1. On the Brink of Revelation and Revolution: Electroweak Symmetry Breaking in 2008
2009
Dr. Richard St. Denis
Glasgow University
Royal Society of Edinburgh
February 7, 2007

2. Outline CDF Physics Reach and Physics Reached in last year
Virtual and nonvirtual Higgs detection
Tevatron
Higgs to WW
Susy
Conclusions

3. ? Deeper Physics Reach Bc PRODUCTION CROSS SECTION
Dms=17.77 ± 0.10 ± 0.07
Deeper Physics Reach
PRODUCTION CROSS SECTION LQ ?
8 orders of magnitude
W’, Z’, T’
Higgs ED Bc
 5.3 1.2 MeV/c2
Theory and Glasgow

4. SM Higgs Production HWW Hgg,HZZ WH,ZH,WWH VBF TTH 4 main mechanisms
Gluon Fusion Dominates at Tevatron: HWW
Associated Production: WH, ZH, WWH, TTH
WH,ZH,WWH
VBF
TTH

5. The Two Direct Paths
H to WW depends on jets, leptons (VBF too). Same at LHC, CDF. Have studied VBF and fascinating match of detectors to machines!
ttH depends on jets, b-jets: tagging and mass resolution. WH,ZH depends on same: Huge synergy. Very different path.
There are two natural divisions of effort: those that need silicon and those that don’t.

6. Virtual Measurement: Feb 06
Mh= GeV 68%CL
95% CL
Mh <186 GeV
Mh <219 GeV if LEP
DMt
219 GeV
DMw

7. Virtual Measurement: Feb 07
MPV = 80 GeV
The probability for MH > GeV is now 19% .
MH < C.L.

8. Projections on Virtual

9. The Tevatron picture is changing rapidly!

12. CDF Limits: Feb 2006
X 12
Jet Resolution

13. CDF Limits: Feb 2007
X 3.5

14. Already a long way from Run 1

15. Tevatron Lumi

16. In a few days CDF will have recorded 2 fb-1
2.3 fb-1 delivered
1.9 fb-1 to tape
653 pb-1 delivered in FY06, 82% to tape
~5% trigger deadtime, ~5% beam conditions, ~5% problems
In a few days CDF will have recorded 2 fb-1
A major milestone !

17. Run 2 Luminosity Highest initial Lum store: 2.7x1032
Best week: 45 pb-1 month 165 pb-1
Could get to 7 fb-1 by Oct 09

18. Instantaneous Lumi Needed
Current Peak
Peak Lumi Feb 2006

19. We’ve only analyzed this much data ~ 1 fb-1
And then some… 9 8 7 6 5 4 3 2 1
By end FY09
30 mA/hr
25 mA/hr
20 mA/hr
15 mA/hr
likely
Integrated Luminosity (fb-1)
By end FY07
We are here now
We’ve only analyzed this much data ~ 1 fb-1
9/30/ /30/ /30/ /30/ /30/ /30/ /30/09

20. Look at HWW

21. HWW/VBF Production Featuresq q' W+ W- H0 e- m+ ne nm
Missing Et
High Pt Leptons
Spin 0 Higgs correlates spins of leptons: e,m parallel and neutrinos also: Examine Df ll
Df ll ww
Z/g
VBF same as WW, but with forward jets. Do analyses together. Very unique events.
Not used YET!
2 forward jets, opposite in rapidity, high mass
VBF: Dhe-jet about

22. Events in 2fb-1 Mh(GeV/c2) 120 140 160 180 200 gg 28 66 82 58 32 vbf 2
Total 30 72 90 64 36
Detected 7 11 5

23. Integrated Luminosity (fb–1)
Signal Bias Scans: L00 B0W0L0
Integrated Luminosity (fb–1) 1 2
Depletion Voltage (V)
100 20 40 60 80

25. Calibrate Lepton ID: s(ppaZ0)xBr(Z0al+l-)
s=1.96 TeV
Calibrate Lepton ID: s(ppaZ0)xBr(Z0al+l-)
Worst Deviation: 1%

26. Event Selection(Main Cuts)
Isolation
M >16 GeV/c B Z WW H 2 ll
E > M /4 H WW Z t H
WW Dominated H WW H WW
Drell-Yan Dominated
H-Enhanced

27. Repeat with identical cuts but 1fb-1
Results: 360 pb-1
Shape Differs
Repeat with identical cuts but 1fb-1

28. Results: 1fb-1

40. x6

41. SUSY Two Higgs field doublets Five physical states: H0,h0,A0; H
Lightest Higgs (h0) mass close to EW scale
At tree level defined by mA and tanb=vu/vd
A couplings to b, t enhanced by tanb
For large tanb (ie. 40), h or H mass degenerate with A, similar couplings, other one is low mass (m<135 GeV/c2)

42. Blind Anlaysis: Look at mttvis
Att
Mode
Fraction(%)
Comment
tete 3
Large DY Bkg
tmtm
tetm 6
Low Jet bkg
tethad 23
Golden
tmthad
thadthad 51
Jet Bkg
Blind Anlaysis: Look at mttvis

46. 2007
Scenario from Feb 2006
2008
ATLAS 2007: Pilot Run, Z,W calib? 200pb-1
ATLAS 2008: Physics, 1fb-1
CDF 2007: 4fb-1 : HWW 4x3: at SM limit in the range. TOP and W Mass improved as well, so SM fit limits narrower.
Deviations building from expected limit: we focus on this range for ATLAS Perhaps SM fit narrowing on this range.
Higgs is OR Perhaps SM Fit excludes upper range.
CDF 2009: 3s at 120: ATLAS 2011? For discovery. CDF Keeps running!?
ATLAS 2010: 10fb-1 : Discover it for > 130.
2009
2008

47. x6

48. Summary These are remarkable times.
Rapid changes in data collected leading to exciting results. How to pull it together?
Plots to watch were earmarked last year: Mtop/Mw, Higgs sensitivity.
Mtop,Mw improvements give new mh
What is going on with WW? Just stats? D0 doesn’t see it. But Edinburgh/Glasgow theorists compute these things…
The Higgs mass drops and a 2s effect appears for the A which demands an associated mh in SUGRA/MSSM.
Double Lumi on tape (4x with 2 experiments)

49. Backup

50. ATLAS Channels W,Z we know! Deliberately Ignore gg Should we
MH(GeV) 5
W,Z we know!
Deliberately Ignore gg
Should we
invest in this?

51. Mt, Mw projections

52. Mtop Projection

53. Mw Projection

55. Acceptance(mH = 160 GeV) Cut Efficiency % Mll > 16 GeV Jet Veto
2 Isolated leptons (20, 10 GeV)
9.2
0.02
Mll > 16 GeV
96.1
0.04
Jet Veto
86.9
0.07
Opposite Sign
98.6
0.03
ETmiss > 50 MH/4
79.7
0.09
ETmiss > 50 GeV or ∆fTl/j >20o
98.8
Mll (1/2 x mH - 5) GeV
97.0
PT1 + PT2 + ETmiss < mH
0.05
Jet |h| < 2.5, 0-Jet or 15 < ETJet1 < 55 GeV
or 15 < ETJet2< 40 GeV
Muons |h| < 1.0, Electrons |h| < 2.0

56. Background and Signal MH = 160WW
25.4 8 WZ
0.94 ZZ
0.38
Sum WW
26.7 4
3.17 tt
1.20 Wg
3.54
Drell-Yan
2.78
fakes
1.71
SumNonWW
9.23
1.07
Total BG
35.9 7
3.35
HWW
2.24
0.31
Data 49

57. Improvements to Analysis: Associated Production Channels

58. CDF Channels NOW Ntupled 1fb-1
WH(lnbb)
Before
Selection!
(e2-7%)
Total
ZH(nnbb)
ZH(llbb)
gg-WW
WH-WWW
Used WW
correction
For VBF
VBF

59. Study Characteristics at Tev and LHC for 160^ q q' W+ W- H0 e- m+ ne nm

60. Pt, Rapidity of Leptons, Jets
Tev, MH=160
Pt, Rapidity of Leptons, Jets
Pt Quark can
be low
Reasonably
Triggerable
Electron
In CDF
Quark
Forward

61. Pt, Rapidity of Leptons, Jets
LHC, MH=160
Pt, Rapidity of Leptons, Jets
Pt Quark can
be low
Reasonably
Triggerable
Electron
In CDF:
wider distn
At LHC
Quark more
Forward

62. Rapidity of two quarks Max h of 2 quarks Min h of 2 quarks Dh of 2
Tev, MH=160
Rapidity of two quarks
Max h
of 2
quarks
Min h
of 2
quarks Dh
of 2
quarks

63. Rapidity of two quarks Max h of 2 Quarks Min h wider – wider Dh of 2
LHC, MH=160
Rapidity of two quarks
Max h
of 2
Quarks
wider
Min h –
wider Dh
of 2
Quarks
wider

64. Missing Energy 60 GeV Met Met vs Pte Met 180o from e Quark can
Tev, MH=160
Missing Energy
60 GeV
Met
Met vs
Pte
Met 180o from e
Quark can
be along
Met

65. LHC, MH=160
Missing Energy
A bit larger at LHC

66. Lepton Correlations:e-ne
Tev, MH=160
Lepton Correlations:e-ne
Df (e,ne)
e,neanticorrelated in f

67. Lepton Correlations:e-ne
LHC, MH=160
Lepton Correlations:e-ne
Df (e,ne)
e,ne anticorrelated less sharply in f

68. Lepton Correlations: e-m
Tev, MH=160
Lepton Correlations: e-m
e,m correlated
in y,phi and
have high pt DR

69. LHC, MH=160
Lepton Correlations
e,m better
correlated

70. Masses Mt for e m n Large Invariant Mass between leptons
Tev, MH=160
Mt for e m n
Large Invariant
Mass between
leptons
High Invariant
Mass between
quarks

71. Masses Mt for e m n Larger Invariant Mass between leptons
LHC, MH=160
Mt for e m n
Larger Invariant
Mass between
leptons
Higher Invariant
Mass between
quarks

72. Electron-Jet Separation
Tev, MH=160
Electron-Jet Separation

73. Electron-Jet Separation
LHC, MH=160
Electron-Jet Separation
Same l-j
separation