Top quark jets as a probe of the constrained minimal supersymmetric standard model with a degenerate top squark and lightest supersymmetric particle.

The degenerate top squark next-to-lightest supersymmetric particle (NLSP) and neutralino (LSP) scenario is well motivated but hard to detect in the collider experiments. We propose a novel signature for detection of this scenario at the Large Hadron Collider and demonstrate its feasibility. In the constrained minimal supersymmetric standard model and top squark NLSP, gluinos are in general much heavier than the lighter top squark and, thus, it decays dominantly to high transverse momentum (p(T)) top-quark-top-squark pairs. We consider gluino pair production and study two high-p(T) top jets and missing energy as the signature of this scenario.

Signatures for right-handed neutrinos at the large hadron collider.

We explore possible signatures for right-handed neutrinos in a TeV scale B-L extension of the standard model at the Large Hadron Collider. The studied four lepton signal has a tiny standard model background. We find the signal experimentally accessible at the LHC for the considered parameter regions.