2006/11/27 by Guang Bian, Mike Bisset, Nicholas Kersting +3
Mathematics · Physics and Astronomy · #Boson #Electron #Geometry #Higgs boson #High-Energy Particle Collisions Research #Invariant (physics) #Invariant mass #Large Hadron Collider #Lepton #Mathematical physics #Mathematics #Muon #Neutralino #Nuclear physics #Pair production #Parameter space #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-007-0472-7
published as Eur.Phys.J.C53:429-446,2008 · 28 pages (LaTeX), 8 figures (encapsulated postscript)
arxiv created 2006/11/27 · openalex publication_date 2007/12/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
`Wedgebox' plots constructed by plotting the di-electron invariant mass versus the di-muon invariant mass from pp -> e+e- mu+ mu- + missing energy signature LHC events. Data sets of such events are obtained across the MSSM input parameter space in event-generator simulations, including cuts designed to remove SM backgrounds. Their study reveals several general features: (1)Regions in the MSSM input parameter space where a sufficient number of events are expected so as to be able to construct a clear wedgebox plot are delineated. (2)The presence of box shapes on a wedgebox plot either indicates the presence of heavy Higgs bosons decays or restricts the location to a quite small region of low μand M2 values \lsim 200 GeV, a region denoted as the `lower island'. In this region, wedgebox plots can be quite complicated and change in pattern rather quickly as one moves around in the (μ, M2) plane. (3)Direct neutralino pair production from an intermediate Z0* may only produce a wedge-shape since only \widetildeχ20\widetildeχ30 decays can contribute significantly. (4)A double-wedge or wedge-protruding-from-a-box pattern on a wedgebox plot, which results from combining a variety of MSSM production processes, yields three distinct observed endpoints, almost always attributable to \widetildeχ2,3,40 → \widetildeχ10 ℓ+ℓ- decays, which can be utilized to determine a great deal of information about the neutralino and slepton mass spectra and related MSSM input parameters. Wedge and double-wedge patterns are seen in wedgebox plots in another region of higher μand M2 values, denoted as the`upper island.' Here the pattern is simpler and more stable as one moves across the (μ, M2) input parameter space.