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A comparative study of the S1 and U1 leptoquark effects in the light quark regime

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 consider a scenario when scalar (vector) leptoquark S1 (U1) 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 S1 (U1) 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 S1 (U1) 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.

Leptoquarks ; IceCube

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