We explore the signatures of theR2 class of leptoquark (LQ) models at the proposed e − p and e + p colliders. We carry out an analysis for the proposed colliders LHeC and FCC-eh with center of mass (c.m.) energy 1.3 TeV and 3.46 TeV, respectively. ForR2 class of LQ models, there are a number of final states that can arise from LQ production and its subsequent decay. In this report we do a detailed cut-based analysis for the l ± j final state. We also discuss the effect of polarized electron and positron beams on LQ production and in turn on l ± j production. At LHeC, the final state l + j has very good discovery prospect. We find that, only 100 fb −1 of data can probe LQ mass upto 1.2 TeV with 5σ significance, even with a generic set of cuts. On the contrary, at FCC-eh, one can probe LQ masses upto 2.2 TeV (for e − beam) and 3 TeV (for e + beam), at more than 5σ significance with luminosity 1000 fb −1 and 500 fb −1 , respectively.
We analyse the signal sensitivity of multi-lepton final states at collider that can arise from doubly and singly charged Higgs decay in a type-II seesaw framework. We assume triplet vev to be very small and degenerate masses for both the charged Higgs states. The leptonic branching ratio of doubly and singly charged Higgs states have a large dependency on the neutrino oscillation parameters, lightest neutrino mass scale, as well as neutrino mass hierarchy.We explore this as well as the relation between the leptonic branching ratios of the singly and doubly charged Higgs states in detail. We evaluate the effect of these uncertainties on the production cross-section. Finally, we present a detailed analysis of multi-lepton final states for a future hadron collider HE-LHC, that can operate with center of mass energy √ s = 27 TeV.
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