1. CDF status m. spiropulu EFI/UofC Oct 25 2002
HUMBOLDT UNIVERSITY - HIGH ENERGY PHYSICS SEMINAR
CDF status m. spiropulu EFI/UofC Oct

2. Outline New results from old data Missing Energy+monojet
New results and status with RUNII data

8. ,

16. Run II is the most important activity at Fermilab.
RunIIa Luminosity Goals
5-8 E31 cm-2/sec (w/o Recycler)
10-20 E31 cm-2/sec (w/ Recycler)
integrated: 2-5 fb-1 (2004)
RunIIb Luminosity Goals
40-50 E31 cm-2/sec
integrated: 15 fb-1 (2007)
s(W), s(Z) ~10% higher
s(tt) ~35% higher
The collider performance in Run II got off to a slow start.
The Beams Division made quick progress on the luminosity:
The peak luminosity increased from ~0.9E31 on 3/25/02 to ~1.8E31 by 5/10/02 to 3.6E31 by 10/5/02.
Many problems identified; some solutions found; some to be.
Still improving collider performance.
* For most of Run Ib, average luminosity at start of store was
~1.6x1031 cm-2 s-1. Integrated luminosity delivered was ~0.15 fb-1.

17. beamloading compensation
new injection helix
Step 13
AA->MI optics
Jan. HEPAP

19. January 1 – June 1 June 3-14 June 15 – December 31
Improve antiproton efficiency from Accumulator to Tevatron low-b
Improve proton intensity at Tevatron low-b
Commission Recycler parasitically
June 3-14
Shutdown to install new Accumulator transverse core cooling
June 15 – December 31
Improve stacking rate
Shutdown for continuing Recycler vacuum work (tentatively scheduled September 30-November 10)
Integrate Recycler into operations
Minimize access time

20. Underlying Accelerator Physics Issues
Three primary accelerator physics issues are being dealt with:
Accumulator emittance/heating
Intrabeam scattering appears implicated as major source
Long range beam-beam in the Tevatron
Manifested as poor antiproton lifetime at 150 GeV
Once collision configuration achieved, this is not impacting performance
Contribution to lifetime from vacuum under investigation
Proton longitudinal emittance
Beamloading compensation implemented  some improvement, but appears to be growth during acceleration in Main Injector.
These issues interconnect many of the individual performance parameters
Progress requires attacking everything in parallel.

21. Physics in Run II
Precision measurements, looking for an inconsistency with the Standard Model:
top quark and W boson properties
measurements of B mixing and CP parameters
Possible discoveries include the Higgs boson or any new physics at the Tevatron mass scale:
Higgs boson
Supersymmetry
Extra dimensions
New dynamics (technicolor, new gauge bosons)
Quark or lepton compositeness.

22. Prospective physics highlights at 0.1-0.3 fb-1
Even with a data sample of this size, there will be many new physics results.
New detectors have increased capability
Ecm changed from 1.80 to 1.96 TeV, significantly increasing cross sections for high-mass states.
Production of top, bottom, and charm quarks, W and Z, jets
B Physics: Start of a broad program: spectroscopy, lifetimes, and mixing
0.3 fb-1
Major new results in every area
Top quark: Mass measurement with twice current precision
CP violation: Bs mixing to xs = 25
New physics searches:
Extra dimensions with scale of 1.6 TeV
Confirmation or elimination of new physics indicated by Run I observation of rare events
QCD: Jet spectrum at highest transverse energy

23. Prospective physics highlights at 1-2 fb-1
Electroweak
W magnetic moment, signals for WW and W+Z production
top quark properties with 1000 top events per experiment
Supersymmetry
possible signals in trileptons
SUSY Higgs signal for m(A) ~ 100 GeV, tan b= 35
B Physics
Lb lifetime to 0.06 ps
2 fb-1
Electroweak:
W boson mass measured to greater precision than from LEP
top quark mass to 2.7 GeV/expt
Higgs
95% exclusion of Higgs boson with mass of 115 GeV
Supersymmetry
observe squarks and gluinos if gluino masses below 400 GeV
observe chargino/neutralinos if mass below 180 GeV, tanb = 2
CP violation and Bottom quark
Measurement of decay mode Bd g K*m+m- with 60 events
Bs mixing to xs = 40

24. Prospective physics highlights at 4-8 fb-1
Higgs: 95% exclusion of standard Higgs boson up to 125 GeV
Supersymmetry
discovery of supersymmetry in large fraction of parameter space for minimal supersymmetry
discovery of SUSY Higgs for m(A)~150 GeV, tanb = 35
8 fb-1
Higgs
3s evidence for standard Higgs with mass less than 122 GeV
95% exclusion of standard Higgs for masses below 135 GeV or from GeV
Supersymmetry:
95% exclusion of the minimal supersymmetric Higgs in the maximal mixing model

25. Prospective physics highlights at 15 fb-1
Higgs
4-5s evidence for standard Higgs with mass of 115 GeV
95% exclusion of standard Higgs for all masses below 185 GeV
Supersymmetry
SUSY trilepton signal extended to large tanb and gluino masses GeV
possible discovery of supersymmetric Higgs boson m(A) up to 200 GeV, tanb = 35
Electroweak
top quark mass measurement with error of 1.3 GeV/expt
W mass measurement with error of 15 MeV/expt

26. CDF-II detector is recording quality data (ICHEP 2002)
Stable physics running established in early 2002
intensive effort during fall 2001 shutdown had big payoff
silicon coverage, trigger came together very quickly
> 95% / 90% / 80% of L00/SVX/ISL now (summer 2002) regularly read out
L1/L2/L3 trigger <1% deadtime (BW 40K/300/70)
trigger algorithms increased rapidly in sophistication; now quite stable
~140 separate trigger paths (e, m, t, n, g, jet, displaced track, b jet, …)
33.0/pb delivered; 23.5/pb recorded January-June 2002
~10.0/pb pass the most stringent analyses’ “good run” criteria

27. CDF II Detector All critical components are working well
132 ns front end
COT
SVX
40000/300/70 Hz
~no dead time
7-8 silicon layers
rf, rz, stereo views
z0max=45, max=2
2<R<30cm
Double b tags essential
for Mtop, Hbb
TOF
30240 chnl, 96 layer
drift chamber
s(1/pT) ~ 0.1%/GeV
s(hit) ~ 150mm
 coverage
extended to
=1.5
Tile/fiber endcap
calorimeter (faster,
larger Fsamp, no gap)

28. CDF II Detector Major qualitative improvements over Run 1 detector:
Whole detector can run up to 132 nsec interbunch
New full coverage 7-8 layer 3-D Si-tracking up to |h| ~ 2
New faster drift chamber with 96 layers
New TOF system
New plug calorimeter
New forward muon system
New track trigger at Level 1 (XFT)
New impact parameter trigger at Level 2 (SVT)
All systems working well
Silicon and L2 took longer to commission
Forward region restructured

29. CDF Run II physics now Re-establish Run I physics signals
prepare for high-PT program: Mtop, MW, Higgs, SUSY, Z’, LED
reconstruct and model leptons, W’s, Z’s, jets, b’s, …
essential feedback for detector/trigger/reconstruction/simulation
measure s(W)/s(Z); measure D-Y angular distributions
Calibrate precision track measurements
exploit high cross-section signals; measure B lifetimes, masses
begins B physics program (lifetimes, masses, Bs mixing, CP, Lb, Bc, …)
provides calibration/tools for MW, Mtop, b jet tagging
Exploit new trigger capabilities
Measure DM(Ds,D+); measure B(D0  KK, pp) / B(D0  Kp)
Learn to model trigger for physics signals (later  Zbb, Hbb)
Reconstruct fully hadronic B decays

30. XFT: L1 trigger on tracks
Offline
track
Efficiency curve:
XFT cut at
PT = 1.5 GeV/c
XFT
track
XFT: L1 trigger on tracks
full design resolution
DpT/p2T = 1.8% (GeV-1)
Df = 8 mrad

31. High-PT muons: Z m+m- Z m+m- signal require COT•CMU•CMP
CDF’s purest muons: ~8l m1
CMU m2
CMP
57 candidates 66<M<116 GeV
NZ = 53.2±7.5 ±2.7

32. Measurement of sB(Wmn), R
4561 candidates in 16 pb-1
12.5% background:
- Z mm: ± 13
- Wtn: ± 10
- QCD: ± 53
- Cosmics: ± 30
s•B(Wmn) = 2.70±.04stat±.19syst ±.27lum
Many uncertainties, e.g. lumi, cancel in ratio:
R = s•B(Wmn) / s•B(Zmm) = 13.66±1.94stat±1.12syst (1.5s from SM)
 G(W) = 1.67±0.24stat±0.14syst
Measure a precisely predicted ratio  establish tight feedback loop on
muon detection, reconstruction, and simulation MT

33. Measure s•B(Wen) W cross section: 0.16 soon! sW*BR(Wen) (nb) =
2.60±0.07stat±0.11syst ±0.26lum
0.16 soon!
Background (8%):
- QCD: 260 ± 34 ± 78
- Z ee: 54 ± 2 ± 3
- Wtn: 95 ± 6 ± 1
5547 candidates in 10 pb-1

34. Modeling Wen calibrates e,n,tracks, ...
+CEM
s(missing ET)
s(E/p) ~ 5.7% ( cal  track )
(within 20% of Run I resolution)
expect improvements as
calibrations continue
SET (GeV)
Missing energy resolution from minimum-bias data consistent with Run 1

35. Reconstruct Z  ee; measure AFB
Both e ||>1
NZ(PP) = 160
Both e ||<1
NZ(CC) = 247
s(M) ~ 4 GeV
Uses
silicon
to tag e±
charge
Central-Plug Dielectron Mass
AFB will be an additional
handle in Z’ searches
One ||<1, one ||>1
NZ(CP) = 391

36. W  t n Evidence for typical t decay multiplicity in W t n selections
t channel important for new physics searches

37. Jet reconstruction/measurement essential for Mtop, searches ...
Jet 1: ET = 403 GeV
Jet 2: ET = 322 GeV
Run II jet energy calibrations
in progress. In ||<1 region,
we reproduce Run I calibrations
to ~5% level thus far.

38. Brand new detector: TOF
TOF resolution within 10–20% of 100 ps design value (calibration ongoing)
TOF
S/N = 1:2.5
S/N = 1:40
Novel uses (beyond K tagging) in the works:
• CHAMPS search (large flight time)
• magnetic monopole trigger (large pulse height)

39. Precision momentum measurement
COT tracking (measured)
e = 99±1% (L3/offline reco)
e = 96.1±0.1% (L1 trigger)
s(1/pT) < 0.13%/GeV (offline)
s(1/pT) = 1.8%/GeV (L1 trigger)
Run II trigger efficient down to
pT(m)=1.5 GeV

40. Material & Momentum Calibration
Use J/y’s to understand E-loss and B-field corrections
s(scale)/scale ~ 0.02%. Check with other known signals D0
Raw tracks
Correct for material in GEANT
Tune missing material ~20%
Add B scale correction
confirm
with
gee U 1S 2S 3S mm

41. Meson mass measurements
B masses:
y(2S)J/y p+p- (control)
Bu J/y K+
Bd J/y K0* (K0*K+p-)
Bs J/y f (fK+K-)
BsJ/yf
18.4/pb
More mass plots
CDF DPDG/s
y(2S) ±
Bu ±1.7 ±
Bd ±1.9 ±
Bs ±3.8 ±
BJ/yK
18.4/pb Bu
2.1
2.9

42. Precision vertex measurement
Silicon detectors:
Typical S/N ~12
Alignment in R-f mature
Hit resolution as expected
before alignment
Drf
+/- 20 mm
after alignment
Drf
+/- 3 mm
Details

43. B hadron lifetimes Inclusive B lifetime with J/y’s
Fit pseudo-ct = Lxyy*FMC*My/pTy ct=458±10stat. ±11syst. mm
(PDG: 469±4 mm)
Exclusive B+J/yK+ lifetime
ct=446 ±43stat. ±13syst. mm
(PDG: 502±5 mm)
J/y from B = 17%
# B ~ 154

44. Trigger selects B’s via semileptonic decays ...
1910119
candidates
34922
candidates
Run II trigger & silicon =>
~3 yield/luminosity as in Run I
(and likely to improve further with optimization)
61647
candidates

45. Hadronic B trigger Secondary Vertex L2 Trigger Online track impact
param.
s=48 mm
includes
~33 mm
beamspot
~150 VME boards/8 crates find & fit silicon tracks in 20 ms with offline accuracy
Secondary Vertex L2 Trigger
D resolution as planned
48 mm (33 mm beam spot transverse size)
Online fit/subtraction of beam position
Efficiency

46. SVT selects huge charm signals
L2 trigger on 2 tracks:
pt > 2 GeV
|D| > 100 mm (2 body)
|D| > 120 mm (multibody)
Whopping charm samples!
Will have O( 107 ) fully reconstructed decays in 2/fb data set
FOCUS = today’s standard for huge: 139K D0K-p+, 110K D+K-p+p+
A substantial fraction comes from b decays
56320 D0
25570 D±

47. Fraction of charm from b decays
D mesons:
What fraction from B?
D0: %
D*+: %
D+: %
Ds+: %
K0S
Gaussian

48. Measure Ds, D+ mass difference
Both D  fp (fKK)
Dm=99.28±0.43±0.27 MeV
PDG: 99.2±0.5 MeV
(CLEO2, E691)
Systematics dominated by background modeling
11.6 pb-1
~2400
events
~1400
events

49. Measure Cabibbo-suppressed decay rates
G(DKK)/G(DKp) = (11.17±0.48±0.98)% (PDG: 10.83±0.27)
Main systematic (8%): background subtraction (E687, E791, CLEO2)
G(Dpp)/G(DKp) = (3.37±0.20±0.16)% (PDG: ±0.17)
several ~2% systematics
This measurement has pushed the state of the art on modeling SVT sculpting--essential simulation tools for both B physics program and e.g. high-pT b-jet triggers
Future?
- CP violation
- mixing
- rare decays
Monster Kp
reflection here ...

50. Toward Bs mixing! B+  D0 p+ #B± = 56±12 We observe hadronic B decays!
constant
multiplicative error
~ 15% (semileptonic)
~ 0.5% (hadronic)
B+  D0 p+
Need fully reconstructed (hadronic) decays
to see past first couple of oscillation periods
We observe hadronic B decays!
Yields understood to ~20% level from detailed simulation
Next steps:
Reconstruct Bs Dsp, Ds fp
Flavor tagging algorithms
Exploit  3 SVX acceptance, SVT efficiency improvements

51. Full silicon acceptance is in sight … The last 10% of the job takes the second 90% of the effort (but not time!)
Commissioning:
L00 > 95%
SVXII > 90%
ISL > 80%
ISL completing cooling work
% of silicon ladders powered and read-out by silicon system vs. time

52. 2-body hadronic B decays observed
—sum
BdKp
BsKK
Bdpp
BsKp
CDF II
simulation
Width
~45MeV
#B = 33±9
B  h+ h-
Yield lower than expected (now improved)
S/N better than expected
CP asymmetry measurements (a , g) possible with large samples

53. CDF Taking good quality data during 2002
Many new capabilities of detector and trigger
Each Run II pb-1 worth much more than each Run I pb-1!
And of course 9% more W,Z; 35% more tt at 1.96 TeV
Many early physics results
sB(Wln), sB(W mn) / sB(Z mm)
m(B), t(B), DM(Ds,D+), BR(D0 KK,pp)
Tooling up for MW, Mtop, SUSY searches, Higgs search

55. Run IIb
Additional luminosity provides greater precision for electroweak measurements, greater reach for exotic searches, plus the opportunity to observe a low-mass Higgs boson.
Accelerator
Improve luminosity by factor of 2-3 with a number of modest upgrades.
Accelerator advisory committee reviewing progress.
Right now, the attention must be concentrated on run IIa.
Detectors
Two upgrade projects:
Replace partly rad-damaged silicon detectors with new detectors of simpler design with more rad-hard technology.
Upgrade data acquisition and triggers to deal with higher luminosity.
PAC has been following projects, Stage 1 approval discussion at Aspen