Abstract
We study in detail the collider signatures of an SU(2)R fermionic quintuplet in the framework of left-right symmetric model in the context of the 13 TeV LHC. Apart from giving a viable dark matter candidate (χ0), this model provides unique collider imprints in the form of same-sign multileptons through the decays of multi-charged components of the quintuplet. In particular, we consider the scenario where the quintuplet carries (B − L) = 4 charge, allowing for the presence of high charge-multiplicity particles with relatively larger mass differences among them compared to (B − L) = 0 or 2. In this paper, we mainly focus on the same-sign n-lepton signatures (nSSL). We show that with an integrated luminosity of 500 fb−1, the mass of the neutral component, {M}_{chi^0} ≤ 480 (800) GeV can be excluded at 95% CL in the 2SSL (3SSL) channel after imposing several selection criteria. We also show that a 5σ discovery is also achievable if {M}_{chi^0} ≤ 390 (750) GeV in the 2SSL (3SSL) channel with 1000 fb−1 integrated luminosity.
Highlights
We study in detail the collider signatures of an SU(2)R fermionic quintuplet in the framework of left-right symmetric model in the context of the 13 TeV LHC
The mass degeneracy among the quintuplet fermions of different charges are lifted at the right-handed symmetry breaking scale resulting in much larger mass splitting among them
We study in detail the collider imprints of the same-sign multilepton final states in the context of the 13 TeV LHC
Summary
The gauge group in left-right symmetric models is extended to SU(3)C ×SU(2)L ×SU(2)R × U(1)B−L. Since we have considered a parameter space with the lowest value of quintuplet dark matter mass of 150 GeV for our collider analysis, this limit needs to be satisfied. For this reason, we choose vR = 13 TeV, which gives MWR = 6.0 TeV and MZR = 7.14 TeV. The quintuplet fermion in this model can have a few different values of (B−L) quantum numbers (0, 2, and 4) but for our study we will only consider the case with (B − L) = 4 This scenario will have highest charge multiplicity particles, gives rise to interesting collider signatures. We are interested in the collider signatures of the quintuplet fermions at the LHC which will be discussed
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