Compact Muon Solenoid
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| CMS-PAS-TOP-15-018 | ||
| Template measurement of the top quark forward-backward asymmetry and anomalous chromoelectric and chromomagnetic moments in the semileptonic channel at $\sqrt{s}=$ 13 TeV | ||
| CMS Collaboration | ||
| September 2019 | ||
| Abstract: The linearized parton-level top quark forward-backward asymmetry $A^{(1)}_{\mathrm{FB}}$ and anomalous chromoelectric ($d$) and chromomagnetic ($\mu$) moments are measured in 35.9 fb$^{-1}$ of LHC proton-proton collision data collected with the CMS detector in 2016 at a center-of-mass energy 13 TeV. Candidate top quark/antiquark pair events decaying to lepton (muon or electron) plus jets final states with "resolved" (low energy) and "boosted" (high energy) topologies are selected and reconstructed using a kinematic fit of the decay products to top quark pair hypotheses. Parameters of interest are measured using binned likelihood fits to observed data of differential models based on extensions to tree-level cross sections for quark-antiquark and gluon-gluon initial states, and are determined to be $A^{(1)}_{\mathrm{FB}}=$ 0.048$^{+0.088}_{-0.084}$(stat) $\pm$ 0.028 (syst), $d=$ 0.002 $\pm$ 0.010 (stat) $^{+0.014}_{-0.019}$ (syst), and $\mu=$ -0.024 $^{+0.013}_{-0.007}$(stat) $^{+0.016}_{-0.006}$ (syst). The forward-backward asymmetry measured using this technique is directly comparable to similar quantities derived from Tevatron measurements. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 06 (2020) 146. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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