English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the phenomenology of top squarks at the Large Hadron Collider(LHC) in a supersymmetric model where lepton number is identified with anapproximate $U(1)_R$ symmetry in such a way that one of the left chiralsneutrinos can acquire a large vacuum expectation value ($vev$) and can playthe role of the down-type Higgs. This $R$-symmetry allows a subset of trilinear$R$-parity violating interactions, which determine the collider phenomenologyof this model in a significant way. The gauginos are Dirac particles andgluinos are relatively heavy in this class of models. The model contains aright handed neutrino superfield, which gives a tree level mass to one of theactive neutrinos. An order one neutrino Yukawa coupling also helps enhance theHiggs boson mass at the tree level and results in a very light bino-likeneutralino ($\widetilde \chi_2^0$) with mass around a few hundred MeV, which isa carrier of missing (transverse) energy (\met). The model can accommodate tworather light top squarks, compatible with the observed mass of the Higgs boson.The lighter top squark (${\widetilde t}_1$) can decay into$t\widetilde\chi_2^0$, and thus the signal would be similar to the signal oftop 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 couldprovide 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 LHCwith 300~(3000) fb$^{-1}$ of integrated luminosity. Finally, we observe that inthe presence of super-light carriers of \met, the so-called `stealth' topsquark scenario may naturally appear in our model.

Light top squarks in $U(1)_{R}$-lepton number model with a right handed neutrino and the LHC