Transcript 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.

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
 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
c-quark
b-quark
photon
b-jetjet
Z-boson
photon
jetW-boson
t-quark
b-quark
proton
Antiproton
W-boson
Z-boson
Charm
Top
W
b-hadron
Single
Top
W+jets
W
W
gZ
W
+TeV
g
b
++Pair
gb-jet
J/Y
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
J/Y
Page 1
Top Pair Cross Section
200 pb
CDF Run
2 Summary
-1
 Observed cross sections consistent with
each other and with the standard
model prediction (1.96 TeV, mt = 175
GeV)
 (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
t < 10.1 pb @ 95% CL
t+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/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.
m
J/y coming from b-hadrons
will be displaced from
primary vertex!
Down to
PT = 0!
J/y
m
39.7 pb-1
B
K
CDF (mb)
(J/Y,|Y(J/Y)| < 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
(b-hadron)
The Tevatron Connection
August 9-10, 2004
CDF (mb)
FONLL (mb)
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
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 6
b-DiJet Cross Section
CDF Run 2
Normalized to
one!
bJet-bbarJet Df
bJet-bbarJet
invariant mass
 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
Page 7
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
 ( D 0 , pT  5.5GeV,| Y | 1)  13.3  0.2  1.5mb
 ( D * , pT  6GeV, | Y | 1)  5.2  0.1  0.8mb
 ( D  , pT  6GeV, | Y | 1)  4.3  0.1  0.7 mb
 ( Ds , pT  8GeV, | Y | 1)  0.75  0.05  0.22mb
Rick Field - CDF/Florida
Page 8
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
Page 9
g+ b/c Cross Sections
CDF Run 2
g+b
g+c
 PYTHIA Tune A correctly
predicts the relative amount
of u, d, s, c, b quarks within
the photon events.
The Tevatron Connection
August 9-10, 2004
ET(g) > 25 GeV
CDF (pb)
(b+g)
40.619.5(stat)+7.4(sys)-7.8(sys)
(c+g)
486.2152.9(stat)+86.5(sys)-90.9(sys)
Rick Field - CDF/Florida
Page 10
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-toleading order QCD predictions from DIPHOX and ResBos.
The Tevatron Connection
August 9-10, 2004
Rick Field - CDF/Florida
Page 11
Z-boson Cross Section
CDF Run 2
 Impressive agreement between experiment
and NNLO theory (Stirling, van Neerven)!
(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 12
W-boson Cross Sections
CDF Run 2
NNLO
 Impressive agreement betweenCDF
experiment and NNLO
theory
(W)/(Z)
10.920.15(stat)0.14(sys)
(Stirling, van
Neerven)!
(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 13
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 14
W + g Cross Sections
CDF Run 2
ET(g) > 7 GeV
R(lg) > 0.7
(W+g)*BR(W->ln)
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 15
Z + g Cross Sections
CDF Run 2
Note: (Wg)/(Zg) ≈ 4
while (W)/(Z) ≈ 11
ET(g) > 7 GeV
R(lg) > 0.7
(Z+g)*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 16
W+W Cross Section
CDF Run 2
Campbell & Ellis 1999
(WW) (e,m)
(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 17
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 18
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 19
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 20