1 / 14

Chris Hays, Duke University for the CDF Collaboration

Searches for. New Particles and Phenomena. at CDF. Chris Hays, Duke University for the CDF Collaboration. Fermilab Frontier. Structure of Matter. Interaction Time Scale. 10 -20 sec. 10 -24 sec. 10 -28 sec. 10 -32 sec. 10 -36 sec. 10 -40 sec. 10 -44 sec. Atom. Nucleus.

quon-mclaughlin
Télécharger la présentation

Chris Hays, Duke University for the CDF Collaboration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Searches for New Particles and Phenomena at CDF Chris Hays, Duke University for the CDF Collaboration

  2. Fermilab Frontier Structure of Matter Interaction Time Scale 10-20 sec 10-24 sec 10-28 sec 10-32 sec 10-36 sec 10-40 sec 10-44 sec Atom Nucleus particle string? 10-11 m 10-15 m 10-19 m 10-23 m 10-27 m 10-31 m 10-35 m Distance Scale ( ) ( ) ( ) u d c s t b Chiral Color? SU(3) g Right-handed Weak Force? Axigluons? ( ) ( ) ( ) Supersymmetry? Grand Unification? SU(2) e ne m nm t nt Leptoquarks? W,Z Monopole? Strong Gravity? Z'? H++? Electroweak Unification q*? e*? Higgs? Extra Dimensions? U(1) Technicolor? Unitarity violation (WW scattering) g Strings? H0? Compositeness? History of the Universe Age of Universe 10-20 sec 10-28 sec 10-36 sec 10-44 sec 104 sec 10-4 sec 10-12 sec 104 TeV 108 TeV 1012 TeV 1016 TeV 10-8 TeV 10-4 TeV 1 TeV Temperature of Universe

  3. m END WALL 2.0 HADRON = 1.0 n CAL. 0 30 SOLENOID 1.5 1.0 = 2.0 n COT END PLUG HADRON CALORIMETER END PLUG EM CALORIMETER .5 = 3.0 n 0 3 0 2.5 0 .5 1.0 1.5 2.0 3.0 m Intermediate silicon Inner silicon 1 or 2 layers 6 layers CDF Detector Reconstructed Objects MUON UPGRADE (CMP) STEEL CENTRAL MUON (CMU) MUON EXTENSION (CMX) CENTRAL HAD. CALORIMETER CENTRAL EM CALORIMETER h=1.0 q or g “jet” g e m

  4. Excited Electrons Composite electrons have excited states Excited electron decays to e+g Zg dominant background Expect 1 event with mee= Z Observe 1 event (mee= Z), 0 events (mee = Z)

  5. Doubly-Charged Particles X++/-- e+/- e+/- ( ) H0 H+ H++ Doubly-charged Higgs L-R symmetric model: m SU(2)LxSU(2)R m m ~ l nL l m Explains light neutrino masses NR 0 events observed Search mass windows Z ee W+jet

  6. Doubly-Charged Particles m+/- m+/- X++/-- Cosmic rays dominant background W+jets dijets CDF RUN II PRELIMINARY cosmics Expect 0.9±0.2events (mass>80 GeV) 2 events observed: m=160, 760 GeV H++/-- mass > 110 GeV (LEP: > 100 GeV)

  7. Dijet Mass Search Sensitive to variety of new physics Probes highest available energies Excludes axigluon mass < 1.1 TeV

  8. Dilepton Mass Search Search for neutral resonances Graviton Theory with 1 extra dimension Z’ Run 1: > 690 GeV

  9. Long-Lived Charged Particles Search for heavy, slow particles 4th generation quarks “stable” supersymmetric top quarks DTOF>2.5 ns Tracks with long flight time (>d/c) Expect 2.9±3.1 events, observe 7 stop mass > 108 GeV (LEP: > 95 GeV)

  10. Leptoquarks Directly couple quarks to leptons Predicted by Grand Unified Theories One LQ per generation at low mass LQ qe (qn) pp LQ qe (qn) qqee qqen Expect 3.4±3.2 events, observe 0 Expect 1.9±1.3 events, observe 1 CDF+DØ Run 1: mLQ > 242 GeV DØ Run 1: mLQ > 204 GeV MLQ>230 GeV MLQ>177 GeV

  11. Leptoquarks LQ qn pp LQ qn Sensitive to leptoquarks of all 3 generations 2 jets + Missing Energy challenging experimental signature Many Standard Model, detector backgrounds Requires understanding of calorimeter noise and cracks qqnn W, Z + jets QCD multijet production DØ Run 1: mLQ > 98 GeV

  12. Diphoton Search Gauge-mediated supersymmetry breaking predicts ggET signature c1 No excess at high ET for g ET> 25 GeV Gg pp c1 Gg Diphoton sample understood ...or for g ET> 13 GeV

  13. Still Searching... Past year of data has provided increased sensitivity to new physics Supersymmetry Compositeness Technicolor Chiral color Right-handed weak force ...and new particles Excited electrons Diquarks Doubly-charged Higgs Gravitons Leptoquarks Supersymmetric top quarks Coming year will provide even more sensitivity to new physics and particles SUGRA (Bsmm) chargino, neutralino (trileptons) stop, LQ (2 jets + ET, with heavy flavor tagging) magnetic monopoles

  14. gET Search Variety of new physics with gET signature Supersymmetry Clean up ET Large Extra Dimensions Clean up photons Observed events consistent with background prediction

More Related