Abstract

We investigate the phenomenology of the MSSM extended by a single R-parity-violating coupling at the unification scale. For all R-parity-violating couplings, we discuss the evolution of the particle spectra through the renormalization group equations and the nature of the lightest supersymmetric particle (LSP) within the CMSSM, as an example of a specific complete supersymmetric model. We use the nature of the LSP to classify the possible signatures. For each possible scenario we present in detail the current LHC bounds on the supersymmetric particle masses, typically obtained using simplified models. From this we determine the present coverage of R-parity-violating models at the LHC. We find several gaps, in particular for a stau-LSP, which is easily obtained in R-parity-violating models. Using the program CheckMATE we recast existing LHC searches to set limits on the parameters of all R-parity-violating CMSSMs. We find that virtually all of them are either more strongly constrained or similarly constrained in comparison to the R-parity-conserving CMSSM, including the bar{U}bar{D}bar{D} models. For each R-parity-violating CMSSM we then give the explicit lower mass bounds on all relevant supersymmetric particles.

Highlights

  • Supersymmetry (SUSY) [1,2,3,4] is a unique extension of the external symmetries of the Standard Model of particle physics (SM) [5,6].1 As a solution to the hierarchy problem [8,9], the supersymmetry-breaking scale should be O(TeV)Requiring supersymmetric invariance of the SM and imposing R-parity conservation yields the minimal supersymmetric SM (MSSM)

  • We investigate the phenomenology of the MSSM extended by a single R-parity-violating coupling at the unification scale

  • For all R-parity-violating couplings, we discuss the evolution of the particle spectra through the renormalization group equations and the nature of the lightest supersymmetric particle (LSP) within the constrained minimal supersymmetric SM (CMSSM), as an example of a specific complete supersymmetric model

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Summary

Introduction

Supersymmetry (SUSY) [1,2,3,4] is a unique extension of the external symmetries of the Standard Model of particle physics (SM) [5,6].1 As a solution to the hierarchy problem [8,9], the supersymmetry-breaking scale should be O(TeV)Requiring supersymmetric invariance of the SM and imposing R-parity conservation yields the minimal supersymmetric SM (MSSM). Supersymmetry (SUSY) [1,2,3,4] is a unique extension of the external symmetries of the Standard Model of particle physics (SM) [5,6].1. As a solution to the hierarchy problem [8,9], the supersymmetry-breaking scale should be O(TeV). Requiring supersymmetric invariance of the SM and imposing R-parity conservation yields the minimal supersymmetric SM (MSSM). Its superpotential is given by WMSSM = ab (Yu )i j Q a i HubUj + (Yd )i j Qia Hdb Dj. +(Ye)i j Lia Hdb Ej − μHda Hub , (1)

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