1) University of Helsinki and Helsinki Institute of Physics
2) Academia Sinica, Taiwan
3) Institute of Experimental Physics, Slovak Academy
of Sciences
4) Fermilab
We present a top quark mass measurement in the dilepton channel using
a template method. The unconstrained system of dilepton events is solved using
the top-antitop longitudinal momentum. In this measurement, the sample is separated
into b-tagged and non-tagged samples. In 1.2 fb-1 of data, we measure the top mass
Mtop=169.7 +5.2-4.9 (stat.) ± 3.1 (syst.) GeV/c2
from the 70 events passing the event selection and the mass reconstruction.
PUBLIC NOTE
EVENT DISPLAYS
INTERNAL WEB-PAGES
ANALYSIS WITH CROSS-SECTION DEPENDENCE
Exactly the same per event mass reconstruction and templates as this analysis
send comments to authors
| Description of tables and plots | gif | eps | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| B-tagged signal templates and parametrisation functions for three top masses |
| eps | ||||||||||||||||||||||||||||
| Non-tagged signal templates and parametrisation functions for three top masses |
| eps | ||||||||||||||||||||||||||||
| Combined background template and parametrisation function |
 | eps | ||||||||||||||||||||||||||||
| Longitudinal component of ttbar momentum |
 | eps | ||||||||||||||||||||||||||||
| Reconstructed top mass versus input top mass from pseudo-experiments. The fitted line is 1.007*(Mtop-175)+175.0 |
| eps | ||||||||||||||||||||||||||||
| Residuals from pseudo-experiments. The fitted average residual is 0.004+-0.093. |
| eps | ||||||||||||||||||||||||||||
| Pull means from pseudo-experiments. The fitted average pull mean is 0.008+-0.016. |
| eps | ||||||||||||||||||||||||||||
| Pull widths from pseudo-experiments. The fitted average pull width is 1.003+-0.004. |
| eps | ||||||||||||||||||||||||||||
| Reconstructed top mass distribution from data events and parametrisation functions with measured top mass. Measured top mass from 70 data events: Mtop=169.7 +5.2-4.9 (stat.) ± 3.1 (syst.) GeV/c2 |
| eps | ||||||||||||||||||||||||||||
| Reconstructed top mass distribution from b-tagged data events. Measured top mass from 33 b-tagged events: Mtop=171.9 +7.2-6.4 (stat.) ± 3.1 (syst.) GeV/c2 |
| eps | ||||||||||||||||||||||||||||
| Reconstructed top mass distribution from non-tagged data events. Measured top mass from 39 non-tagged events: Mtop=166.0 +8.4-7.9 (stat.) ± 3.1 (syst.) GeV/c2 |
| eps | ||||||||||||||||||||||||||||
| Expected statistical error from pseudo-experiments |
| eps | ||||||||||||||||||||||||||||
| Systematic errors |
Systematic uncertainties
|