A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime
Abstract We study the phenomenology of two leptoquarks, the Standard Model SU(2) singlets $$S_1$$ S1 and $$U_1$$ 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) lep...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-03-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-7754-8 |
| _version_ | 1818613941716123648 |
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| author | Ilja Doršner Svjetlana Fajfer Monalisa Patra |
| author_facet | Ilja Doršner Svjetlana Fajfer Monalisa Patra |
| author_sort | Ilja Doršner |
| collection | DOAJ |
| description | Abstract We study the phenomenology of two leptoquarks, the Standard Model SU(2) singlets $$S_1$$ S1 and $$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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. |
| first_indexed | 2024-12-16T16:10:07Z |
| format | Article |
| id | doaj.art-340f0004d4ed408f971a87a95d650289 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-16T16:10:07Z |
| publishDate | 2020-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-340f0004d4ed408f971a87a95d6502892022-12-21T22:25:14ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-03-0180311410.1140/epjc/s10052-020-7754-8A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regimeIlja Doršner0Svjetlana Fajfer1Monalisa Patra2University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split (FESB)Jožef Stefan InstituteJožef Stefan InstituteAbstract We study the phenomenology of two leptoquarks, the Standard Model SU(2) singlets $$S_1$$ S1 and $$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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 $$S_1$$ S1 ($$U_1$$ 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.http://link.springer.com/article/10.1140/epjc/s10052-020-7754-8 |
| spellingShingle | Ilja Doršner Svjetlana Fajfer Monalisa Patra A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime European Physical Journal C: Particles and Fields |
| title | A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime |
| title_full | A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime |
| title_fullStr | A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime |
| title_full_unstemmed | A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime |
| title_short | A comparative study of the $$S_1$$ S1 and $$U_1$$ U1 leptoquark effects in the light quark regime |
| title_sort | comparative study of the s 1 s1 and u 1 u1 leptoquark effects in the light quark regime |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-7754-8 |
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