CDF Top Quark Physics Public Results
Conveners: David Toback, Jon Wilson Deputy Convener: Matteo Cremonesi
W Helicity fractions
W Helicity measurement
Contributions to top AFB
Linear and non-linear contributions to AFB
CDF combination of lepton AFB
CDF combination of lepton AFB measurements
Color code : \(150~pb^{-1}\) - \(1.9~fb^{-1}\) \(2~fb^{-1}\) - \(4~fb^{-1}\) \(4~fb^{-1}\) - \(5.6~fb^{-1}\) Full dataset
Channel Description (Link to web-page) Measurement Integrated Luminosity Publication
\(b\bar{b}\) Bottom-quark pair forward-backward asymmetry Consistent with SM and with some new physics models \(9.5~fb^{-1}\) 06/11/2014
Conf. Note 11092
Dilepton \(\boldsymbol{\mathsf{R = B(t \to Wb)/\sum_q B(t \to Wq)}}\) and \(\boldsymbol{\mathsf{\left|V_{tb}\right|}}\) \(R = 0.87 \pm 0.07\)
\(\left|V_{tb}\right| = 0.93 \pm 0.04\)
\(8.7~fb^{-1}\) 10/25/2013
PRL 112 221801
arXiv:1404.3392
Conf. Note 11048
Lepton+jets, Dilepton CDF Combined Lepton Asymmetry \(A_\text{FB,lep} = 0.090^{+0.028}_{-0.026}\) Up to \(9.4~fb^{-1}\) 10/25/2013
PRL 113 042001
arXiv:1404.3698
Conf. Note 11035
Dilepton Lepton Asymmetry \(A_\text{FB,lep} = 0.072 ± 0.060\) \(9.1~fb^{-1}\) 09/19/2013
PRL 113 042001
arXiv:1404.3698
Conf. Note 11035
Lepton+jets Lepton Asymmetry \(A_\text{FB,lep} = 0.094^{+0.032}_{-0.029}\), \(\left(A_\text{FB,lep} \text{(NLO)}=0.036\right)\) \(9.4~fb^{-1}\) 02/21/2013
PRD 88 072003
arXiv:1308.1120
Conf. Note 10975
Lepton+jets Measurement of dσ/dcosθ \(a_1 = 0.40 \pm 0.09 (stat) \pm 0.08 (syst)\) \(9.4~fb^{-1}\) 02/14/2013
PRL 111 182002
arXiv:1306.2357
Conf. Note 10974
Lepton+jets Top Quark Width \(\Gamma_\text{top} = 2.21^{+1.84}_{-1.11}~GeV\)
\(\Gamma_\text{top} < 6.38~GeV~\text{at 95% C.L.}\)
\(8.7~ fb^{-1}\) 11/8/2012
PRL 111 202001
arXiv:1308.4050
Conf. Note 10936

\(4.3~fb^{-1}\)
PRL 105 232003
arXiv:1008.3891

\(1~fb^{-1}\)
PRL 103 042001 arXiv:0808.2167
Lepton+jets \(\boldsymbol{\mathsf{R = B(t \to Wb)/\sum_q B(t \to Wq)}}\) and \(\boldsymbol{\mathsf{\left|V_{tb}\right|}}\) \(R = 0.94 \pm 0.09\)

\(\left|V_{tb}\right| = 0.97 \pm 0.05\) or \(\left|V_{tb}\right| > 0.89\text{ at 95% C.L.}\)
\(8.7~fb^{-1}\) 6/28/2012
PRD 87 111101
arXiv:1303.6142
Conf. Note 10887
Lepton+jets W helicity fractions from matrix element Simultaneous measurement:
\(f_0 = 0.726 \pm 0.066 (stat) \pm 0.067 (syst)\)
\(f_+ =-0.045 \pm 0.043 (stat) \pm 0.058 (syst)\)

Constrained measurement:
\(f_0 = 0.686 \pm 0.042 (stat) \pm 0.040 (syst)\)
\(f_+ =-0.025 \pm 0.024 (stat) \pm 0.040 (syst)\)
\(8.7~fb^{-1}\) 6/27/2012
PRD 87 031104(R) arXiv:1211.4523 Conf. Note 10855
Lepton+jets Charge Asymmetry \(A_{FB}\) Inclusive parton-level \(A_{FB} = 0.164 \pm 0.045 (stat+syst)\)
Compare to \(0.066 \pm 0.020\text{ from NLO SM}\)
\(9.4~fb^{-1}\) 10/31/2012
PRD 87 092002
arXiv:1211.1003
Conf Note 10807
Dilepton ttbar Spin Correlation coefficient \(-0.520 < \kappa < 0.605\text{ (68% CL)}\)
or \(\kappa = 0.042^{+0.563}_{-0.562}\)
assuming \(M_t = 172.5 GeV/c^2\)
\(5.1~fb^{-1}\) 12/06/2011
Conf. Note 10719
Lepton+jets,
Dilepton
Combined Charge Asymmetry AFB of top quark \(A_{FB} = 0.201 \pm 0.065 (stat) \pm 0.018 (syst)\)
in the ttbar rest frame, at the parton level.
up to \(5.3~fb^{-1}\) 08/10/2011
Conf. Note 10584
Dilepton W helicity, cosθ*, combining b tagged and non-b tagged samples 2-parameter fit:
\(f_0 = 0.71^{+0.18}_{-0.17} (stat) \pm 0.06 (syst)\)
\(f_+ =-0.07 \pm 0.09 (stat) \pm 0.04 (syst)\)

1-parameter fit:
\(f_0 = 0.59 \pm 0.09 (stat) \pm 0.06 (syst)\)
\(f_+ =-0.07 \pm 0.04 (stat) \pm 0.03 (syst)\)
\(f_+ < 0.07\text{ at 95% C.L.}\)
\(5.1~fb^{-1}\) 08/01/2012
PLB 722 48-54
arXiv:1205.0354
Conf. Note 10543
Lepton+jets Top Charge,
based on jet charge

Exclude top charge of -4/3 with 99% C.L.
Bayes Factor value very strongly favors SM
\(5.6~fb^{-1}\) 03/10/2011
PRD 88 032003
arXiv:1304.4141
Conf. Note 10460

\(1.5~fb^{-1}\)
08/09/2007
Conf. Note 8967
\(1~fb^{-1}\)
Conf. Note 8782
Dilepton Charge Asymmetry AFB
AFB = 0.21 ± 0.07(stat) ± 0.02(bkg-shape)
in ttbar rest frame

AFB = 0.42 ± 0.15(stat) ± 0.05(syst)
in the ttbar rest frame; in the parton level.
To be compared to AFB = 0.06 ± 0.01 from QCD.
\(5.1~fb^{-1}\) 03/01/2011
Conf. Note 10436
Dilepton W helicity cosθ* 2-parameter fit:
F0= 0.78 +0.19 -0.20 (stat) ± 0.06 (syst)
F+ = -0.12 +0.11 -0.10 (stat) ± 0.04(syst)

1-parameter fit:
F0= 0.62 ± 0.11(stat) ± 0.06(syst)
F+= -0.07 +0.06 -0.05 (stat) ± 0.03(syst)
F+ < 0.09 @ 95% C.L.
\(4.8~fb^{-1}\) 11/18/2010
Conf. Note 10333
Lepton+jets Charge Asymmetry AFB AFB = 0.150 ± 0.050(stat) ± 0.024(syst)
in ppbar rest frame

AFB = 0.158 ± 0.072(stat) ± 0.017(syst)
in ttbar rest frame


AFB = 0.475 ± 0.114 in the parton level.
Compare to AFB = 0.088 ± 0.013 from QCD.
\(5.3~fb^{-1}\) \(5.3~fb^{-1}\)
6/8/2011
PRD 83 112003

\(3.2~fb^{-1}\)
Conf. Note 9724
\(1.9~fb^{-1}\)
PRL 101 202001
Lepton+jets Measurement of dσ/Mttbar no evidence beyond the SM \(2.7~pb^{-1}\) 03//2009
PRL 102 222003
Lepton+jets Top Quark Lifetime top < 52.5 μm @ 95% C.L. \(320~pb^{-1}\) 02/14/2006
Conf. Note 8104
Dilepton, Lepton+jets, Single and double Vertex b-tags BR(t->Wb)/BR(t->Wq) 1.12 + 0.21 - 0.19 (stat) + 0.17 -0.13 (syst)
> 0.61 @ 95% C.L.
\(160~pb^{-1}\) PRL 95 102002
Lepton+jets Top Production Mechanism using low Pt Tracks 0.07± 0.14(stat)± 0.07(syst)
for xs(gg->ttbar)/xs(ppbar->ttbar)
\(1~fb^{-1}\) PRD 78 111101
Lepton+jets Top Production Mechanism using a Neural Network Fraction of ttbar events produced by gluon fusion < 0.33 at 68% CL \(1~fb^{-1}\) PRD 79 031101(R)
Lepton+jets Top Production Mechanism combination 0.07+0.15-0.07(stat+sys) \(1~fb^{-1}\) PRD 79 031101(R)
Dilepton Top Production Mechanism using Azimuthal Correlation of Charged Leptons \(Fgg = 0.53^{+0.36}_{-0.38} \left({}^{+0.35}_{-0.37} \text{(stat)} {}^{+0.07}_{-0.08} \text{(syst)}\right)\) \(2~fb^{-1}\) 7/10/2008
Conf. Note 9432
Dilepton Spin Correlations K = 0.32 + 0.55 - 0.78
-0.46 < K < 0.87 @ 68%CL
\(2.8~fb^{-1}\) 06/11/2009
Conf. Note 9824
Lepton+jets Helicity fraction and Spin Correlations Khel = 0.48 ± 0.48 (stat) ± 0.22 (syst)
f0hel = 0.74 ± 0.24 (stat) ± 0.11 (syst)

Kbeam = 0.72 ± 0.64 (stat) ± 0.26 (syst)
f0beam = 0.86 ± 0.32 (stat) ± 0.13 (syst)
\(5.3~fb^{-1}\) 07/01/2010
Conf. Note 10211
\(4.3~fb^{-1}\)
Conf. Note 10048
Lepton+jets Top Charge using Soft Lepton Tags Exclude top charge of -4/3 with 95% C.L. \(2.7~fb^{-1}\) 11/01/2010
Conf. Note 9939
Lepton+jets Charge Asymmetry AFB vs Mttbar (ppbar rest frame) Scan vs Mtt, NLO comparison \(3.2~fb^{-1}\) 07/21/2009
Conf. Note 9853
Lepton+jets Charge Asymmetry AFB (ttbar rest frame) AFB = 0.24 ± 0.13(stat) ± 0.04(syst) \(1.9~fb^{-1}\) PRL 101 202001
Lepton+jets W helicity cosθ* 1-parameter fit:
F0= 0.59 ± 0.11(stat) ± 0.04 (syst)
F+ = -0.04 ± 0.04(stat) ± 0.03(syst)
F+ < 0.07 @ 95% C.L.
2-parameter fit:
F0= 0.65 ± 0.19(stat) ± 0.03(syst)
F+= -0.03 ± 0.07(stat) ± 0.03(syst)
\(1.9~fb^{-1}\) 02/12/2007
Conf. Note 9215
Dilepton, Lepton+jets W helicity Mlb2 F+ < 0.09 @ 95% C.L. \(750~pb^{-1}\) 05/11/2006
PRL 98 072001
Lepton+jets W helicity matrix element F0= 0.88 ± 0.11(stat) ± 0.06(syst)
F+= -0.15 ± 0.07(stat) ± 0.06(syst)
\(2.7~fb^{-1}\) 10/15/2009
PRL 105, 042002
Lepton+jets W helicity matrix element 0.64 ± 0.08(stat) ± 0.07(sys) \(1.9~fb^{-1}\) 11/15/2007
Conf. Note 9144
Lepton+jets W helicity cosθ* (full reco) 1-parameter fit:
F0= 0.66 ± 0.10(stat) ± 0.06(syst)
F+= 0.01 ± 0.05(stat) ± 0.03(syst)

2-parameter fit:
F0= 0.38 ± 0.21(stat) ± 0.07(syst)
F+= 0.15 ± 0.10(stat) ± 0.04(syst)
\(1.9~fb^{-1}\) 11/29/2007
Conf. Note 9114
\(320~pb^{-1}\)
PRD 75 052001
Lepton+jets Combination of
W helicity cosθ* (full reco) and cosθ* from above
1-parameter fit:
F0 = 0.62 ± 0.11
F+ = -0.04 ± 0.05
2-parameter fit:
F0 = 0.66 ± 0.16
F+ = -0.03 ± 0.07
correlation coeff = -0.82 with no assumption
\(1.9~fb^{-1}\)
PLB 674 p160
Lepton+jets Combined W helicity cosθ* and Lepton Pt spectrum F0= 0.74 +0.22 -0.34 (stat+syst)
F+ < 0.27 @ 95% C.L.
\(160~pb^{-1}\) PRD 73 111103