2016/02/19 by Mirjam Cvetic, Mirjam Cvetič, Cvetic, Mirjam +4 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.1602.06257
12 pages
arxiv created 2016/02/19 · openalex publication_date 2016/02/19 · arxiv updated 2016/02/22 · openalex created_date 2022/08/30 · openalex updated_date 2026/07/28
We study models with heavy exotics that account for the LHC 750 GeV diphoton excess in light of current vector-like quark bounds. Utilizing only exotics that may appear in three-stack and four-stack D-brane models, we show that a narrow width diphoton excess can be accounted for while evading existing bounds if multiple exotics are added, with vector-like leptons of mass ML\lesssim 375 GeV and vector-like quarks with masses up to ≃ 3 TeV. However, a large width (Γ/M ∼ 0.06), as suggested by the ATLAS data, cannot be easily accommodated in this framework. Renormalization group equations with GUT-scale boundary conditions show that these supersymmetric models are perturbative and stable. Type IIA compactifications on toroidal orbifolds allow for O(10) Yukawa couplings in the ultraviolet.