2008/01/24 by Vernon Barger, V. Barger, Yu Gao +4
Physics and Astronomy · #Black Holes and Theoretical Physics #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #hep-ex #hep-ph #hep-th
paper · pdf · doi:10.1016/j.physletb.2008.02.026
published as Phys.Lett.B661:276-286,2008 · 19 pages, 8 figures, 2 tables
arxiv created 2008/01/24 · openalex publication_date 2008/02/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
If scale invariance is exact, unparticles are unlikely to be probed in colliders since there are stringent constraints from astrophysics and cosmology. However these constraints are inapplicable if scale invariance is broken at a scale μ≳1 GeV. The case 1 GeV≲μ<MZ is particularly interesting since it allows unparticles to be probed at and below the Z pole. We show that μ can naturally be in this range if only vector unparticles exist, and briefly remark on implications for Higgs phenomenology. We then obtain constraints on unparticle parameters from e+e−→μ+μ− cross-section and forward–backward asymmetry data, and compare with the constraints from mono-photon production and the Z hadronic width.