Color-octet scalars in Dirac gaugino models with broken symmetry
arXiv:2012.15771 · doi:10.1007/JHEP05(2021)079
Abstract
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 symmetry (-broken models). We construct such models by augmenting minimal -symmetric models with a fairly general set of supersymmetric and softly supersymmetry-breaking operators that explicitly break symmetry. We then compute the rates of all significant two-body decays and highlight new features that appear as a result of 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 -symmetric models can be obtained by restoring symmetry. In parallel to this discussion, we explore constraints on these models from the Large Hadron Collider. We find that, in general, 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 -symmetric models, despite stark differences in phenomenology -- scenarios with broken symmetry and two sgluons below the TeV scale can be accommodated by existing searches.
arXiv comment69 pages, 14 figures. Updated to resemble JHEP Version of Record
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