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The neutralino sector of the next-to-minimal supersymmetric Standard Model
Choi, S.Y.,Miller, D.J.,Zerwas, P.M. Elsevier 2005 Nuclear physics, B Vol.711 No.1
<P><B>Abstract</B></P><P>The next-to-minimal supersymmetric Standard Model (NMSSM) includes a Higgs iso-singlet superfield in addition to the two Higgs doublet superfields of the minimal extension. If the Higgs fields remain weakly coupled up to the GUT scale, as naturally motivated by the concept of supersymmetry, the mixing between singlet and doublet fields is small and can be treated perturbatively. The mass spectrum and mixing matrix of the neutralino sector can be analyzed analytically and the structure of this 5-state system is under good theoretical control. We also determine decay modes and production channels in sfermion cascade decays to these particles at the LHC and pair production in <SUP>e+</SUP><SUP>e−</SUP> colliders.</P>
The neutralino sector in the U(1)-extended supersymmetric Standard Model
Choi, S.Y.,Haber, H.E.,Kalinowski, J.,Zerwas, P.M. Elsevier BV * North-Holland 2007 Nuclear Physics, Section B Vol.778 No.1-2
Motivated by grand unified theories and string theories we analyze the general structure of the neutralino sector in the USSM, an extension of the minimal supersymmetric Standard Model that involves a broken extra U(1) gauge symmetry. This supersymmetric U(1)-extended model includes an Abelian gauge superfield and a Higgs singlet superfield in addition to the standard gauge and Higgs superfields of the MSSM. The interactions between the MSSM fields and the new fields are in general weak and the mixing is small, so that the coupling of the two subsystems can be treated perturbatively. As a result, the mass spectrum and mixing matrix in the neutralino sector can be analyzed analytically and the structure of this 6-state system is under good theoretical control. We describe the decay modes of the new states and the impact of this extension on decays of the original MSSM neutralinos, including radiative transitions in cross-over zones. Production channels in cascade decays at the LHC and pair production at e<SUP>+</SUP>e<SUP>-</SUP> colliders are also discussed.
τ polarization in SUSY cascade decays
Choi, S.Y.,Hagiwara, K.,Kim, Y.G.,Mawatari, K.,Zerwas, P.M. North-Holland Pub. Co 2007 Physics letters. Section B Vol.648 No.2-3
τ leptons emitted in cascade decays of supersymmetric particles are polarized. The polarization may be exploited to determine spin and mixing properties of the neutralinos and stau particles involved. The sensitivity of the method is illustrated in comparison with predictions for models of universal extra space dimensions. Details of the analysis including experimental effects such as transverse momentum cuts are presented for τ->π decays, which can readily be generalized to other decay modes.
Physics at the [FORMULA OMISSION] linear collider
Moortgat-Pick, G.,Baer, H.,Battaglia, M.,Belanger, G.,Fujii, K.,Kalinowski, J.,Heinemeyer, S.,Kiyo, Y.,Olive, K.,Simon, F.,Uwer, P.,Wackeroth, D.,Zerwas, P. M.,Arbey, A.,Asano, M.,Bagger, J.,Bechtle, Springer Berlin Heidelberg 2015 European Physical Journal C Vol.75 No.8
<P>A comprehensive review of physics at an [FORMULA OMISSION] linear collider in the energy range of [FORMULA OMISSION] GeV–3 TeV is presented in view of recent and expected LHC results, experiments from low-energy as well as astroparticle physics. The report focusses in particular on Higgs-boson, top-quark and electroweak precision physics, but also discusses several models of beyond the standard model physics such as supersymmetry, little Higgs models and extra gauge bosons. The connection to cosmology has been analysed as well.</P>