Abstract
We study the phenomenology of two leptoquarks, the Standard Model SU(2) singlets S_1 and U_1, with regard to the latest experimental data from the low-energy flavor physics measurements, LHC, and the IceCube neutrino experiment. We consider a scenario when scalar (vector) leptoquark S_1 (U_1) couples exclusively to the down quark and the neutrinos (charged leptons) of all flavors, where the leptoquark in question couples to the SM lepton doublets. The couplings of S_1 (U_1) to the up-type quarks and the charged leptons (neutrinos) are in turn uniquely determined via SU(2) symmetry. We find that the most important constraints on the leptoquark parameter space originate from flavor physics measurements, followed by the LHC search limits that take over the flavor physics ones in the large LQ mass regime. We furthermore show that S_1 (U_1) marginally improves (spoils) the fit of the current IceCube data with respect to the SM case within the region of parameter space that is otherwise consistent with various low-energy flavor physics measurements and the latest LHC input. Our study offers an up-to-date analysis for these two leptoquarks in view of the latest experimental data.
Highlights
Grand Unified Theories based on Pati–Salam model [2,3], SU (5) [4], S O(10) [5,6], supersymmetry with R-parity violation [7], and composite models [8,9]
We study the phenomenology of two leptoquarks, the Standard Model SU (2) singlets S1 and U1, with regard to the latest experimental data from the low-energy flavor physics measurements, LHC, and the IceCube neutrino experiment
We find that the most important constraints on the leptoquark parameter space originate from flavor physics measurements, followed by the LHC search limits that take over the flavor physics ones in the large LQ mass regime
Summary
Grand Unified Theories based on Pati–Salam model [2,3], SU (5) [4], S O(10) [5,6], supersymmetry with R-parity violation [7], and composite models [8,9]. In this manuscript, in the scenarios when LQs primarily couple to the quarks of the first generation and neutrinos of all flavors and investigate the viability of the associated parameter space spanned by the LQ masses and coupling strengths in view of the latest experimental data from flavor physics, LHC, and the South Pole situated IceCube detector. 5. The combined analysis using the lowenergy flavor observables, along with the LHC results and the latest IceCube data, for both S1 and U1, is presented in Sect.
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