Compact Muon Solenoid
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| CMS-PAS-TOP-18-007 | ||
| Search for CP violating anomalous top quark couplings in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| September 2020 | ||
| Abstract: Results of a search for CP violation in top quark pair production are presented, using proton-proton collision data at a center-of-mass energy of $\sqrt{s}= $ 13 TeV. The data set analyzed corresponds to an integrated luminosity of 35.9 fb$^{-1}$ collected by the CMS experiment. Final states with two charged leptons are considered. In this search two observables are probed, $\mathcal{O}_{1}$ and $\mathcal{O}_{3}$, which are the Levi-Civita tensors of the four-momenta of charged leptons, jets originating from $\text{b}$ quarks, and top quarks. Asymmetries in these observables are sensitive to CP violation, and their measurement is used to determine the chromoelectric dipole moment of the top quark. The chromoelectric dipole moments derived from the measured asymmetries in $\mathcal{O}_{1}$ and $\mathcal{O}_{3}$ are 0.58 $\pm$ 0.69 (stat) $\pm$ 0.70 (syst) $ \times $ 10$^{-18}$ $g_{\text{S}} \cdot $cm and $-0.01$ $\pm$ 0.72 (stat) $\pm$ 0.58 (syst) $ \times $ 10$^{-18}$ $g_{\text{S}} \cdot$cm, respectively, with $g_\text{S}$ the strong coupling. These results are consistent with the standard model prediction. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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