Abstract
We suggest a new class of tests for searching for lepton flavor non-universality (LFNU) using ratio observables and based on correlations among the underlying LFNU new physics (NP) effects in several (seemingly independent) di-lepton and single lepton + jet(s) processes. This is demonstrated by studying the effects generated by LFNU 4-Fermi interactions involving 3rd generation quarks. We find that the sensitivity to the scale (Λ) of the LFNU 4-Fermi operators significantly improves when the correlations among the various di-lepton +jets and single-lepton + jets processes are used, reaching Λ∼O(10) TeV at the HL-LHC.
Highlights
We suggest a new class of tests for searching for lepton flavor non-universality (LFNU) using ratio observables and based on correlations among the underlying LFNU new physics (NP) effects in several di-lepton and single lepton + jet(s) processes
We show that an enhanced sensitivity to the scale of the NP can be obtained by combining multiple LFNU tests, based on ratio observables
We demonstrate this for two specific new physics (NP) scenarios, using the so-called Standard Model (SM) Effective Field Theory (SMEFT) framework [23,24,25,26], this approach can be extended to establish a more systematic mapping between the underlying NP dynamics and experimentally realistic observables
Summary
We suggest a new class of tests for searching for lepton flavor non-universality (LFNU) using ratio observables and based on correlations among the underlying LFNU new physics (NP) effects in several (seemingly independent) di-lepton and single lepton + jet(s) processes. We do not consider here Drell-Yan di-lepton production pp → + −, i.e., with no jet activity, which correspond to the LFNU signal test T 000 and which, in our case, are generated by b-quark fusion and are, sub-leading.
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