Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at s$$ \sqrt{s} $$ = 13 TeV
Name
13130_2020_Article_13244.pdf
Size
1.26 MB
Format
Adobe PDF
Checksum (MD5)
acd7cda5e9ff2c78c886c4aca52d2228
Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Flechl, M.
Frühwirth, R.
Date Issued
June 24, 2020
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2020 Jun 24;2020(6):146
Version
Final published version
Abstract
Abstract
The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric
d
̂
t
$$ \left({\hat{d}}_{\mathrm{t}}\right) $$
and chromomagnetic
μ
̂
t
$$ \left({\hat{\mu}}_{\mathrm{t}}\right) $$
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
FB
1
$$ {A}_{\mathrm{FB}}^{(1)} $$
is used to approximate the asymmetry. Candidate
t
t
¯
$$ \mathrm{t}\overline{\mathrm{t}} $$
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
t
t
¯
$$ \mathrm{t}\overline{\mathrm{t}} $$
final states. The values found for the parameters are
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
,
$$ {A}_{\mathrm{FB}}^{(1)}={0.048}_{-0.087}^{+0.095}{\left(\mathrm{stat}\right)}_{-0.029}^{+0.020}\left(\mathrm{syst}\right),{\hat{\mu}}_{\mathrm{t}}=-{0.024}_{-0.009}^{+0.013}{\left(\mathrm{stat}\right)}_{-0.011}^{+0.016}\left(\mathrm{syst}\right), $$
and a limit is placed on the magnitude of
d
̂
t
$$ \left|{\hat{d}}_{\mathrm{t}}\right| $$
< 0.03 at 95% confidence level.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP06(2020)146
