Phenomenology of hidden valleys at hadron colliders

By T. Han, Zong-Guo Si, K. Zurek, M. Strassler. 2007

261 citations recorded by the source corpus.

We study the phenomenology of, and search techniques for, a class of ``Hidden Valleys. These models are characterized by low mass (well below a TeV) bound states resulting from a confining gauge interaction in a hidden sector; the states include a spin-one resonance that can decay to lepton pairs. Assuming that the hidden sector communicates to the Standard Model (SM) through TeV suppressed operators, taking into account the constraint from the Z pole physics at LEP, searches at Tevatron may be difficult in the particular class of Hidden Valleys we consider, so that we concentrate on the searches at the LHC. Hidden Valley events are characterized by high multiplicities of jets and leptons in the final state. Depending on the scale of confinement in the hidden sector, the events are typically more spherical, with lower thrust and higher incidences of isolated leptons, than those from the SM background processes. Most notably, high cluster invariant mass and very narrow, low mass resonances in lepton pairs are the key observables to identify the signal. We use these characteristics to develop a set of cuts to separate the Hidden Valley from SM, and show that with these cuts LHC has a significant reach in the parameter space. Our strategies are quite general and should apply well beyond the particular class of models studied here.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/dc59ac6b80a231e64693f0bffecffdc270e938be

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Citations in the corpus

Phenomenology of event shapes at hadron colliders (2010, methodology): “For example, the ATLAS [69] and CMS [70] discussions of prospective analyses mention the use of event shapes, most notably the transverse sphericity (see below), in physics studies that range from tt̄ analyses to searches for supersymmetric particle decays and black-hole decays (yet other applicatio”
Expression of interest for the CODEX-b detector (2019, background): “The phenomenology of hidden valleys can vary widely [111, 129, 160–164], both in terms of the energy and angular distributions of the final states, as well as the lifetime of the dark sector particles.”
Probing dark forces and light hidden sectors at low-energy e+e- colliders (2009, background): “The discussion of Section 3 is similar in spirit to the hadron collider phenomenology for Hidden Valleys [18, 19, 20, 21] and the Higgsed dark-sector models discussed in [8, 22, 23] (see also [24]).”
Higgs Physics at the HL-LHC and HE-LHC (2019, methodology): “A simple example motivated by Twin Higgs constructions [812] and Hidden Valley models [960, 961]) is”
Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, methodology): “1 fb 1 in the wino LSP scenario [62] is shown as well.”
Vectorlike confinement at the LHC (2009, background): “Another closely related class of models is the “Hidden Valley” scenario [7].”
Abelian hidden sectors at a GeV (2009, background): “Note, however, that the non-Abelian models considered in [8, 98] have characteristically busy events due to showering in the hidden sector and the final-state leptons will tend to be somewhat soft.”
Non-abelian dark sectors and their collider signatures (2009, unknown): “Their collider phenomenology was investigated in [41, 42].”