Scalar Neutrinos at the LHC

Abstract

We study a softly-broken supersymmetric model whose gauge symmetry is that of the standard model (SM) gauge group times an extra Abelian symmetry U(1)'. We call this gauge-extended model U(1)' model, and we study a U(1)' model with a secluded sector such that neutrinos acquire Dirac masses via higher-dimensional terms allowed by the U(1)' invariance. In this model the mu term of the minimal supersymmetric model (MSSM) is dynamically induced by the vacuum expectation value of a singlet scalar. In addition, the model contains exotic particles necessary for anomaly cancellation, and extra singlet bosons for achieving correct Z'/Z mass hierarchy. The neutrinos are charged under U(1)', and thus, their production and decay channels differ from those in the MSSM in strength and topology. We implement the model into standard packages and perform a detailed analysis of sneutrino production and decay at the Large Hadron Collider, for various mass scenarios, concentrating on three types of signals: (1) 0lep+ MET,(2) 2lep+MET, and (3) 4lep + MET. We compare the results with those of the MSSM whenever possible, and analyze the SM background for each signal. The sneutrino production and decays provide clear signatures enabling distinction of the U(1)' model from the MSSM at the LHC.

42 pages, 6 tables, 11 figures

References in corpus (7)

• PYTHIA 6.4 Physics and Manual
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Indirect search for dark matter with micrOMEGAs2.4
• \sqrt{s}_min: a global inclusive variable for determining the mass scale of new physics in events with missing energy at hadron colliders
• Measuring Z' couplings at the LHC
• U(1)' solution to the mu-problem and the proton decay problem in supersymmetry without R-parity
• Search for Gauge Extensions of the MSSM at the LHC

Cited by in corpus (11)

• Neutrino Masses from the Top Down
• Neutralino and Chargino Production in U(1)' at the LHC
• Higgs Bosons in supersymmetric U(1)' models with CP Violation
• $E_6$ Motivated UMSSM Confronts Experimental Data
• Charged Higgs in MSSM and Beyond
• Sterile neutrinos in U(1)' with R-parity Violation
• Leptophobic $Z^{\prime }$ bosons in the secluded UMSSM
• Model Characterization and Dark Matter in the Secluded $U(1{)}^{\prime }$ Model
• Heavy $Z^{\prime }$ Bosons in the Secluded $U(1{)}^{\prime }$ Model at Hadron Colliders
• Family Non-Universal U(1)${}^{\prime }$ Model with Minimal Number of Exotics
• Identifying Sneutrino Dark Matter: Interplay between the LHC and Direct Search