SUSY searches at the Tevatron

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Abstract

The Tevatron collider has provided the CDF and D0 collaborations with large datasets as input to a rich program of physics beyond the standard model. The results presented here are from recent searches for SUSY particles using up to 6 fb-1 of data.

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Model-Independent Jets plus Missing Energy Searches

My-Phuong Le, Johan Alwall, Mariangela Lisanti … (2008)

We present a proposal for performing model-independent jets plus missing energy searches. Currently, these searches are optimized for mSUGRA and are consequently not sensitive to all kinematically-accessible regions of parameter space. We show that the reach of these searches can be broadened by setting limits on the differential cross section as a function of the total visible energy and the missing energy. These measurements only require knowledge of the relevant Standard Model backgrounds and can be subsequently used to limit any theoretical model of new physics. We apply this approach to an example where gluinos are pair-produced and decay to the LSP through a single-step cascade, and show how sensitivity to different gluino masses is altered by the presence of the decay chain. The analysis is closely based upon the current searches done at the Tevatron and our proposal requires only small modifications to the existing techniques. We find that within the MSSM, the gluino can be as light as 125 GeV. The same techniques are applicable to jets and missing energy searches at the Large Hadron Collider.

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Phenomenology of Hidden Valleys at Hadron Colliders

Tao Han, Zongguo Si, Kathryn Zurek … (2007)

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.

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Publication date Created: 03 February 2012

Article

DOI: 10.1051/epjconf/20122809006

ArXiV ID: 1202.0712

SO-VID: e4ef833d-54a1-414e-bb69-81b636885839

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http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Report No LAL-11-374; FERMILAB-CONF-12-028-E

Comments Presented at the 2011 Hadron Collider Physics Symposium (HCP-2011) Paris, France, November 14-18, 2011, 4 pages, 7 figures; Hadron Collider Physics Symposium (HCP-2011), Paris : France (2011)

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