https://doi.org/10.1140/epjc/s10052-020-7754-8
Regular Article - Theoretical Physics
A comparative study of the 
and 
leptoquark effects in the light quark regime
1
University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split (FESB), Ruđera Boškovića 32, 21000, Split, Croatia
2
Jožef Stefan Institute, Jamova 39, P.O. Box 3000, 1001, Ljubljana, Slovenia
3
Department of Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia
* e-mail: monalisa.patra26@gmail.com
Received:
17
December
2019
Accepted:
19
February
2020
Published online:
4
March
2020
We study the phenomenology of two leptoquarks, the Standard Model SU(2) singlets and , 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 () 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 () 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 () 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.
© The Author(s), 2020
