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• W1750565581 abstract "We investigate the phenomenology of top squarks at the Large Hadron Collider (LHC) in a supersymmetric model where lepton number is identified with an approximate $U(1)_R$ symmetry in such a way that one of the left chiral sneutrinos can acquire a large vacuum expectation value ($vev$) and can play the role of the down-type Higgs. This $R$-symmetry allows a subset of trilinear $R$-parity violating interactions, which determine the collider phenomenology of this model in a significant way. The gauginos are Dirac particles and gluinos are relatively heavy in this class of models. The model contains a right handed neutrino superfield, which gives a tree level mass to one of the active neutrinos. An order one neutrino Yukawa coupling also helps enhance the Higgs boson mass at the tree level and results in a very light bino-like neutralino ($widetilde chi_2^0$) with mass around a few hundred MeV, which is a carrier of missing (transverse) energy (met). The model can accommodate two rather light top squarks, compatible with the observed mass of the Higgs boson. The lighter top squark (${widetilde t}_1$) can decay into $twidetildechi_2^0$, and thus the signal would be similar to the signal of top quark pair production at the LHC. In addition, fully visible decays such as ${widetilde t}_2 rightarrow b e^+$ can give rise to interesting final states. Such signals at the LHC combined with other features like a heavy gluino could provide a strong evidence for this kind of a model. Our analysis shows that $m_{widetilde t_1}lsim 575~(750)$ GeV and $m_{widetilde t_2}lsim 1.2~(1.4)$ TeV can be probed with 5$sigma$ statistical significance at the 13 TeV LHC with 300~(3000) fb$^{-1}$ of integrated luminosity. Finally, we observe that in the presence of super-light carriers of met, the so-called `stealth' top squark scenario may naturally appear in our model." @default.
• W1750565581 created "2016-06-24" @default.
• W1750565581 creator A5013399564 @default.
• W1750565581 creator A5019472087 @default.
• W1750565581 creator A5074926991 @default.
• W1750565581 creator A5077385535 @default.
• W1750565581 creator A5079505154 @default.
• W1750565581 date "2016-04-05" @default.
• W1750565581 modified "2023-10-16" @default.
• W1750565581 title "Light top squarks in aU(1)Rlepton number model with a right handed neutrino and the LHC" @default.
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