Jun 24 – 25, 2019
Prague, Czech Republic
Europe/Prague timezone

Application of the Fully Bayesian Unfolding in the top pair charge asymmetry measurement

Jun 25, 2019, 9:45 AM
Lecture room 103 (Prague, Czech Republic)

Lecture room 103

Prague, Czech Republic

Czech Technical University in Prague Břehová 7, 115 19 Prague, Czech Republic


Barbora Eckerova (Comenius University (SK))


Measurements of top quark properties provide possibilities to test the Standard Model predictions and probe BSM scenarios.
Top quark pair production charge asymmetry, $A_\textrm{C}^{t\bar{t}}$,
manifests itself as asymmetry in the differential cross section under the exchange of $t$ and $\bar{t}$ quark in the final state. In the SM, $A_\textrm{C}^{t\bar{t}}$ is zero at LO calculation and is non-zero in higher order corrections. Thus, charge asymmetry is sensitive to possible BSM contributions.

To correct for detector and reconstruction response, an unfolding procedure is applied to measured data.
Due to large amount of data collected in Run~2, systematic uncertainties have significant impact on precision of the measurement.

The technique of the Fully Bayesian Unfolding (FBU), which allows natural inclusion of systematic uncertainties via nuisance parameters, is employed. The FBU implementation is presented in the context of the Run~2 $t\bar{t}$ charge asymmetry measurement.

Primary author

Barbora Eckerova (Comenius University (SK))

Presentation materials