptoquark Yukawa couplings and Higgs-leptoquark quartic couplings for scalar doublet leptoquark $tilde{R}_2$, scalar triplet leptoquark $vec S_3$ and their combination with both three generations and one generation from perturbative unitarity and vacuum stability. Perturbative unitarity of all the dimensionless couplings have been studied via one- and two-loop beta-functions. Introduction of new $SU(2)$ multiplets in terms of these leptoquarks fabricate Landau poles at two-loop level in the gauge coupling $g_2$ at $10^{19.7}$ GeV and $10^{14.4}$ GeV, respectively for $vec S_3$ and $tilde{R}_2+vec S_3$ models with three generations. However, such Landau pole ceases to exist for $tilde{R}_2$ and any of these extensions with both one and two generations till Planck scale. The Higgs-leptoquark quartic couplings acquire severe constraints to protect Planck scale perturbativity, whereas leptoquark Yukawa couplings get some upper bound in order to respect Planck scale stability of Higgs Vacuum. The Higgs quartic coupling at two-loop constraints the leptoquark Yukawa couplings for $tilde{R}_2,vec S_3, ,tilde{R}_2+vec S_3$ with values $lesssim 1.30, 3.90, 1.00$ with three generations. In the effective potential approach, the presence of any of these leptoquarks with any number of generations pushes the metastable vacuum of the Standard Model to the stable region." @default.
- W3213625071 created "2021-11-22" @default.
- W3213625071 creator A5023685987 @default.
- W3213625071 creator A5064137069 @default.
- W3213625071 creator A5090298809 @default.
- W3213625071 date "2021-11-06" @default.
- W3213625071 modified "2023-09-27" @default.
- W3213625071 title "Constraining Scalar Doublet and Triplet Leptoquarks with Vacuum Stability and Perturbativity" @default.
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