2020/12/31 by Linda M. Carpenter, Taylor Murphy · 9 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Explicit symmetry breaking #Gaugino #Large Hadron Collider #Minimal Supersymmetric Standard Model #Minimal model #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Quantum Chromodynamics and Particle Interactions #Spontaneous symmetry breaking #Symmetry (geometry) #Symmetry breaking #hep-ph
paper · pdf · doi:10.1007/jhep05(2021)079
published in Journal of High Energy Physics 2021(5) (Springer Nature) · 69 pages, 14 figures. Updated to resemble JHEP Version of Record
openalex created_date 2021/01/05 · openalex publication_date 2021/05/11 · arxiv created 2021/05/12 · arxiv updated 2021/05/13 · openalex updated_date 2026/08/05
A bstract In this work we study the collider phenomenology of color-octet scalars ( sgluons ) in supersymmetric models with Dirac gaugino masses that feature an explicitly broken R symmetry ( R - broken models ). We construct such models by augmenting minimal R -symmetric models with a fairly general set of supersymmetric and softly supersymmetry-breaking operators that explicitly break R symmetry. We then compute the rates of all significant two-body decays and highlight new features that appear as a result of R symmetry breaking, including enhancements to extant decay rates, novel tree- and loop-level decays, and improved cross sections of single sgluon production. We demonstrate in some detail how the familiar results from minimal R -symmetric models can be obtained by restoring R symmetry. In parallel to this discussion, we explore constraints on these models from the Large Hadron Collider. We find that, in general, R symmetry breaking quantitatively affects existing limits on color-octet scalars, perhaps closing loopholes for light CP-odd (pseudoscalar) sgluons while opening one for a light CP-even (scalar) particle. Qualitatively, however, we find that — much as for minimal R -symmetric models, despite stark differences in phenomenology — scenarios with broken R symmetry and two sgluons below the TeV scale can be accommodated by existing searches.