Abstract
We provide five benchmark hidden valley models with perturbative parton showers, which span a wide range of dark shower phenomenology. We consider production through an $s$-channel, heavy mediator, which can be identified with the SM Higgs. By assuming a set of well-motivated decay portals, one can moreover fix both the branching ratios of the dark mesons and set a lower bound on their lifetime. We provide a public python tool which can be used to generate self-consistent pythia 8 cards for our benchmark models.
Highlights
The possible collider signatures of confining dark sectors were first considered in the context of hidden valley models [1], where it was noted that the resulting spectacular phenomenologies could prove to be well-motivated “stress tests” for the existing analysis strategies at the LHC
The dark sector phenomenology of these models is similar to the simplified model we present here, in the sense that hadronization will produce a mixture of invisible and visible dark mesons, giving rise to a semivisible jet
We present a set of five benchmark hidden valley models featuring a perturbative parton shower, which we believe constitute a good basis for a systematic experimental exploration of this space of models
Summary
The possible collider signatures of confining dark sectors were first considered in the context of hidden valley models [1], where it was noted that the resulting spectacular phenomenologies could prove to be well-motivated “stress tests” for the existing analysis strategies at the LHC. There exist a good number of interesting examples of hidden valley models that produce a variety of dark shower topologies, as referenced above These various examples may be singular points in the viable model space, and it is not yet clear how representative their phenomenology is in the vast space of possibilities. Point (iii) in particular calls for an unbiased “simplified models” strategy, where toy models are constructed that capture the main phenomenological features and can be recast most with minimal reference to theoretical priors. This approach was applied with great success in the context of supersymmetry [55] and dark matter searches [56].
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