arXiv subjects

Kareem Ezzat

Publications and source records attributed to Kareem Ezzat.

3 recordsLinked to original sources

arXiv2026

Z'-Mediated Slepton and Sneutrino Signatures at HL-LHC

We investigate the discovery potential of a heavy $Z'$ boson as a portal to charged sleptons and right-handed sneutrinos within the $B-L$ Supersymmetric Standard Model (BLSSM) at the High-Luminosity LHC. Using a detector-level simulation and Boosted Decision Trees to suppress Standard Model backgrounds, we find that the direct slepton decay $pp \to Z' \to \tilde{\ell}^+\tilde{\ell}^- \to 2\ell + E_{\rm T}^{\rm miss}$ yields a significance exceeding $5σ$ at 3000 fb$^{-1}$, while the cascade $(\mbox{multileptons} + E_{\rm T}^{\rm miss})$ mode is unobservable due to rate suppression. For right-handed sneutrinos, the hadronic channel $pp \to Z' \to \tildeν_R\tildeν_I \to 2\ell + 4j + E{\rm T}^{\rm miss}$ emerges as the most promising signature. These results establish the $2\ell + E_{\rm T}^{\rm miss}$ and $2\ell + 4j + E_{\rm T}^{\rm miss}$ final states as the principal discovery channels for the scalar leptonic sector of the BLSSM at the HL-LHC.

hep-ph↗

arXiv2025

Exploring $Z'$ and Right-Handed Neutrinos in the BLSM at the Large Hadron Collider

We study the collider phenomenology of the $B$-$L$ extension of the Standard Model (BLSM), focusing on the production and decay of a heavy neutral gauge boson ($ Z' $) at the Large Hadron Collider (LHC). In this framework, the $ Z' $ can decay into pairs of heavy right-handed neutrinos ($ ν_R $), which subsequently decay into charged leptons and $ W $ bosons. These processes give rise to three distinctive final states: (i) two leptons plus four jets ($ 2\ell + 4j $), (ii) four leptons plus missing transverse energy ($ 4\ell + \text{MET} $), and (iii) three leptons plus two jets and MET ($ 3\ell + 2j + \text{MET} $). % To enhance signal sensitivity and suppress Standard Model backgrounds, we employ multivariate analysis techniques based on Boosted Decision Trees (BDTs), as well as selection optimizations using the \texttt{XGBOOST} framework. The classifiers are trained on kinematic observables sensitive to the masses of the $ Z' $ and $ ν_R $. We demonstrate that all three final states offer significant discovery potential for both the $ Z' $ and heavy $ ν_R $ at the High-Luminosity LHC. Our results highlight the testability of the BLSM at current and future collider experiments, and provide a promising avenue for probing the origin of neutrino masses and the baryon asymmetry of the Universe.

hep-ph↗

arXiv2024

Higgs Quadruplet Impact on $W$ Mass Shift, Dark Matter, and LHC Signatures

The addition of a Higgs quadruplet to the standard model (SM) of quarks and leptons would shift the $W$ boson mass upward. It could also facilitate the production of dark matter through the conventional thermal freeze-out scenario via Yukawa interaction with the Higgs quadruplet or freeze-in production from the decay of SM Higgs. We investigate the same-sign lepton smoking gun signature of the double-charged scalar component of the Quadruplet Higgs at the LHC.

hep-ph↗