1. The Tevatron Connection
and comparisons with theory!
A Few CDF Run 2 Proton-AntiProton Cross Sections
Top Pair Cross-Section
Single Top Cross-Section
J/Y Cross-Section
b-Hadron Cross-Section
b-Jet & b-DiJet Cross-Sections
Charm Meson Cross-Sections
g + b/c Cross-Sections
g + g Cross-Section
Z-boson Cross-Section
We now have
over 400 pb-1 of
data!
W-boson Cross-Section
W+n Jets Cross-Sections
W/Z + g Cross-Sections
W + W Cross-Section
Z + W & Z + Z Cross-Sections
Inclusive Jet Cross-Sections
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

2. Top Pair Cross Section CDF Run 2 Summary
200 pb-1
Observed cross sections consistent with each other and with the standard model prediction (1.96 TeV, mt = 175 GeV)
Bonciani et al., Nucl. Phys. B529, 424 (1998)
Kidonakis and Vogt, Phys. Rev. D68, (2003)
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

3. Single Top Cross Section CDF Run 2 Search
s-channel
0.88 pb
1.98 pb
t-channel
t-channel
Search for W + 2 jets and tag one b. Do likelihood fit to HT (s+t channed combined).
st < % CL
st+s < % CL
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

4. The J/Y Cross Section CDF Run 2
The J/y inclusive cross-section includes contribution from the direct production of J/y and from decays from excited charmonium, Y(2S), and from the decays of b-hadrons, B-> J/y + X.
J/ K B 
J/y coming from b-hadrons
will be displaced from primary vertex!
39.7 pb-1
Down to PT = 0!
CDF (mb)
s(J/Y, |Y(J/Y)| < 0.6)
4.080.02(stat)+0.36(sys)-0.48(sys)
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

5. b-hadron Cross Section CDF Run 2
Run 2 b-hadron PT distribution compared with FONLL (CTEQ6M).
Cacciari, Frixone, Mangano, Nason, Ridolfi
Excellent agreement between theory and experiment!
39.7 pb-1
|Y| < 1.0
b-hadron PT
CDF (mb)
FONLL (mb)
s(b-hadron)
29.40.6(stat)6.2(sys)
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

6. b-Jet Cross Sections CDF Run 2
Arbitrary normalization!
b-quark tag based on displaced vertices. Secondary vertex mass discriminates flavor.
Require one secondary vertex tagged b-jet within 0.1 < |y|< 0.7 and plot the inclusive jet PT distribution (MidPoint, R = 0.7).
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

7. b-DiJet Cross Section CDF Run 2
Normalized to one!
bJet-bbarJet invariant mass
bJet-bbarJet Df
Require two secondary vertex tagged b-jets within |h|< 1.2. One of these tagged jets has to have a corrected tranverse energy greater than 30 GeV, the other has to have a raw transverse energy greater than 10 GeV.
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

8. Prompt Charm Meson Cross Sections CDF Run 2
Theory calculation from M. Cacciari and P. Nason: Resummed perturbative QCD (FONLL), JHEP 0309,006 (2003)
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

9. g + b/c Cross Sections CDF Run 2
b/c-quark tag based on displaced vertices. Secondary vertex mass discriminates flavor.
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

10. g + b/c Cross Sections CDF Run 2
g + c
CDF (pb)
s(b+g)
40.619.5(stat)+7.4(sys)-7.8(sys)
s(c+g)
486.2152.9(stat)+86.5(sys)-90.9(sys)
PYTHIA Tune A correctly predicts the relative amount of u, d, s, c, b quarks within the photon events.
ET(g) > 25 GeV
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

11. g + g Cross Section CDF Run 2
g + g Df
g + g mass
Di-Photon cross section with 207 pb-1 of Run 2 data compared with next-to-leading order QCD predictions from DIPHOX and ResBos.
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

12. Z-boson Cross Section CDF Run 2
Impressive agreement between experiment and NNLO theory (Stirling, van Neerven)!
CDF (pb)
NNLO (pb)
s(Z)
254.93.3(stat)4.6(sys)15.2(lum)
251.35.0
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

13. W-boson Cross Sections CDF Run 2
NNLO
s(W)/s(Z)
10.920.15(stat)0.14(sys)
10.690.08
Impressive agreement between experiment and NNLO theory (Stirling, van Neerven)!
CDF (pb)
NNLO(pb)
s(W)
277510(stat)53(sys)167(lum)
268754
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

14. W + n Jets Cross Sections CDF Run 2
Alpgen + HERWIG
Run 2 W + n Jets Cross Section compared with Run 1 (JetClu, R = 0.4).
Run 2 data compared with Alpgen + HERWIG.
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

15. W + g Cross Sections CDF Run 2
ET(g) > 7 GeV
R(lg) > 0.7
CDF (pb)
NLO (pb)
s(W+g)*BR(W->ln)
19.71.7(stat)2.0(sys)1.1(lum)
19.31.4
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

16. Z + g Cross Sections CDF Run 2
Note: (W)/(Z) ≈ 4
while (W)/(Z) ≈ 11
ET(g) > 7 GeV
R(lg) > 0.7
CDF (pb)
NLO (pb)
s(Z+g)*BR(Z->ll)
5.30.6(stat)0.3(sys)0.3(lum)
5.40.3
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

17. W+W Cross Section CDF Run 2
Campbell & Ellis 1999
CDF (pb)
NLO (pb)
s(WW) (e,m)
(stat)-4.9(stat)1.6(sys)0.9(lum)
12.50.8
s(WW) (l+track)
19.45.1(stat)3.5(sys)1.2(lum)
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

18. Z+W, Z+Z Cross Sections CDF Run 2
Upper Limit
CDF (pb)
NLO (pb)
W+Z, Z+Z
< 13.9 (95% CL)
5.20.4
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

19. Inclusive Jet Cross Section CDF Run 2
353 pb-1!
ET > 500 GeV!
Parton Level!
Calorimeter Level!
The challenge is that we measure the jets at the “calorimeter level”. We do not measure partons!
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida

20. Inclusive Kt Jet Cross Section CDF Run 2
I wish we had a QCD
NLO Monte-Carlo
Model with Parton-Showers,
Fragmentation, Beam-Beam
Remnants, etc.!
We are using Kt and MidPoint in Run 2!
The Run 2 Kt inclusive jet cross section compared with PYTHIA Tune A (CTEQ5L).
The Tevatron Connection August 9-10, 2004
Rick Field - CDF/Florida