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The parton-level top quark (t) forward-backward asymmetry and the anomalouschromoelectric ($\hat{d}_\mathrm{t}$) and chromomagnetic($\hat{\mu}_\mathrm{t}$) moments have been measured using LHC pp collisions ata center-of-mass energy of 13 TeV, collected in the CMS detector in a datasample corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Thelinearized variable $A_\mathrm{FB}^{(1)}$ is used to approximate the asymmetry.Candidate $\mathrm{t\bar{t}}$ events decaying to a muon or electron and jets infinal states with low and high Lorentz boosts are selected and reconstructedusing a fit of the kinematic distributions of the decay products to thoseexpected for $\mathrm{t\bar{t}}$ final states. The values found for theparameters are $A_\mathrm{FB}^{(1)} =$ 0.048 $^{+0.095}_{-0.087}$ (stat)$^{+0.020}_{-0.029}$ (syst), $\hat{\mu}_\mathrm{t} =-$ 0.024$^{+0.013}_{-0.009}$ (stat) $^{+0.016}_{-0.011}$ (syst), and a limit is placedon the magnitude of $|\hat{d}_\mathrm{t}|$ $<$ 0.03 at 95% confidence level.

the journal of high energy physics/the journal of high energy physics

Measurement of the top quark forward-backward production asymmetry and  the anomalous chromoelectric and chromomagnetic moments in pp collisions at  $\sqrt{s} =$ 13 TeV