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/Ψ
Ψ Cross-Section
! b-Hadron Cross-Section
! b-Jet & b-DiJet Cross-Sections
! Charm Meson Cross-Sections
! γ + b/c Cross-Sections
! γ + γ Cross-Section
! Z-boson Cross-Section
! W-boson Cross-Section
! W+n Jets Cross-Sections
! W/Z + γ Cross-Sections
! W + W Cross-Section
! Z + W & Z + Z Cross-Sections
! Inclusive Jet Cross-Sections
The Tevatron Connection
August 9-10, 2004
c-quark
b-quark
photon
b-jetjet
Z-boson
photon
jetW-boson
t-quark
b-quark
proton
Antiproton
W-boson
Z-boson
Charm
Top
Pair
W
Single
Top
b-hadron
W
W
W+jets
γ
W
+TeV
γZ
γb-jet
Ψ
++
b
J/Ψ
Jets
1.96
Beam-Beam Remnants
We now have
over 400 pb-1 of
data!
Rick Field - CDF/Florida
uud
W-boson
b-jet
jet
Beam-Beam Remnants
t-quark
photon
c-quark
b-quark
Ψ
J/Ψ
Page 1
Top Pair Cross Section
CDF Run
200 pb2 Summary
-1
! Observed cross sections consistent with
each other and with the standard
model prediction (1.96 TeV, mt = 175
GeV)
σ (tt ) = 6.7 +0.7 pb
−0.9
Bonciani et al., Nucl. Phys. B529, 424 (1998)
Kidonakis and Vogt, Phys. Rev. D68, 114014 (2003)
The Tevatron Connection
August 9-10, 2004
Rick Field - CDF/Florida
Page 2
Single Top Cross Section
CDF Run 2 Search
s-channel
0.88 pb
1.98 pb
t-channel
t-channel
σt < 10.1 pb @ 95% CL
σt+s < 17.8 pb @ 95% CL
The Tevatron Connection
August 9-10, 2004
! Search for W + 2 jets and tag one b.
Do likelihood fit to HT (s+t channed
combined).
Rick Field - CDF/Florida
Page 3
The J/Ψ Cross Section
CDF Run 2
! The J/ψ
ψ inclusive cross-section
includes contribution from the
direct production of J/ψ
ψ and from
decays from excited charmonium,
Ψ(2S), and from the decays of bhadrons, B-> J/ψ
ψ + X.
µ
ψ coming from b-hadrons
J/ψ
will be displaced from
primary vertex!
Down to
PT = 0!
J/ψ
µ
39.7 pb-1
B
K
CDF (µ
µb)
σ(J/Ψ,
Ψ, |Y(J/Ψ
Ψ)| < 0.6)
The Tevatron Connection
August 9-10, 2004
4.08±
±0.02(stat)+0.36(sys)-0.48(sys)
Rick Field - CDF/Florida
Page 4
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
σ(b-hadron)
The Tevatron Connection
August 9-10, 2004
CDF (µ
µb)
FONLL (µ
µb)
29.4±
±0.6(stat)±
±6.2(sys)
27.5+11-8.2
Rick Field - CDF/Florida
b-hadron PT
Page 5
b-Jet Cross Sections
CDF Run 2
! 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
Page 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
Page 7
b-DiJet Cross Section
CDF Run 2
Normalized to
one!
bJet-bbarJet
invariant mass
bJet-bbarJet ∆φ
! Require two secondary vertex tagged b-jets within |η
η|< 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
Page 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
σ ( D 0 , pT ≥ 5.5GeV,| Y |≤ 1) = 13.3 ± 0.2 ± 1.5µb
σ ( D *+ , pT ≥ 6GeV,| Y |≤ 1) = 5.2 ± 0.1 ± 0.8µb
σ ( D + , pT ≥ 6GeV,| Y |≤ 1) = 4.3 ± 0.1 ± 0.7 µb
σ ( Ds+ , pT ≥ 8GeV,| Y |≤ 1) = 0.75 ± 0.05 ± 0.22µb
Rick Field - CDF/Florida
Page 9
γ + 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
Page 10
γ + b/c Cross Sections
CDF Run 2
γ+b
γ+c
CDF (pb)
! PYTHIA Tune A correctly
predicts the relative amount
of u, d, s, c, b quarks within
the photon events.
ΕT(γγ) > 25 GeV
The Tevatron Connection
August 9-10, 2004
σ(b+γ)
γ)
40.6±
±19.5(stat)+7.4(sys)-7.8(sys)
σ(c+γ)
γ)
486.2±
±152.9(stat)+86.5(sys)-90.9(sys)
Rick Field - CDF/Florida
Page 11
γ + γ Cross Section
CDF Run 2
1
-1
CDF II Data (207 pb )
0.5
DIPHOX CTEQ5M µF = µR = mγ γ /2
0
30
40
50
10-1
dσ/d∆φγ γ (pb/rad)
2
dσ/dMγγ (pb/GeV/c )
ResBos CTEQ5M µF = µR = mγ γ
PYTHIA norm to data
10
γ2
EγT1 > 14 GeV, ET > 13 GeV
|ηγ1,2|<0.9
1
γ2
EγT1 > 14 GeV, ET > 13 GeV
|ηγ1,2| < 0.9
10-2
10-1
0
-1
CDF II Data (207 pb )
DIPHOX CTEQ5M µ F = µ R = mγγ/2
ResBos CTEQ5M µ F = µ R = mγ γ
PYTHIA norm to data
10
20
30
40
50
60 2
70
80
90
0.5
1
1.5
∆φγ γ (rad)
2
2.5
3
100
Mγ γ (GeV/c )
γ + γ ∆φ
γ + γ mass
! Di-Photon cross section with 207 pb-1 of Run 2 data compared with next-toleading order QCD predictions from DIPHOX and ResBos.
The Tevatron Connection
August 9-10, 2004
Rick Field - CDF/Florida
Page 12
Z-boson Cross Section
CDF Run 2
! Impressive agreement between experiment
and NNLO theory (Stirling, van Neerven)!
σ(Z)
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NNLO (pb)
254.9±
±3.3(stat)±
±4.6(sys)±
±15.2(lum)
251.3±
±5.0
Rick Field - CDF/Florida
Page 13
W-boson Cross Sections
CDF Run 2
NNLO
! Impressive agreement betweenCDF
experiment and NNLO
theory
σ(W)/σ
σ(Z)
10.92±
±0.15(stat)±
±0.14(sys)
(Stirling, van
Neerven)!
σ(W)
The Tevatron Connection
August 9-10, 2004
10.69±
±0.08
CDF (pb)
NNLO(pb)
2775±
±10(stat)±
±53(sys)±
±167(lum)
2687±
±54
Rick Field - CDF/Florida
Page 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
Page 15
W + γ Cross Sections
CDF Run 2
ET(γγ) > 7 GeV
R(lγγ) > 0.7
σ(W+γγ)*BR(W->lν
ν)
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
19.7±
±1.7(stat)±
±2.0(sys)±
±1.1(lum)
19.3±
±1.4
Rick Field - CDF/Florida
Page 16
Z + γ Cross Sections
CDF Run 2
ET(γγ) > 7 GeV
R(lγγ) > 0.7
σ(Z+γγ)*BR(Z->ll)
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
5.3±
±0.6(stat)±
±0.3(sys)±
±0.3(lum)
5.4±
±0.3
Rick Field - CDF/Florida
Page 17
Z + γ Cross Sections
CDF Run 2
Note: σ(Wγγ)/σ
σ(Zγγ) ≈ 4
while σ(W)/σ
σ(Z) ≈ 11
ET(γγ) > 7 GeV
R(lγγ) > 0.7
σ(Z+γγ)*BR(Z->ll)
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
5.3±
±0.6(stat)±
±0.3(sys)±
±0.3(lum)
5.4±
±0.3
Rick Field - CDF/Florida
Page 18
W+W Cross Section
CDF Run 2
Campbell & Ellis 1999
σ(WW) (e,µ
µ)
σ(WW) (l+track)
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
14.3+5.6(stat)-4.9(stat)±
±1.6(sys)±
±0.9(lum)
12.5±
±0.8
19.4±
±5.1(stat)±
±3.5(sys)±
±1.2(lum)
12.5±
±0.8
Rick Field - CDF/Florida
Page 19
Z+W, Z+Z Cross Sections
CDF Run 2
Upper Limit
W+Z, Z+Z
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
< 13.9 (95% CL)
5.2±
±0.4
Rick Field - CDF/Florida
Page 20
Z+W, Z+Z Cross Sections
CDF Run 2
Upper Limit
W+Z, Z+Z
The Tevatron Connection
August 9-10, 2004
CDF (pb)
NLO (pb)
< 13.9 (95% CL)
5.2±
±0.4
Rick Field - CDF/Florida
Page 21
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
Page 22
Inclusive Kt Jet Cross Section
CDF Run 2
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
Page 23
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
Page 24