6,085 research outputs found
The Higgsino-Singlino World at the Large Hadron Collider
We consider light higgsinos and singlinos in the next-to-minimal
supersymmetric Standard Model at the Large Hadron Collider. We assume that the
singlino is the lightest supersymmetric particle and that the higgsino is the
next-to-lightest supersymmetric particle with the remaining supersymmetric
particles in the multi-TeV range. This scenario, which is motivated by the
flavor and CP issues, provides a phenomenologically viable dark matter
candidate and improved electroweak fit consistent with the measured Higgs mass.
Here, the higgsinos decay into on (off)-shell gauge boson and the singlino. We
consider the leptonic decay modes and the resulting signature is three isolated
leptons and missing transverse energy which is known as the trilepton signal.
We simulate the signal and the Standard Model backgrounds and present the
exclusion region in the higgsino-singlino mass plane at the Large Hadron
Collider at TeV for an integrated luminosity of 300 fb.Comment: 12 pages, overall changes, conclusion unchanged, matches published
versio
Asymptotic Symmetries of Colored Gravity in Three Dimensions
Three-dimensional colored gravity refers to nonabelian isospin extension of
Einstein gravity. We investigate the asymptotic symmetry algebra of the
-colored gravity in (2+1)-dimensional anti-de Sitter spacetime.
Formulated by the Chern-Simons theory with gauge group,
the theory contains graviton, Chern-Simons gauge fields and massless
spin-two multiplets in the adjoint representation, thus extending
diffeomorphism to colored, nonabelian counterpart. We identify the asymptotic
symmetry as Poisson algebra of generators associated with the residual global
symmetries of the nonabelian diffeomorphism set by appropriately chosen
boundary conditions. The resulting asymptotic symmetry algebra is a nonlinear
extension of Virasoro algeba and Kac-Moody
algebra, supplemented by additional generators corresponding to the massless
spin-two adjoint matter fields.Comment: 22 pages, published version in JHE
Model Building and Phenomenology in Supersymmetry
Supersymmetry (SUSY) stabilizes the hierarchy between the electroweak scale and the scale of grand unified theories (GUT) or the Planck scale. The simplest supersymmetric extension of the SM, the minimal supersymmetric SM (MSSM) solves several phenomenological problems, e.~g. the gauge couplings unify and the lightest supersymmetric particle (LSP) is a dark matter candidate. In this thesis, Jarlskog invariants, squark pair production at the LHC and massive neutrinos are discussed in the framework of the MSSM and its extensions. </p
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