By Ignatios Antoniadis, Dumitru Ghilencea
Supersymmetry (SUSY) is a brand new symmetry that relates bosons and fermions, which has robust help at either the mathematical and the actual point. This e-book bargains a entire overview, following the improvement of SUSY from its very early days as much as current. The order of the contributions should still give you the reader with the ancient improvement in addition to the newest theoretical updates and interpretations, and experimental constraints from particle accelerators and darkish subject searches. it's a nice excitement to assemble right here contributions from authors who initiated or have contributed considerably to the advance of this conception over such a lot of years. to offer a balanced viewpoint, the publication additionally encompasses a final contribution that makes an attempt to explain the physics past the normal version within the absence of SUSY.
The contributions to this e-book were formerly released within the eu actual magazine C - debris and Fields.
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Extra resources for Supersymmetry After the Higgs Discovery
This is illustrated in Fig. 9. The other advantage is that m eff can be linked to characteristic SUSY parameters like MSUSY , the mass of the highest colored object, MLSP , the LSP mass, and their mass difference ΔM; see Fig. 5. Typically m eff will m T ≡ 2E Tmiss pTl (1 − cos(Δφ)), where pTl is the transverse momentum of the lepton and Δφ the difference in the azimuthal angle between the lepton and the E Tmiss direction. The m T variable has an end-point for backgrounds containing a single leptonically decaying W boson, while signal events contain additional E Tmiss due to the LSPs, leading to an excess at large m T .
H 1 and h 2 , with M p = −1, couple quarks and leptons to their mirror partners but do not survive in the low-energy spectrum. The four-dimensional theory has the same content as the standard model at lowenergy, but with the two spin-0 doublets h 1 and h 2 making possible the gauge/BE-Higgs unification that is one of the most interesting features of supersymmetric theories. (75) for charged leptons and quarks together with their mirror and spin-0 partners, with √ √ √ m e = h e v1 / 2 , m d = h d v1 / 2 , m u = h u v2 / 2 .
LHC data, trigger and detector/object performance relevant for SUSY searches, are treated in Sect. 1. Commonly used discriminating variables for the design of the signal regions are then discussed in Sect. 2 and methods to estimate the remaining background in these signal regions are described in Sect. 3. Finally, the limit setting tools and SUSY models used for interpretations are briefly reviewed in Sects. 5, respectively. Fig. 5 Typical decay of a colored SUSY particle at LHC. The two cases shown at the bottom of the SUSY spectrum correspond to the two considered LSP types ferent decays are possible depending on the sparticle mass spectrum, generating long decay chains.