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Register a new userSignatures of $tilde{R}_2$ class of Leptoquarks at the upcoming $ep$ colliders
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We explore the signatures of the $tilde{R}_2$ 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. For $tilde{R}_2$ 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 $l^{pm}j$ final state. We also discuss the effect of polarized electron and positron beams on LQ production and in turn on $l^{pm}j$ production. At LHeC, the final state $l^+j$ has very good discovery prospect. We find that, only 100 $text{fb}^{-1}$ of data can probe LQ mass upto 1.2 TeV with $5sigma$ 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 $5sigma$ significance with luminosity $1000,text{fb}^{-1}$ and $500,text{fb}^{-1}$, respectively.
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Production of heavy Majorana neutrino $N_{e}$ predicted by left-right symmetric extension of the Standard Model at future { ormalsize TeV} scale $ep$ colliders have been considered. In order to estimate potential of $ep$ colliders for $N_{e}$ search we consider back-groundless process $e^{-}prightarrow e^{+}X$ which is consequence of Majorana nature of $N_{e}$. It is shown that { ormalsize linac-LHC} and { ormalsize linac-FCC} based $ep$ colliders will cover much wider regions of $N_{e}$ and $W_{R}$ masses than corresponding linear electron-positron colliders.
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We study the potential of the linear collider (LC) with sqrt{s}=0.5 TeV, linac-ring type ep collider (LCxLHC) with sqrt{s}=3.74 TeV and the large hadron collider (LHC) with sqrt{s}=14 TeV to search for excited neutrinos through transition magnetic type couplings with gauge bosons. The excited neutrino signal and corresponding backgrounds are studied in detail to obtain accessible mass limits and couplings for these three types of colliders.
The Inert Doublet Model (IDM) is one of the simplest extensions of the Standard Model (SM), providing a dark matter candidate. It is a two Higgs doublet model with a discrete $Z_2$ symmetry, that prevents the scalars of the second doublet (inert scalars) from coupling to the SM fermions and makes the lightest of them stable. We study a large group of IDM scenarios, which are consistent with current constraints on direct detection, including the most recent bounds from the XENON1T experiment and relic density of dark matter, as well as with all collider and low-energy limits. We propose a set of benchmark points with different kinematic features, that promise detectable signals at future $e^+e^-$ colliders. Two inert scalar pair-production processes are considered, $e^+e^- to H^+H^-$ and $e^+e^- to AH$, followed by decays of $H^pm$ and $A$ into final states which include the lightest and stable neutral scalar dark matter candidate $H$. Significance of the expected observations is studied for different benchmark models and different running scenarios, for centre-of-mass energies up to 3 TeV. Numerical results are presented for the signal signatures with two muons or an electron and a muon in the final state. For high mass scenarios, when the significance is too low for the leptonic signatures, the semi-leptonic signature can be used as the discovery channel.
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