2006/07/28 by Yanou Cui · 1 citation
Physics and Astronomy · #Adjoint representation #Black Holes and Theoretical Physics #Gauge group #Gauge theory #Gluino #Higgs boson #Lie algebra #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Renormalization group #Supersymmetry #Supersymmetry breaking #Theoretical physics #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.74.075010
published as Phys.Rev.D74:075010,2006 · 18 pages, 3 figures; minor corrections, references added
arxiv created 2006/07/28 · openalex publication_date 2006/10/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Matter fields in the minimal supersymmetric standard model are chiral supermultiplets in fundamental (or singlet) representations of the standard model gauge group. In this paper we introduce chiral superfields in the adjoint representation of SU(3)C and study the effective field theory and phenomenology of them. These states are well motivated by intersecting D-brane models in which additional massless adjoint chiral supermultiplets appear generically in the low-energy spectrum. Although it has been pointed out that the existence of these additional fields may make it difficult to obtain asymptotic freedom, we demonstrate that this consideration does not rule out the existence of adjoints. The QCD gauge coupling can be perturbative up to a sufficiently high scale, and therefore a perturbative description for a D-brane model is valid. The full supersymmetric and soft SUSY breaking Lagrangians and the resulting renormalization group equations are given. Phenomenological aspects of the adjoint matter are also studied, including the decay and production processes. The similarity in gauge interaction between the adjoint fermion and gluino facilitates our study on these aspects. It is found that these adjoint multiplets can give detectable signals at colliders and satisfy the constraints from cosmology.