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SUSY

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SUSY in Run I at the Tevatron - examples of analysis not ... (Aleph M(Stop) 95) Andy White Physics at LHC Prague, July 2003. 34. Stop, sbottom in Run II ... – PowerPoint PPT presentation

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Title: SUSY


1
SUSY Tevatron Results and Physics Potential
Andy White University of Texas at Arlington for
the D0 and CDF Collaborations
2
Contents
  • SUSY in Run I at the Tevatron
  • - examples of analysis not comprehensive
  • - parameter space access/coverage
  • Tevatron Run II
  • - D0/CDF detector upgrades
  • - Accelerator, luminosity
  • SUSY in Run II at the Tevatron
  • - Analyses started
  • - Physics potential

3
SUSY Cross sections are small !
Indicated ? points are for m1/2 150 GeV m0
100GeV A0 300 GeV tan? 4 ? gt0
Cross sections (pb)
4
SUSY in Run I
  • - Energy 1.8 TeV
  • 100 pb-1 of data analyzed
  • Many channels studied
  • Classic SUSY - Jets and Met
  • Squarks gluinos with leptonic decay(s)
  • Gaugino production, leptonic decay
  • Stop, Bottom
  • Alternatives e.g. GMSB, RPV,

5
Some examples from Run I
CDF
D0
6
mSUGRA parameter space coverage
D0
7
Run II SUSY/Higgs Workshop hep-ph/0003154
Typical Run I results
8
Stop and sbottom searches
9
Stop and sbottom searches
10
D0 results for RPV SUSY tri-leptons
Reinterpretation of trilepton gaugino pair
production results for mSUGRA with R-parity,
Lepton number violation. LSP -gt
Leptons ?ijkLiLjEkC Enhanced multilepton events
Li
11
CDF a hint of something new from Run I ??
  • - Low probability from SM sources model
    independent study with l, ?, MEt.
  • Subject of much speculation! GMSB explanation
    Gravitino LSP?
  • Motivation for many searches in Run II

12
Run II at the Tevatron
  • New accelerator components Main Injector
  • Upgraded D0 and CDF detectors
  • Higher beam energies larger cross-sections
  • Substantially expanded worldwide participation
  • SUSY analyses underway for D0 and CDF
  • Predictions for Runs IIa, IIb from Fermilab
    Workshop, e.g. SUGRA in hep-ph/0003154.

13
CDF upgrades for Run II
14
CDF improvements for SUSY searches
  • New tracking system (Si and central)
  • Extended coverage for electrons and muons
  • New forward (plug) calorimeter improves Met
  • TOF for charged massive stable particles
  • New/improved triggers for MEt, ?

15
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16
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17
New forward components of the D0 detector
Intercryostat detector
Forward pre-shower
18
D0 improvements for SUSY searches
  • Solenoid completely new tracking added
  • Improved muon tracking and triggering
  • Improved electron id. (preshowers)
  • Central track trigger
  • Triggering on b jets
  • New Intercryostat Detector (jets, MEt)

19
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20
Run II SUSY Searches
  • Examples of Run II results here are from
    Winter/Spring conferences expect significant
    updates, increased ?Ldt this summer.
  • Both experiments use two approaches

Theory/model motivated analysis
Model independent analysis
Optimize analysis with model studies
Generic search safety net
21
Jets MEt
The challenge QCD (jets) -gt high rate -gt
residual tail. D0 - study with 4 pb-1 has
shown that, with cuts to reduce fake MEt, the
tail can be understood.
22
Jets MEt expectations
Run II 2 fb-1 search region
hep-ph/0003154
23
Photons MEt
Gauge mediated SUSY breaking (GMSB) with light
Gravitino LSP can yield ?? MEt
where N is next-to-lightest SUSY particle.
24
Observe 2 events, expect bkg 22 events
CDF Run II
From S-W Lee/SUSY 2003
M 2?, N5 1 tan ? 15, ? gt 0
25
66 GeV limit from 50 pb-1
D0 Run II
M 2?, N5 1 tan ? 15, ? gt 0
26
Tri-lepton final states
?s !
27
Tri-lepton final states
42 pb-1
Di-electron sample cuts
Efficiencies few percent Will improve over
LEP-2 with gt300 pb-1
28
Tri-lepton final states
Studies for ? channels
D0 Z -gt ?? -gt (e??) (h?)
  • Pt(e) gt 12 GeV isolated
  • Pt(jet) gt 7 GeV
  • - Jet/e not back to back
  • - Cut on Z -gt ee
  • Use Neural net for tau id.

D0 Run II preliminary 50pb-1
29
Tri-lepton final states
CDF Z -gt ? ?
30
Tri-lepton final states
Soft cuts to pick up ?-gte, ?. Cuts varied to
optimize S/?B.
Dilepton plus Tau jet
31
D0 model independent search in e?
  • - Results from 30 pb-1
  • - SM mis-ID backgrounds
  • Main bkgds Z-gt??, WW, tt
  • - Derive ? limits vs MEt cut

32
D0 model independent search in e?
100 fb
33
Long lived Stop from TOF
CDF GMSB with NLSP stable Stop particle.
?t gt 2.5 ns, Pt gt 40 GeV/c Expect 2.9 0.7 3.1
ev. Observe 7 events M(Stop) gt 108 GeV/c2 at 95
CL (Aleph M(Stop) gt 95)
34
Stop, sbottom in Run II
35
CONCLUSIONS
  • Many interesting results from Run I at O(100
    pb-1)
  • Energy and Luminosity upgrades for Tevatron
  • Large scale D0 and CDF detector upgrades
  • - detectors fully commissioned and taking
    data
  • with high efficiencies.
  • Comprehensive program of SUSY searches for
  • Run II window(s) of opportunity before LHC!

36
Fermilab Run II Accelerator Systems
37
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38
F. Gianotti talk at D0 Summer 2003 Workshop,
Beaune, France
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