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Searches for New Physics With Leptons at the Tevatron

Searches for New Physics With Leptons at the Tevatron. Jonathan Hays Imperial College London On behalf of the CDF and D0 Collaborations. Overview. Neutralinos and Charginos Stops New resonances W ’ , Z ’ , and Gravitons Heavy or composite fermions.

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Searches for New Physics With Leptons at the Tevatron

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  1. Searches for New PhysicsWith Leptons at the Tevatron Jonathan Hays Imperial College London On behalf of the CDF and D0 Collaborations

  2. Overview • Neutralinos and Charginos • Stops • New resonances • W’, Z’, and Gravitons • Heavy or composite fermions Leptons – clear signatures at hadron colliders -> triggers and event selection

  3. Neutralinos and Charginos Direct EWK production – jet free SUSY – squarks and gluinos typically heavy Barger et al., hep-ph/0003154 Spectacular 3 lepton signature Low cross section Leptons can be soft “Golden signature”

  4. Trileptons PLB 680, 24 (2009) Final states with 3 leptons eel, l, el, l/ Optimised for 2 mSUGRA reference models

  5. Trileptons Similar analysis at CDF PRL101:251801,2008 CDF-Note 9817 Classify events according to lepton quality

  6. Trileptons No significant excesses observed Interpret results in mSUGRA

  7. Stop Searches Stop potentially lighter than top arXiv:0912.1308 Assume chargino light neutralino LSP Look for stop mimicking top production    tb±1b01l± D0-Note 5937 • Assume chargino heavy • sneutrino LSP • eµ+(bb)+MET signature l+l-+jets>1 +MET signature With and without b-tags

  8. Stop Searches 128 < mstop < 135 Excluded at 95%CL

  9. Stop Searches Set limits using 2D bins ST (leptons + MET) vs HT (jets)

  10. RS Gravitons Warped extra dimensions Predicts KK-gravitons Lightest M1 ~ TeV avoids fine-tuning D0 Preliminary D0 Preliminary e+e- and  final states Dominant backgrounds Drell Yan and SM 

  11. RS Gravitons No significant excess observed D0 Preliminary D0 Preliminary M1 > 440  1040 GeV k/MPl 0.01  0.1

  12. Diboson Resonances Search in WW and WZ final states e + MET + 2(3) jets Optimise ET cuts for G, W’, Z’ CDF-Note 9730

  13. Diboson Resonances W’ decaying into WZ Predicted in many theories 3 leptons + MET No evidence of resonant WZ production Exclude 188 < MW’ < 520 (SSM) 208 < MT < 408 (LSTC) PRL 104, 061801 (2010) 

  14. Heavy Fermions Search for 4th gen b’ or composite B and T5/3 l±l±+bj+MET ± QtW, tbW+ Data: 2 events, Bgd: 1.6 ± 1.4 Mb’,MB > 338 GeV MT5/3 > 365 GeV arXiv:0912.1057 Submitted to PRL

  15. Just a sampling of NP Searches at Tevatron LHC era approaches rapidly! However – Tevatron still has work to do Potential for discovery still there

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