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| CMS-PAS-TOP-18-006 | ||
| Measurement of the top quark polarization and $\mathrm{t \bar t}$ spin correlations in dilepton final states at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| December 2018 | ||
| Abstract: Measurements of the top quark polarization and top quark pair ($\mathrm{t \bar t}$) spin correlations are presented using events containing two leptons produced in proton-proton collisions at a center-of-mass energy of $\sqrt{s}= $ 13 TeV. The data were recorded by the CMS experiment at the CERN LHC in 2016 and correspond to an integrated luminosity of 35.9 fb$^{-1}$. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the $\mathrm{t \bar t}$ production density matrix, is measured for the first time at $\sqrt{s}= $ 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from Monte Carlo simulations with next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD) and from NLO QCD calculations including weak and mixed QCD-weak corrections. All measurements are found to be consistent with the expectations of the standard model, and are used in a simultaneous fit to constrain the anomalous chromomagnetic dipole moment of the top quark to $-0.07 < C_\text{tG}/\Lambda^{2} < 0.16 $ TeV$^{-2}$ at 95% confidence level. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRD 100 (2019) 072002. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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