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| CMS-PAS-TOP-13-015 | ||
| Measurement of spin correlations in top pair events in the lepton+jets channel with the matrix element method at 8 TeV | ||
| CMS Collaboration | ||
| June 2015 | ||
| Abstract: The consistency of the top quark pair events produced with standard model (SM) correlated spins is tested in the muon+jets final state. The events are obtained from pp collisions at a center of mass energy of $\sqrt{s} =$ 8 TeV, corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The data agree with the SM hypothesis within 2.2$\sigma$ (standard deviation) and agree with the uncorrelated hypothesis within 2.9$\sigma$ based on a hypothesis testing procedure. In addition, using a template fit method, the fraction of events which show SM spin correlations $f$, is extracted. This fraction is measured to be $f =$ 0.72 $\pm$ 0.09 (stat) $^{+0.15}_{-0.13}$ (syst), representing the most precise measurement of this quantity in the lepton+jets channel at present. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
Public twiki page ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PLB 758 (2016) 321. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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