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Exploring New Physics at the Tevatron: Supersymmetry, Extra Dimensions, and More

Join Pedro Mercadante on a quest to uncover new physics at the Tevatron, discussing the TeV scale, Supersymmetry, Extra Dimensions, and models beyond the Standard Model. Explore results from past Tevatron runs and delve into innovative detector technologies alongside integrated luminosity assessments, offering insight into various SUSY scenarios and latest experimental limits.

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Exploring New Physics at the Tevatron: Supersymmetry, Extra Dimensions, and More

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  1. Search for new physics at the Tevatron Pedro Mercadante IFT/UNESP OnbehalfofDZeroand CDF collaborations Pedro Mercadante

  2. TevEnergyScale • Why is the TeV scale special? • It is the scale of EW symmetry breaking • We don´t know how masses are generated • In the Standard Model the Higgs mechanism is evoked (Barbara´s talk) • New Physics Beyond Standard Model? • Supersymmetry • Extra Dimensions • Other models Pedro Mercadante

  3. Past and Future Accelerators Pedro Mercadante

  4. Tevatron Run IIStill at the Energy Frontier Chicago  DØ CDF p Tevatron p Antiproton Injector Recycler • Accelerator • pp • 1.96 TeV • L = 4-5 fb-1 to be analyzed. In this talk 1-3 fb-1 results will be presented • Detectors • Good coverage • Good particle identification Pedro Mercadante

  5. Detectors DZero Detector CDF Detector Pedro Mercadante

  6. Integrated Luminosity 3 fb-1 Aug 2007 Pedro Mercadante

  7. Supersymmetry The MSSM Minimalsupersymmetricmodel Two Higgs doublet SM + Superpartners µ parameter tan  Superpotential Soft Terms Scalar Masses (m0) GauginosMasses (m1/2) Trilinear(A) Parameter Bilinear (B)Parameter Pedro Mercadante

  8. SupersymmetryWhich SUSY? • mSUGRA (Constrained MSSM) m0, m1/2, tan , A, sign μ • gluino + squark • gluino + sbotton • trilepton • AMSB and GMSB • R parityViolationModels Pedro Mercadante

  9. mSugragluinos (jet + missing ET)cdfarXiv:0811.2512 PLB 660,449 • General search: gluino + squarksproduction • Jets + missingET • MissingET • 2,3,4 Jets; pT > 25 GeV • Angles • Lepton veto Pedro Mercadante

  10. Results • Resultsonsquarkandgluinomass. • For squarkmass = gluinomass-> m > 392 GeV • Results in the plane m0 X m1/2 • DZerohas similar limits Pedro Mercadante

  11. mSugragluinos (b-jet + missing ET)http://www-cdf.fnal.gov/physics/exotic/r2a/20080821.bbmet_gluinosbottom/ • Gluino -> Sbottons • Jets + missing ET • 2 jets • 1 b tag • 2 b tag Pedro Mercadante

  12. mSugraCharginos(trileptons)D0 arXiv:0901.0646 • Cuts: • Two set ofpTcut • Invariantmass, angular cut • Transversemass, missing ET , jet veto • TrackpT • Invariantmassl-track • TrileptonSignal: Cleansignal • Modeldependent • 4 channelspTl > 12, 8 GeV • e,e, l • e,μ,l • μ, μ,l • μ ,τ, l • In allchannelsthe extra lepton is a track Pedro Mercadante

  13. mSugraCharginos(trileptons) Limits for σ X BR Best limitsonthecontextofmSugra Similar search from CDF publishedwith 2 fb-1 http://www-cdf.fnal.gov/physics/exotic/r2a/20080110.trilepton_dube/ Pedro Mercadante

  14. Extra DimensionsAre therenew extra Dimension? • Large Extra Dimensions (ADD models) • Onlygravitypropagates in the extra dimensions • Directsignal: missing ET fromthesumof KK states propagating in thebulk • Indirectsignal: sumof KK towersmodifytheproductionof SM particles • Universal Extra Dimensions • Allparticlescanpropagate in the extra dimensions. Allparticlehavenewexcited states • Signals are similar to thoseof SUSY • RandallSundrummodels • Excited states ofgravitons are heavy. Mightbeproducedanddecay in pairsof SM particles Pedro Mercadante

  15. Large Extra DimensionsDirectsignal: photon + missing ETD0 PRL 101, 011601 • Selection • pT> 90 GeV, missing ET > 70 GeV • Background • NonCollision • Miss identifiedjet • Z + gamma • No jets (pT > 15 GeV), no Leptons (muons, trackswithpT> 8 GeV) 51 Data Events 49.9 expected Pedro Mercadante

  16. Limits Limits are set dependingonthenumberof extra dimension For n=2,3,4 M > 970, 899, 867 GeV CDF has similar results(PRL 101, 181602) Pedro Mercadante

  17. LED Virtual Gravitonexchange: Diphotonsanddielectrons D0 arXiv:0809.2813 • Sensitive to thecutoff • Selection: • Eletromagnetic (EM) cluster with PT > 15 GeV • Central andendcap cluster (CC-EC) • Background • Drell Yan andγγproduction • Multijet Pedro Mercadante

  18. Randall-SundrumZZ resonance http://www-cdf.fnal.gov/~boveia/blessing/public/public.html • G -> ZZ • eeμμ • μμ μμ • eeee • eejj • Looserequirement for e andmuons • Trigger e orμ: pT > 20 GeV • Relaxedlepton (e, μ) + 2 jets (pT > 10 GeV) or 2 relaxedlepton • Estimatethebgfromsidebands Pedro Mercadante

  19. Results • Modelindependentresults for Mx > 300 GeV • In theRandallSundrum framework leads to M > 491 GeV (k/Mpl = 0.1) Pedro Mercadante

  20. Di Muon(RandallSundrum) CDF arXiv:0811.0053 • 2 Muonchannel • Selection • 2 muons • pt > 30 GeV • eta < 1 • Bg • Drell Yan • Results • Spin2 (RS) mass > 921 GeV (k/Mpl = 0.1) • Spin 1 (Z´) mass > 1030 GeV • Spin 0 (sneutrino) mass > 810 GeV (λ*BR=0.01) Pedro Mercadante

  21. Di Electrons(RandallSundrum) http://www-cdf.fnal.gov/physics/exotic/r2a/20080306.dielectron_duke/pub25/duke.html • Selection • 2 electrons • pT> 25 GeV • eta < 2 • Bg • Drell Yan • Results • Spin 2 (RS) mass > 850 GeV (k/Mpl = 0.1) • Spin 1 (Z´) mass > 955 GeV • Similar studyfromDZero • RS Gravitonmass > 900 GeV (k/Mpl = 0.1) • 1 .1 fb-1, ee+γγsignal PRL 100, 091802 Pedro Mercadante

  22. Leptoquarks(lepton + quark signal) • Leptoquarkscarriesbothcolor charge andleptonnumber • Are present in severalmodels • Compositness, GUT, Superstring • Provides a clear signature • l+ jets • From FCNC suppression l+q shouldbeofsamegeneration Pedro Mercadante

  23. ThirdGeneration LQ D0 arXiv:0806.3527 • LQ -> tau b • 2 b jets, 2 taus • Preselection • 2 jets, pT> 20 GeV, eta < 2.5 • 1 muon, pT > 15, eta < 2 • 1 hadronictau (dependondecaymode) • 1 pT >15 GeV • pT >15 GeV • pT > 20 GeV > 2 tracks • Background • Multijets • top pairproduction • W/Z + jets • Diboson Pedro Mercadante

  24. Results NN for tauidentification NN for b identification Leptoquarkmass > 210 GeV Pedro Mercadante

  25. AcoplanarTopologyLeptoquarksandT-odd quarks D0 arXiv:0806.3527 • Jets + Missing ET • ET > 75 GeV • pT1, pT2 > 35 GeV • Angles • J1, ET > 90o • J, ET > 50o • J, ET < 150o • Lepton Veto • Backgrounds • W/Z + jets • Ttpair • WZ pair • Results • Optimization in ETand HT • LQ mass > 205 GeV • T-odd quark mass > 400 GeV Pedro Mercadante

  26. Conclusions • TheTevatron is ourbest machine atthepresent • Atthepresent no evidence for newphenomena is observed (data for 2-3 fb-1 ) • The data is beingwellunderstood • New data is beinganalyzed (3-4.5 fb-1 ) 4.5 fb-1 Sep 2008 • Publicwebpages: • http://www-cdf.fnal.gov/physics/exotic/exotic.html • http://www-d0.fnal.gov/d0_publications/d0_pubs_list_runII_bytopic.html#np Pedro Mercadante

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