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Summary of W helicity results
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| Color code : | \(150~pb^{-1}\) - \(1.9~fb^{-1}\) | \(2~fb^{-1}\) - \(4~fb^{-1}\) | \(4~fb^{-1}\) - \(5.6~fb^{-1}\) | Full dataset |
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| Channel | Description (Link to web-page) | Measurement | Integrated Luminosity | Publication |
|---|---|---|---|---|
| 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 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 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 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 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 | cτtop < 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 |