Abstract
The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric
$$ \left({\hat{d}}_{\mathrm{t}}\right) $$
d
̂
t
and chromomagnetic
$$ \left({\hat{\mu}}_{\mathrm{t}}\right) $$
μ
̂
t
moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb
−1. The linearized variable
$$ {A}_{\mathrm{FB}}^{(1)} $$
A
FB
1
is used to approximate the asymmetry. Candidate
$$ \mathrm{t}\overline{\mathrm{t}} $$
t
t
¯
events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for
$$ \mathrm{t}\overline{\mathrm{t}} $$
t
t
¯
final states. The values found for the parameters are
$$ {A}_{\mathrm{FB}}^{(1)}={0.048}_{-0.087}^{+0.095}{\left(\mathrm{stat}\right)}_{-0.029}^{+0.020}\left(\mathrm{syst}\right),{\hat{\mu}}_{\mathrm{t}}=-{0.024}_{-0.009}^{+0.013}{\left(\mathrm{stat}\right)}_{-0.011}^{+0.016}\left(\mathrm{syst}\right), $$
A
FB
1
=
0.048
−
0.087
+
0.095
stat
−
0.029
+
0.020
syst
,
μ
̂
t
=
−
0.024
−
0.009
+
0.013
stat
−
0.011
+
0.016
syst
,
and a limit is placed on the magnitude of
$$ \left|{\hat{d}}_{\mathrm{t}}\right| $$
d
̂
t
< 0.03 at 95% confidence level.
